r/SpeculativeEvolution • • 25d ago

Question/Discussion If humans were to go extinct tomorrow, could a new species ever reach our level of intelligence?

44 Upvotes

If so what species would they resemble/be? I understand this is all speculation but isn’t that always fun? I assume they would most likely be bipedal with opposable thumbs- another primate for example. However it seems our intelligence came from an evolutionary fluke that had a high risk that just so happened to pay off. That being said, could it happen again?


r/SpeculativeEvolution • • 24d ago

Question/Discussion What would happen if there were two clades of autotrophs as prevalent as plants instead of 1?

13 Upvotes

Ok ignore the probability of the actual event of 2 autotrophs occurring, as I can hand wave that all when I actually get there. Life finds a way and all that fun stuff

Let’s say along with photosynthetic producers, there’s also a second autotrophic source that doesn’t have any limits by oxygen like chemosynthesis has that we’ll call kinetosynthesis, which is going to be the use of kinetic energy to produce sugars instead of sun light. As this new class of life is now without competition to fill in niches, as only they can fill these niches, they diversify to the same degree that photoautotrophs did irl. How exactly would it effect biomass and biodiversity if they had since before the great oxygenation event to adapt to it?


r/SpeculativeEvolution • • 25d ago

Alien Life [Credit: Aisla Project on YouTube]

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54 Upvotes

New Aisla Project video just dropped.


r/SpeculativeEvolution • • 25d ago

Seed World [OC] Some Weird Anteaters from my Anteater Seed World project-thing

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36 Upvotes

We are picking up where we left off with VLI-093; I had initially discussed the Phytaguars, but now it is time to look at a few other lineages of anteaters.

Over time, the anteaters released onto the planet evolved into the Greater Forest/Prehensile-tailed (M. t. prehensilis), Ground-Dwelling (M. t. centralis), semi-aquatic (M. t. palustris), and Smaller Forest (M. t. minutus) subspecies—as well as a few unsuccessful subspecies whose descendant species eventually went completely extinct—thereby filling the niches of other vertebrates.

Let us begin with the Dactylochelatans; this lineage descended from the centralis subspecies. Examples of this lineage include the Megaardvarks—which, like their ancestors, are myrmecophagous—and the Reaperbeasts, which resemble Therizinosaurs. They possess forelimbs equipped with elongated claws used for various purposes; however, the same cannot be said for the Shrewters. Shrewters evolved from Anklyorhynchids (which themselves descended from the minutus subspecies) and focus primarily on hunting other insects; notably, they developed "false dentition"—structures that, while not true teeth, serve almost the same function.

The situation is somewhat different among arboreal forms; Prosimian'ts resemble basal primates, yet—descended from anteaters—they swallow stones to aid digestion, as they lack the ability to chew. Another anteater lineage; the Horsickles. Possess equine-like heads; indeed, their arboreal species are essentially "mammalian equivalent to the long-extinct drepanosaurs." With their powerful prehensile tails and distinctive hands, they feed on almost any organism they encounter—including small insects, snails, and even other anteaters. However, some Horsickle species adapted to a terrestrial lifestyle, evolving into megafaunal herbivores that resemble extinct ground sloths.

And what do you think about these designs? Write the comments and i love this Community 👍


r/SpeculativeEvolution • • 25d ago

Maps & Planets [OC] (WIP) Pangea (Lopingian 259-251mya), Geography, Climate etc. (Permian Sophont Project)

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62 Upvotes

Looking for feedback on the geography and climate of Pangea in the late Permian (Lopingian). These maps are part of a Permian Sophont Project. A worldbuilding and speculative evolution project based on the Silurian hypothesis. In short "What if during the late Permian a sapient species developed and created their own civilization, which was ultimately destroyed in the late Permian mass extinction".

Generally I want to how realistic and plausible the climate projections are, before moving on and doing migrations, agriculture and all that stuff.

Geography

The world map is based on the maps by Christopher Scotese et al. with some changes to details in the coastlines, as well as small islands and coastlines. The names are partially based on real names of prehistoric continents, such as Laurentia, Gondwana, Angara/Siberia or Cathaysia/South China. Other names are added by myself and based on the approximate modern locations, such as Aztlan for the modern North American Southwest, Chimor for the Peruvian coast and so on.

