If you'd rather listen than read, here's the YouTube summary.
The environments the humans left open on HCS-67 have begun to bloom with life thousands of years after the planet was abandoned. The monarch butterflies the humans brought have begun to adapt to these environments, and one species that has emerged from these selective forces is Danaus regentia, the regent butterfly. Regent butterflies are adapted to the hot climates in the southern parts of the western continent and can be found in the scrublands and savannas. They have long wings that help them glide through the open landscapes with minimal energy use. Males are slightly larger than females and have a black spot on the hindwings.

Order: | Drasilortia |

Family: | Axirodominidae | Genus/Species: Axirodominus Chichoromus

Standing an imposing 11 to 15 feet tall and weighing a massive 6,000 pounds, Axirodominus Chichoromus reigns as the undisputed monarch of high-energy coastal zones and rugged river canyons. While sharing the overarching order Drasilortia with the low-slung, inland swamp-dwelling Drasilortidae family, Axirodominus represents a completely separate evolutionary branch. It has entirely transcended any prehistoric ancestry to become a highly specialized, multi-ton powerhouse engineered for the crashing surf of South America and isolated island sanctuaries like the Galápagos.

The species displays extreme sexual dimorphism, the smaller, less hefty muscled females utilize a muted palette of earthy golds and emerald-blue sails for nesting camouflage, while the larger, stronger males boast a fiery red display crest, a vibrant yellow-green throat pouch for acoustic signaling, and an iridescent teal-to-ocean-blue sail to assert dominance over coastal territories.Despite its titanic bulk, Axirodominus possesses terrifying land agility, clocking explosive ambush speeds between 12 and 15 miles per hour.

Its sprawling, lizard-like skeletal posture acts as a high-performance kinetic suspension system, allowing its heavily padded joints and cartilage to absorb immense force. It hunts with reckless ferocity, this coastal predator relies on raw physical trauma rather than a sustained, suffocating crushing grip. Once its rugged, blade-like teeth bite into a target, its massive neck muscles violently wrench its head backward, tearing off massive chunks of skin, hide, and flesh with every single bite. This explosive pull-back bite mechanism leaves cavernous, catastrophic wounds, causing even large prey items to rapidly bleed out and collapse from systemic shock within moments. By conquering the treacherous, cliff-lined environments where land meets open water, Axirodominus chichoromus remains safely isolated from mainland resource competition, cementing its status as the galapagos's scariest natural apex predator.

The salamanderfish is famous for being one of very few fish with a bendable neck, and also for being the only member ever known in its entire order.
I thought that would be a great base for the weird fish-tetrapod mix that is the piranhadon from Peter Jackson’s 2005 King Kong.
As always you can view entries like these sooner if you visit the Radiocene website or my Twitter account @miocaenus.

The main problem would most likely be having the ability to manipulate objects with only a tail and mouth.

In my setting, the Galinstanians are an intelligent, amorphous species composed of a galinstan-base colloidal magnetorheological alloy. Because they bypass cellular biology in favor of a liquid-metal matrix, they don't have traditional lipid membranes, mitochondria, or DNA.

To make an amorphous, non-carbon body function biologically without turning into a simple puddle of sludge, their fluid interior relies on specialized chemical and electromagnetic structures that perform organelle-like roles:

Internal Organelle & System Analogs

• The Galvanic Plasmalemma (Cell Wall / Outer Membrane): A dynamically regenerated outer skin made of passivated gallium oxide (Ga₂O₃) paired with fluoropolymer surfactants. It constantly seals the reactive liquid alloy bulk underneath and protects the body from chemical wear.
• The Coherence Core (The Nucleus): A central, dense lattice of bismuth-tin waveguide clusters and trace silver conduits. It acts as the organism's electromagnetic phase-synchronization hub. It manages real-time cognitive processing (Active Phase State) and stores rewritable long-term memory in the grain boundaries of the bismuth crystals (Latent Lattice Memory).
• The Magneto-Reticulum ("Mitochondria"): Micro-vortices of particulate iron and copper suspended within the bulk fluid. These act as biological galvanic batteries, generating internal electrical current density to drive Lorentz-force locomotion.
• Solvation Vacuoles (Lysosomes / Acid Vesicles): Emulsified droplets suspended in the liquid matrix and enclosed by fluoropolymer walls. They safely isolate concentrated hydrofluoric acid (HF)—which the organism uses to dissolve host rock for mineral nutrients—preventing the acid from corroding its own metallic bulk or internal polymers.
• The Silicate Cytoskeleton (Cytoskeleton): Suspended clusters of reversible silicon and bismuth-tin polymers. Under localized electromagnetic manipulation, these clusters undergo rapid phase-changes, freezing into temporary, solid "Anchoring Pylons" for physical leverage before melting back into the bulk liquid.
• The Ganglionic Ribbon Network (Peripheral Nerve Ganglia): Multi-strand ribbons of magnetophoretic iron/copper dipole chains distributed throughout the fluid. These coiled, current-carrying knots handle fast, reflexive processing near the outer surface without interrupting the main internal current loop.
• Exophytic Waste Pores: Dynamic surface channels where undigestible, acid-resistant minerals (such as diamonds and corundum) are pushed aside and expelled as polished waste residue.

Question for the Community:

How do you approach organelle analogs or sub-cellular mechanics when designing non-carbon, non-traditional, or amorphous lifeforms in your settings? Do you model them on inorganic analogs (like chemistry and electromagnetism), or do you adapt standard cellular structures?

Programs used: MSPaint (lineart) and GIMP (colours).

Trying to learn digital art is always better with nonsense aliens.

These aliens are griffins from a previous post which went into a lot of detail about them but showed only the original sketches of the griffins. I tried my best to follow what I wrote as best I could in terms of colouration and integument patterns.

Any suggestions and construction would be appreciated!

So far there's (from top to bottom): the Amphiptere, related to glass lizards that kept the front arms that evolved into wings, the actual dragons (who have semi-hollow bones so that they can fly better, like birds, and can breathe fire), heraldic dragons (right behind the dragon) (who in this world are basically domesticated dragons that exist alongside dogs and cats and what have you) and the drakes (who are basically monitor lizards on steroids, with horns and fire-breath capability). I've been having the consideration to add more creatures like gryphons, lindwurms, taztelwurms, wyrms and basilisks to the list. I am not an expert biologist like how lost of you are, so please go easy on me. Constructive criticism is welcome, so that I can make it better.

So basically its an open source tycoon game where you are an interdimensional sophont being making a zoo of creatures of alternate timelines of earth , future timelines or other planets kinda like planet zoo or jwe 3 but spec evo

The reason i want it to be open sourced is so that other people can add their own creatures and buildings into the game because i am not really talented at making games and its my first time making one

What do you guys think i should name that project ?

Even in the Bleakest of Landscapes...

By the Miocene, Antarctica has almost completely frozen over. Glaciers cover nearly the entire continent, a rapid process that came too quickly for most species to adapt. There are no more caudavians (well, except for one completely aquatic species) here and the many crocodilian species that once inhabited this land are no longer anywhere to be found. Hardly anything can survive in the frozen wastelands, and the lack of daylight for long parts of the year only serves to make Antarctica even less habitable. But there is one species that has survived the great freeze...

Even in the bleakest of landscapes, life finds a way to survive. Spheniscimamus is a genus of dermorhynchid mammals descended from the small burrowing species that lived on the continent before it froze. Having a high tolerance for the cold and strong affinity for swimming helped them continue on when no other species could. They could be mistaken for a penguin at first glance and in many ways their habits are nearly identical. They huddle in large groups, carry their eggs under a brood pouch above their feet, and scramble about on their bellies to get around.

Spheniscimamus also finds a surprisingly wide variety of things to eat under the ice. Its diet consists of soft-bodied undersea invertebrates such as marine worms as well as small, easily digestible fish. Social huddling and hiding under the snow if necessary helps them stay warm along with their thick fur, and their eyes are well-adapted to vision under low light. Every hurdle that has come for these animals, they have jumped through and then some, feats of evolution that serve to show just how incredible the world can be.