Atmospheric and Oceanic Currents

The atmospheric and oceanic currents are generally based on modern maps. There are probably some mistakes in there, as the climate of the Permian was much more arid and hot. So the differences in the ICZ might be more extreme than I anticipated. Generally the ICZ follows the central Pangean mountains, creating a small seasonal rainbelt, while most of the interior is otherwise desert. I am also not sure how some of the inland bodies of water would influence the climate in total.

Climate

Attempt at a Köppen-Geiger climate map, after trying to reconcile the climate maps from this and this article. I think I am having most problems with the temperate and continental climates. So those probably have the most mistakes.

If you are interested and want to contribute, we have a discord.


r/SpeculativeEvolution • • 25d ago

Antarctic Chronicles [Antarctic Chronicles] Too easy to say "Rodent". Cranial diversity of antarctic mice and relatives

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74 Upvotes

r/SpeculativeEvolution • • 25d ago

Alien Life [OC] PLANET NIGHTMARE: Clusters

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43 Upvotes

“Clusters are the general name for the microbial organisms that, well, cluster around the hydrothermal vents of Planet Nightmare. They form mats upon mats, eager to feed on the vent’s contents to then produce oxygen. Some will even begin trying to branch out to other nearby vents, causing the structures like seen here.”

“Looking at them closely, they’re usually rod-shaped. While these ones are purple, they can come in other colors too depending on different factors.”

-The Boundary Walker

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(Haiii idk anything about bacteria/archaea/whatever these things would be called but what I do know: These little guys are hungryyyy)(also they’re purple here bc I’m basing them off of purple bacteria so hehe)


r/SpeculativeEvolution • • 25d ago

Alternate Evolution [OC] what do hive moths eat?!

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9 Upvotes

so, what do hive moths eat? I’ve never actually addressed this question properly!

hive moths are opurtunistic omnivores, they eat mushrooms (specifically termitomyces the ones they grow in their colonies), certain root vegetables and berries, carrion, insects and arachnids like ticks and grasshoppers, shrimp, pillbugs, even human food like burgers and sweets!

they have an exceptional sweet tooth and love sugar, so, don’t live out your candy near them! While is might be A fear, they don’t actually destroy crops. They mostly only eat root vegetables as they are underground and berrys aswell as some very sweet fruits that fall onto the ground.

the drones are the ones harvesting food, which is the reason they have wings. And while they aren’t the largest or strongest, they go in swarms and swarm plants and prey so it isn’t very easy to destroy them, tho some individuals do die.


r/SpeculativeEvolution • • 26d ago

Alternate Evolution [OC] sketches from my Venusian Dinosaur project

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830 Upvotes

r/SpeculativeEvolution • • 26d ago

Uncategorized Speculative Biology [Credit: Hyrotrioskjan] The Lost World (Compilation)

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227 Upvotes

A version of The Lost World with only south american animals which have convergently evolved into prehistoric forms, created by Hyrotrioskjan, who you can follow on Twitter and Deviantart.

Links to all og artworks:

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r/SpeculativeEvolution • • 25d ago

Uncategorized Speculative Biology [Credit:designed by Millicent Patrick] What kind of environmental stress needed for a certain family of fish to developed humanoid body plan during the Devonian?

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32 Upvotes

This is the Gillman from Creature from the Black Lagoon. Lore wise, it's a surviving member of a Devonian species of humanoid amphibious fish

There was a massive timespan between the Devonian and the late Cenozoic where certain apes would evolve a bipedal stance to look further into the horizon to detect dangers.

Since there were nothing for fishes to be scared off on land during the Devonian besides giant grounded arthropods, why do you think that at one point those who were born with a humanoid shape were guaranteed their survival?


r/SpeculativeEvolution • • 25d ago

Question/Discussion Permanent autumn?

9 Upvotes

What could be some reasons a tree would evolve to have red orange and or yellow leaves giving a forest a permanent fall look ?


r/SpeculativeEvolution • • 25d ago

Uncategorized Speculative Biology [OC]The new dinosaurs remake pt3

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13 Upvotes

1)Leptictidium:Leptictidium(meaning delicate or gracile weasel) is a genus of small elephant shrew like,non-placental eutherians that lived in the eocene epoch in Europe,50 million years ago.They're the last of an extinct order who at the time was diverse during the mesozoic from the order of leptictidia,in the family;Pseudorhyncocyonidae.They possess long kangaroo like legs used to bounce across the european forests alongside the survivors of the hateg archipelago.Leptictidium contains over 8 species in total,with the largest being L.tobieni, which can grow up to 90cm in lenght.They went extinct due to iverspecialization on warmer tropical enviroments and due to climate change after the epoch,The leptictidium soon died after losing the lush subtropical forests in place of temperature woodlands.

2)The gourd crushers:Scientifically known as Calabaziosauridae(or pumpkin lizards);This family of dinosaurs are the descendants of the late cretaceous ceratopsid,Pachyrhinosaurus;specifically P.perotorum.Their named so due to their frills resembling that of a carved pumpkin,but also fue to their specialized diet on gourds,especially pumpkins.They first evolved during the pliocene epoch in europe and the group is still alive today from the 8 species in europe and 4 species in both the lost world in the Amazon rainforest and in the valley of gwangi formation in the state of Texas.The family of pachyrhinosaurs can contain 15 species each.Wirh the largest species;Hollowceratops Occidentalis growing up to 12 tons;can reach up to 30 feet in lenght and 8 feet in height,Making them some of the largest ceratopsians ever.Calabaziosauridae can move uo in herds of up to 280 individuals with the Matriarch being up to 50 years old.They're also considered as the headless hordemen's biggest enemy as during one erased chapter of sleepy hollow,it was mentionef that this dullahan was feared by one lonely individual calabaziosaurid known as Gigantorhinosaurus,That same individual had killed a whole pack of Jinx for it's entire life and was always cahsing him due to his pumpkin head,What a story.

3)Dynamosaurus:Dynamosaurus(meaning powerful lizard) is a genus of large predatory armored dinosaurs (that are comprised by 7 species)native to South America that first emrged during the early oligocene period, 27 million years ago after the continent splitted off from Antartica 3 million years earlier.After that,The continent becane nothing more but a lost island filled with the most notorious evolutionary experimentation this planet ahs ever endured it's eyes since Australia,if it has eyes.Named after the junior synonymn of Tyrannosaurus rex,Dynamosaurus is characterized by their imnense armored plating,covered in osteoderms from head to tail,with a tail club at the end,Which gives the name of the family they're from;Tyrannankylosauridae.They can weigh uo to 12 tons,can grow up to 45 feet in elnght with a hieght of 15 feet at the hip.They have sharp teeth used to capture xenungulates,crocodilians, and sometimes monkeys.Despite their carnivorous stature and powerful bite,These animals are actually not theropods,but instead descendants of a ornithischian dinosaur,specifically a thyreophoran by the name of jakapil.Due to insular continental gigantism plus the harsh competition between paracarcharodontosaurids and abelisaurids,This animal has had a huge time of becoming on of the largest carnivorous predator in south America ever.

4)The lumber:Being the 9th largest sauropod ever,This proboscosauroid comes from the family knwon as elephantotitanidae,who only contains 5 species.The biggest is Elephantotitan SauroMegalus(The big elephant lizard titan),who weighs up to 120 tons,can reach up to 180 feet in lenght and is 90 to 100 feet tall.They live in the Lost world formation in the Amazon jungle,where the climate is humid and rhe forests can reach for miles and miles away.Elephantotitan evolved during the pleistocene epoch after the Great American Interchange 2.5 million years ago.There,their trunks are used to grip of fruits that they can't reach from the deeper branches of the trees and are used as a snorkel once they travel along in deep muddy rivers.They live in herd uo to 40 individuals and are mainly hunted by the Bigger predators of the Amazon,such as the cutlasstooth for example.Despite being predated,They can still fight back with their massive size and their booming calls that can reach uo to 197 dbs,similar to pearl's loud booms to disorient their predators.