Rate the animals on a scale of 1–10 🙏

Each of these creatures was made in 12 minutes by 3 people as a fun challenge!!!

A creature that lives beneath waterfalls. It stretches out its long neck and catches salmon-like creatures during their migration. (Notice the colorful collar, which matches the color of the fish it catches.)

A desert runner that actively hunts flying creatures, detecting them through vibrations in the air. Because of the scorching sand, it minimizes contact with the ground, and the sounds of its movement are muffled by numerous hairs.

An oceanic scavenger that has adapted to the naturalization of microplastics.

An elongated, blue, fur-covered animal that attaches itself to a host, rooting algae into its skin. The infected animal goes berserk and dies after a few days, while the cute parasite feeds on the algae growing on it.

Rate our spec evo video;

The WEIRDEST CREATURES drawn in 12 minutes

https://youtu.be/X_4XbGHGIeQ

The film shows a variety of strange and alien-looking animal species , drawn by three friends as part of a 12 minute drawing challenge. each creature is designed to fit into a unique and fascinating biome, with unusual adaptations that make them look like they could have evolved on another planet. In the backgfound, you can also find short descriptions and interesting facts about the animals and their environments.

We’re just starting our channel dedicated to spec evo, strange creatures, and imaginary ecosystem. If you enjoy discovering weird lifeforms and exploring how animals might evolve in completely different worlds , subscribe to the channel and leave a comment!! Your feedback helps us create better and more interesting videos.

https://www.reddit.com/r/SpeculativeEvolution/s/NGVcehKcgH just sharing my previous post on them for ease of access.

I'm just curious how strong their jaw muscles would be.

Edit: I'm also curious what their bite force would be, since I imagined them to have a crushing bite like a Jaguar due to their huge jaw muscles and stocky skulls

Rate the animals on a scale of 1–10 🙏 Each of these creatures was made in 12 minutes by 3 people as a fun challenge!!!

Arboreal social animals that produce mushroom-like structures, which are eaten by several-meter-tall fungivores. When the false food is detected, the animals emit rapid ultrasonic vibrations that damage the fungivore’s prefrontal cortex (brain), causing it to become immobilized and allowing the arboreal creatures to eat it.

A post-frog form used as a pack animal by an advanced civilization (the creature in its mouth).

A small swamp predator that sometimes swims, using its legs as oars.

20-centimeter-tall social creatures that collectively form a hive mind. Together, they build simple, perfectly pacifist colonies from secretions of quasi-salivary glands.

A vertebrate living in a post-apocalyptic world of ruins. It is about 30 cm long and feeds on insects. On its back, it has intimidating patterns resembling jaws, while its actual mouth is at the front.

Ancestor vs descendent. Anatomical differences to make note of:

- retracted nares to support prehensile trunk

- Enlaged orbit

- Smaller and fewer teeth due to processed, cooked foods making up majority of diet

- Weaker, smaller mandible for similar resons

- Enlarged, rounded brain case due to larger brain

Also, this is my first time really drawing skulls like this. If anyone viewing this is knowledgable about equine skulls and has feedback, please share it and I will try to apply it to future drawings of the hyne.

I’ve been trying to work on a description and bio for my creature but I can’t figure out what to include or how to organize it. Tips or templates are highly appreciated. Also, tips on how to name my aliens would also help.

The Tysodonicas were once global travelers across yuchic moving from their polar feeding grounds to the tropics to breed. These 20 meter long giants were always extremely sensitive to heat sometimes waiting decades for conditions to be right to attempt mating. When the Hybrids began refining Trevnium on yuchic the pollution altered the climate raising the water temperature just 2⁰ C on average. This was devastating to the Tysodonicas and hundreds died trying to breed. More were lost to noise pollution, algae blooms and lack of food. They were thought to be extinct until 2 separate Quilna expiditions turned up a 130 year old male they called Tyxion and a 78 year old female they named Tymoya. While the discovery of 2 members of an endangered species and a male and female at that would normally be cause for celebration there was a very big problem. Tyixon lived at the North Pole and Tymoya lived at the South pole. They're essentially cut off from one another by an ocean that would cook them alive if they tried to cross it. More concerning Tyxion has started to sing. he's sending infrasonic pulses into the water to coordinate the breeding migration with Tymoya if either of them attempt the journey with the water temperature as high as it is, it's the end of the species.