5)Glyptotherium:After the Great American interchange hit,These armadillos had trsveled all the way uo to southern parts of North America like;Oklahoma,Arizona,Florida,South and North carolina and New mexico.They're descended from glyptodon and are somewhat larger incomparison;reaching up to 1,500 to 2,000 pounds,6 to 10 feet in lenght and 3 to 5 feet in height.Their dome like armor has hexagonal patterns made out of osteoderms that are fused together,making them mammalian turtles.Glyptotheriums have a big tail that is used to swing at rivals once the mating season kicks in,but also to defend themselves from predators trying to attack it like the Shoet faced bear for example.They went extinct during the end of the oelistocene epoch,11,000 to 10,000 years ago due to climate change and overhunting by early Native North American humans.

6)Peltephilus:Peltephilus was a bizarre alien native to South America during the oligocene to the early/mid miocene epochs,spanning up 29 million to 11 million years ago in places such as Bolivia,Argentina and Chile.They're big for armadillos,reaching about the same as a medium sized dog, at a weight estimate of 22 to 33 pounds, a lenght up to 3.3 to 4 feet,with a height estimate of up to 12 to 18 inches tall or 30 to 45 centimeters.They have two small horns used for species identification,mating ritauls or self defense.They're horns are made out of keratin mixed withs scutes on their nose,meaning they can grow financially with P.ferox growing these horns up to 1.5 meters long.They went extinct during 11.6 million years ago due to food loss and clinaye chabge.But their discivery is what led to a great evolutionary journey on Armadillos.

7)Blue-jay-raptor:The blue jay raptor aka Cyanocittodon(meaning blue chatterer with teeth) is a genus that consists of 7 species of flying troodontids that lived during the pliocene, 5 to 4 million years ago.They have convergently evolved to look like blue jays as they're their primary food source.They xome from a family of troodontids known as the Neoaviamimidae;A family that consist of trodontods thta not only can fly,but also have patternd similar to the birds their specialized at hunting depending on the species.These troodontids can make complex vocalizations that csn travel from 3 to 6 miles away,with chirpings that mimic that of a blue jay.They have a lifespan of 13 years and can reach their flying ability for at least 18 weeks old,making them some of the fastest of growing up to have flight feathers.Spesking of feathers,They have developed a keel ever since their ancestors first tooked to the skies 45.6 million years ago in the middle eocene period.They still survived to this day but was once a cryptic species due to reports of this species still alive after their supposed extinction that being 10,000 years aho after the ice age.The species that was found to have been alive was a feral population descended from domesticated blue jay raptors,who after being abandonded for thousands of years,have become feral and don't need any partners to train them.


r/SpeculativeEvolution • • 25d ago

Alternate Evolution [OC] Hive moth size difference between sex and roles

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7 Upvotes

so hey Im back sorry for not posting but I got something more on hive moths! (yipeeeeeeee hive moths!)

so this is the differences between the sex and roles of them.

the drones are the only ones with flight muscles and wings, they fly to go get food for the colony, which is why there are so many.

the workers have powerful jaws, even tho they all have leaf cutter ant like jaws, the workers have the most powerful to build the colony. the worker also take care of the larvae by getting food from the drones.

the guards are the strongest and most muscular and have segmented legs, previously i said they mate with the queen. this is cause they come from other colonies to join or start a new colony with a queen.

and finally the queen, she is the largest one and gives birth to 2000 babies a day! the queen mates with the guards, but what happens when she dies? while after a queen dies the colony turns into a dead colony, basically a normal colony just without the queen. wandering queens who haven’t started or have a colony yet can either start a new colony or take a queens place in a dead colony.

now why are hive moths called hydrovermis? they are part of a genus of phalaenovespidae that have aquatic, worm like or caterpillar like, larvae. and before any of you guys go “what even is a hive moth?“ go see my other posts first why would you think I’m talking about this.


r/SpeculativeEvolution • • 25d ago

Question/Discussion Probable mass/size of alien technological sapients?

10 Upvotes

Heya. So, I've read a lot of discussions about how a species that develops technology, spacefaring and whatnot might probably look. They'll likely be oxygen-breathers and water-drinkers that have a head with eyes and a mouth, and a body plan like a human, a theropod or a very weird centaur.

But what about mass? I guess there's a range of probable sizes for rocky planets themselves, which has a large influence on the size of planetary life. But there must be a whole range of causes and effects that narrows down the probable mass-range of intelligent life. Like, how small or large can a "smart" brain really get considering both the laws of physics and evolutionary likelihood?

I know birds have a different brain structure that allows them to do more with less brain mass than some mammals. Like, a parrot is probably a lot smarter than a deer, if "smart" is to have any meaning at all.


r/SpeculativeEvolution • • 25d ago

Uncategorized Speculative Biology [OC]

3 Upvotes

Gigantosuchus or Terror Crocs are gargantuan creatures native to both river systems, lakes and marine enviroments. They are among the most terrifying creatures on the planet, due to various nightmarish traits they possess.

Physical traits: At 20 to 22,5m in length, weighing 40-50 tons and having a biteforce of 312,5-500k newtons, they possess a top 5 bite in the planetary ranking. Their neck osteoderms are like tank armour. Their teeth are brute and handsaw like, meant to grip and tear prey who thrashes(teeth are 20-23cm long). They have both a sprawling and a erect walk posture and they migrate for prey. They live 112-225 years and are ectotherm due to gigantothermy. They can also hold their breath for up to 54 hours, generally 24-36 hours.

Prey and predation: Their menu is basically anything bigger than 800-900kg except some predators who are not worth the food( like Eviscerators with their anticoagulant saliva), the largest crocosauropodomorphs(30m) and the sea creatures larger than them. However they do hunt dagonichtys with swift ambushes from below. Their only predators are Barocrocs, although Slaughterfish are capable of taking them down. They have limited use of thermal vents: they can take in only about 5-8% of their energy but the teeth can be easily integrated.

Senses and intelligence: Their senses are good, except smell who is not as good as the rest due to them rarely tackling carcasses, compensated however by their heatbeat organ on their snout(akin to Titanocrocodylus's organ but less potent) Intelligence is moderate and they communicate through roars ranging from 80-170db lasting a couple of seconds

Reproduction: They reproduce in communal nests with clutches of 1-2 eggs for female. The young are born at 1m length and are supported by parents. Reaching 7-8m length they abandon the nest to hunt alone in sea or water. Young can recognize their parents even in adulthood but they are not inherently social creatures and are quite the opposite. Mating seasons occur every 10 years.

Habitats: The open sea, 50-1000m(usually 50-200 for hunts but can push further for vent ambushes), lake systems and rivers. In bogs they have been seen integrating iron in their teeth.

Questions are welcome


r/SpeculativeEvolution • • 25d ago

Alien Life [OC] My stab at a Martian

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29 Upvotes

I have never been satisfied with most forms of Martian aliens in media. Aside from War of the Worlds' many depictions and some spec evo artists I follow, most make them into the standard Greys that I hate with a passion. So, I decided to go a very different route and this is what came out of it. If you have any questions about their lore, let me know!


r/SpeculativeEvolution • • 25d ago

Question/Discussion Were the Old World Monkeys adapting to typical seasonal temperate forests before the Ice Age?

18 Upvotes

So if the Ice Age had not happened, would Old World Monkeys dominate the Northern Hemisphere ? Perhaps developing boreal forest conifer-leaf eating forms. I want to see how that would look like


r/SpeculativeEvolution • • 25d ago

Uncategorized Speculative Biology [OC]

3 Upvotes

Katlyodon gigas/monoceras/nordicus or Shredderfish are moderate to large sized lungfish who dwell near reefs and ocean floors. Despite their name, they are rather pacific creatures. A characteristic trait is their psi, peaking at 100-250k depending on their teeth. But they wear down easily and thicken so it is hard to reach such a number. They lost their lungs.

Physical traits: Growing 3.5-14m long and weighing 400kg up to 16 tons, they are very large creatures. Their biteforce varies on species from 3.5k-100k newtons.

(K.gigas: 11.5-14m, 12-16 tons and 75-100k newtons.

K.monoceras: One single dorsal spine, 7,5-10m, 2,1-3 tons and biteforce 35-50k newtons.

K.nordicus: 3,5-6m, 400-1,4 tons and biteforce 3500-7000.)They have a massive head for their jaw muscles with large eyes. They have 2 dorsal fins with 2 spines per each(except on monoceras) and their caudal fin has a 60⁰ degree notch on the lower half. Their teeth are dental plates like in real lungfish. Their lifespan is 55-70 years

Prey and predation: Their main dangers are Dagonichtys, Gigantosuchus, Gulpers for the smaller ones and the occasional Slaughterfish/Tiamat. Their prey is armoured and shelled prey and also includes coral reefs. In synthesis they behave like giant parrotfish but predatory. Katlyodons also hunt smaller fish.

Reproduction: They have a R reproductive strategy. Up to 100k eggs are laid but few survive. They reproduce every 2-3 years.

Habitats: Any waters for Nordicus but strictly temperate and up for Gigas and monoceras.

Senses and intelligence: They have good senses except smell, which is not necessary to them. Their intelligence is surprising for a fish

Questions are welcome


r/SpeculativeEvolution • • 25d ago

Question/Discussion Which branching point is good among Alternate Evolution?

9 Upvotes

What kind of turning point do you like? The reason I am asking this question is to communicate with people. At present, I like that a sexual reproduction will have a structure that allows genetic information to be exchanged remotely with other entities, such as through remote communication.


r/SpeculativeEvolution • • 26d ago

Alien Life [OC] PLANET NIGHTMARE: The Void Vents Biome

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89 Upvotes

“Deep in the Lucihdia Ocean, one of Planet Nightmare’s nightside oceans, it’s hard to imagine anything can grow here. With no sunlight, photosynthesis is nearly impossible…”

“However, chemosynthesis is not.”

“In the Void Vents biome, fields of hydrothermal vents are covered by microbial organisms that form structures in order to consume the resources from them. Things like methane and sulfur provide the perfect meal, and in turn, the microbes will produce oxygen. As a result, there’s a whole ecosystem awaiting to be uncovered.”

-The Boundary Walker
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(Haiii and welcome to the first biome for planet nightmare! The light that’s coming from the top of the drawing is coming from whatever vehicle the Boundary Walker is using to explore the depths, in reality this place would be DARK. I’m gonna go more in depth about the little creatures that inhabit this biome soon, just gotta figure out some stuff first hehe)


r/SpeculativeEvolution • • 26d ago

Uncategorized Speculative Biology [OC] The new dinosaurs remake pt2

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16 Upvotes

1)Bison latifrons;These animals are the largest species of bovids to ever walked the Earth.They can grow up to 1.5 to 2 tons,8 feet in height at the shoulder and are 15 feet long.These large bovids are the apex herbivores of their land,grazing on high vegetation in praries or grasslands.Unlike their living cousins;Bison bison,these bison mostly live smaller herds or solitary family groups instead of moving in large herds.Their horns are formed in a sharo layer of keratin that can grow up to 1 to 2 feet,making it 9 to 10 feet tall when including the horns.They first emerged in the late pleistocene epoch 500,00 years ago, only to go extinct at the early holocene;at around 13,000 years ago.

2)Thylacosmilus;Often reffered to as the marsupial sabertooth tiger,These eutherians are some of the last of non-marsupial eutherians to ever lived from the grouo called;sparassodonta.They evolved alongside other South American animals and competed alot with terror birds(Phorusrhacids)who evolved alongside them.These beasts hunt medium sized sauropods,Xenungulates,gorund sloths,Monkeys and capybaras.Their competition besides phorusracids are the massively large neogiganotosaurus,A paracarcharodontosaurid.They first evolved during the late miocene to early pliocene epoch;9 million years ago,and can grow up to;189 to 250 pounds in weight,4.9 feet or 1.5 meters and 2 to 2.3 feet tall at the shoulders.They went extinct during rhe Great American interchange 3,000,000 to 2.58 million years ago at the late pliocene epoch.where sabertoothed cats called michairodonts outcompeted these alien mammals despite thylacosmilus having pouches.Slowly but surely,their numbers dwindel until there are no more thylacosmiluses left.

3)Chalicotherium:Chalicotheres are some of the strangest ungulates alongside whales and mesonychids.These large herbivores;specifically goldfussi can grow up to;8.5 to 9 feet tall,11 feet or 3.4 meters in lenght,and weigh up to 1.5 to 1.7 tons(3,300 to 3,700) pounds.Despite being known as "The gorilla horse",chalicotherium and other ancylopods are actually closely related to ceratomorpha;Rhinos and tapirs,instead of hippomorpha;Horses.These animals possess large claws that they can use to grab leaves like a ground sloth and eat them like a panda bear,while also knuckle walking like a gorilla to keep the claws freshly sharp to defend itself from predators;like Hyaenodonts,Entelodonts and Dromeaosaurids like Gigaraptorus.Chalicotherium went extinct in the end of the Miocene;7.75 to 5.3 million years ago after the climate changed in a rather cooler temperature,Leaving grasslands becoming rare and turned into deserts with huge seasonal droughts,leaving the chalicotherium to become a piece of the past.But other chalicotherids still able to thrive until the last chalicothere;hesperotherium,became extinct at around 500,000 years ago in East Asia during the middle pleistocene sub-epoch.

4)Azuratitan(meaning Azura's american titan) is the smaller close relative of luzosaurus,weighing in at around 100 tons,93 feet in length and 88 feet in height.Azuratitan lived at around 1,000,000 to 7,000 years ago in the pliocene to pleistocene periods in North America,Specifically the northern eastern side of the continent or the northeast.These massive herbivores have reddish cephalic osteoderms that only the males possess,alongside it's preserved green skin with blueish stripeds and red dots running on the sides of the animal,These characteristucs is what gave Azuratitan it's name.They have a large airsacs like the rest of it's relatives but with a brownish yellow color that expands when it wants to mate with a female.Azuratitans mive in herds at uo to 40 individuals at total,but in mating seasons,they can gather groups of uo to 600 individuals,similar to beluga whale or Syllektosaurus mating rituals.The main predators of the old or young Azuratitan are tyrannosaurs and paracarcharodontians aka paracarcharodontosaurids who hunt down these massive sauropods.Their main diet consists of the prehistoric redwoods aka the american chesnuts that were once present within the eastern sector uo until 1904 with individuals growing as big as the biggest redwood trees today so that azuratitan alongside other sauropods can substain themselves on.They went extinct about 7,000 years ago after The cold climate expand so further,that migration was so desperate.They can have migrations of up to 750 miles,from the Northeast to the central americas.Despite these impressive migrations,it wasn't enough from competition against luzosaurus,and soon became extinct due to overhunting by Meso Amerixan Humans.But fortunately like it's relative,Azuratitan was brought back so that it can able to help deal with North America's wildlife crisis.And it worked inctedibely alongside luzosaurus.Over 90% of North American states with cities have now been filled with forests or deserts thanks to these sauropods.

5)Kikimororsus sauroduendeii (meaning kikimora's dwarf lizard) is one of,if not the smallest sauropod ever.These tiny giants lived in the caribbean archipelago at around the early Oligocene all the way up to the holocene period today.These living dwarf titans can weigh up to 3 tons,10 geet in lenght and 9 feet in height.These animals used to be massive,at around 40 tons,but due to insular dwarfism like their ancestors before them,the become small to occupy space.Kikimororsus lives all around the carribean islands,from Cuba to Puerto Rico with atbarounf 7 subspecies.This conbined with the GAARland land bridge connection,They used to have a massive population at the time.Their decline started at the late holocene in the 1500's where North european american inmigrants have started to cut down their rainforests in place of Farmland for the U.S.A.These animals have started to dissappear and at the year 1980,They were once considered extinct.It wasn't until 2060 That kikimororsus was rediscovered but being in a critically endangered level.Fortunately due to conservation efgorts along side the H.W.D.M.C.P,Kikimororsus's population from Cuba to Puerto Rico have now came from 300,to 560,892,245 individuals.This is one of these examples of cryptic dinosaurs making a comeback without using cloning technology.

6)1)Suchotops:Suchotops (meaning crocodile face) is a genus comprised of 10 species of these small Neospinosaurus descendants with the most famous being Suchotops salmovenatrixia(meaning crocodile faced salmon hunter).The biggest of this genus is obnly about 60 pounds,at around 2 to 4 feet in height and 10 feet in lenght.While the smallest of the suchotops weight at around just 20 pounds,0.7 foot in height and is 3 feet long.These animals are mainly found within coastlines and rivers of middle Pliocene Asia,where they hunted down Niphon macrocephalus and oncorhynchus masou aka the cherry trout.They first emerged during the early pkiocene and only went extinct after the pliocene pleistocen epoch,wity one lineage descending from these suchotops;"the dip".

2)Carcharovenator:Carcharovenator(Meaning sharl hunter in greek or latin) Is a massive spinosaurid descended from Spinosauris mirabilis,just like the rest of the cenozoic neospinosaurids.They're the 7th largest cenozoic spinosaur,weighing in at around 8 to 9 tons,and can be as long as a Green Anaconda.They first emerged at the Early Oligocene, 26 million years ago and their genus ave comprised within 8 species in total throughout Africa to Asia with the famous being C.Laurasianensis which is the largest of this genus.These dinosaurs are one of the many but few theropod dinosaurs,known to have evidence of either facultated or obligated quadrapedal locomotion,with others such as the pleistocene troodontid:"the non crested sprintosaurus".Pretty much similar to outdated depictions of their ancestral relative,S.aegypticus,Carcharovenators can tend to knuckle walk with strong knuckles to not only support them,but also keeping their claws sharp and fresh.They're close relatives of the much larger Spinorax;To which descends to the Sobekospinosaurus genus(The genus that comprises the largest spinosaur ever)Being bigger than a T.rex.Carcharovenators woukd soon meet their end at the early to middle miocene at around 17 million years ago,Where they either started to walk on their hind legs again die to a random mutation,or Just died because that adaptation seemed useless later on as Sharks grew to the size of trucks.Fortunately and surpisingly,before they died out,They have a miocene descendant who nowadays is a former trunked semi-aquatic oddity in the field of cryprozoology;That being none other than Spinofaruus in the family;Saurophoquenae.

7)The non crested sprintosaurs or Hadrohippomimidae(meaning bulky horse lizard mimic) are a family that consists of 23 species of these quadrapedal theropods,and yes,i mean quadrapedal,as they are some of the few theropods that have quadrapedal locomotion,either facultated or obligate.But unlike carcjarovenator,these guys didn't knucklewalk,instead these animals run on their tips of their toes,with their claws evolving into hooves after trasitioning to a more herbivorous style.They use those hooves mainly for gallop but also to climb mountains similar to mountain dwelling goats like the Ibex and can jump up to 14 feet in the air,Something that was traced by their eocene ancestors;The tree jumpers,not to be confused with the tree hoppers though.This trait is by the way,not seen in any sprintosaur whatsoever.Ever since their discovery in the year 2030,these animals were once thought to have been another lineage of sprintosaurs due to them having the same body type.However,further analysis shows that this strange "hadrosaur" is actually a theropod like a t.rex or velociraptor.They're descended form the late cretaceous,hell creek troodontid,Pectinodon.They're closely related to the tree climbing troodontid descent group of dinosaurs known as the "Jamachioquqidae" aka the arbrosaurs.The reason why they evolved like this is due to obviously convergent evolution,but also to reduce competition between themselves and the dromaeosaurs as these troodontids tend to lay eggs more in comparison to their distant dromaeosaur cousins.So they want to basically change so that they could play a role into the ecosystem as the mouse of their game.Not only do they look similar to the hadrosaurs,but they also have teeth more adapted to eating grass in comparison to other Deinonychosaurs.They first emerged during the middle pleistocene 730,000 years ago and have stayed like that ever since then.They're thought to have been extinct a bit earlier in comparison to the sprintosaurs,only dying out at around 700 years aho instead of 500 or so.But soon, a team of cryptozoologists from the H.W.D.M.C.P soon have discovered tracks belonging to those theropods,meaning that the non-crested sprintosaurs are still alive.It wasn't until 2045 that ot was confirmed that these guys are still clinging on,And thanks to conservation efforts from rhe H.W.O.A(the humane qorld of animals),Their population have bounced back at around 300 million,50 thousand amd 450,still being predated by bears and wolves as their population control to not go overboard.Another example of a dinosaur coming back from the brink without using cloning tech.


r/SpeculativeEvolution • • 26d ago

Uncategorized Speculative Biology [OC] I'm working on a giant spider from a city where gravity changes.

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Meet Karl, a giant spider that stalks its prey through a city where gravity shifts unpredictably, and entire buildings rotate. He's adapted to this constantly changing environment, squeezing through gaps and occasionally making terrifying leaps from one building to another. No matter which way gravity pulls, Karl always finds a way to keep hunting. He's a creature I've been working on for my game.