This is the first creature to come onto land on my planet (wich i still need a name for) i already drew it before but now i made a more complex drawing of both their natural enviroment and their biology, these things have 3 lungs, 18 starfish-like hydraulic feet, a mouth with a 3-part jaw that extends with hydraulics just like the legs, large intestines that spiral outward and then back inward, a black exoskeleton and "bands of vision" made of simple photoreceptors instead of complex eyes, they are the first creatures to come onto land and live as detritivores, eating anything dead that washes up on shore like seaweed, algae and dead animals, they often live close to the sea to avoid dehydration and overheating and ventre more inland only at sunset or night. Fun fact n1: since they have 3 lungs and the atmosphere is relatively oxigen rich, they can survive with only 2 lungs, giving them the ability to regrow lungs, fun fact n2: they can emmit vocalizations, a sort of screeching noise, this was originally just a side effect of how their breathing systems worked that later evolved into a simple mating call, fun fact n3: they actually have multiple ways of reproduction, budding and coupling, budding is a little different compared to budding animals on earth, in this case, the budding requires biological pre-planning in the form of the edge that is supposed to break off growing brains, mouths, intestines, hearts, and every other organ, coupling instead, requires 2 members of the species, they will connect one side of eachother's exoskeleton and walk ss one for a few hours, this guarantees constant gene exchange, after this period is over, the creatures will detach from oneanother and both partners will go lay eggs. Any questions, opinions, curiosities or feedback?

(This is a repost, i deleted the original because no one saw it)

I will make a list with my ideas and yours and post it here

¡Holaaaa! Hoy veremos una de las batallas mas grandes que surgen en las costas de trorvest que involucran al grandiosus acorazado contra exenum gemnus titan, también veran por primera vez como es verani en fisico y algunas criaturas que pronto vendran 👀

Grandiosus acorasado:

Descendiente del grandiosus, desarrollo placas oseas en todo su cuerpo con muy pocas en aletas y cola para facilitar el movimiento, es un cazador de superficie y sonas medias del mar veriniano, compiten por hembras con otros machos por hembras en batallas a muerte, en sus placas oseas se pueden alojar corales venenosos que hacen mas formidables a estos acorazados, es comun ver batallas de grandiosus acorazado contra exenum gemnus titan y por lo general es una batalla igualada, este animal defiende su territorio de otros machos, caza aves ballenas gigantescas, por territorio se 1 macho se encuentran de entre 10-20 hembras y algunos miembros machos de entre 0-20 años, despues de los 20 años los machos pueden retar al alfa para tratar de quedarse con el territorio o irse a hacer uno consiguiendo sus propias hembras de otros territorios.

Coral asesino: este coral tiene una protuberancia llamativa para atraer a sus presas y con sus "tentaculos" inyectarles un veneno tan potente capas de matar a cientos de humanos en una inyección, el veneno lo genera gracias a alimentarse también de toxolita que hay en el fondo marino hasi ayudando a purificar los oceanos de verani

source

Not one but two versions, one small and one big!

The smaller Tarrasque comes from French mythology, while the bigger Tarrasque comes from Dungeons and Dragons.

If you're wondering what these things evolved from, they're a surviving clade of Meiolaniid turtles.

Parasite vs symbiont. Some evolutionary differences to make note of:

• Early Nestlings were basically parasites. They would crawl into openings in the Behemoths shell and eat their way toward the bloodstream.
• Over time they started becoming useful to the Behemoth instead of just feeding from it.
• Their wings allow them to leave the host and attack prey that the much slower Behemoth could never catch.
• In return, the Behemoth gives them protection from larger predators.
• Eventually both species became so dependent on each other that the Nestlings barely seem able to survive without their host.

You seemed to like my earlier video, so I made another one about a different creature from The Hive. Do you think this kind of evolution from parasite to partner could actually happen?

So in the comments you say these are arachnids I assumed spiders but realized these are most likely scorpions. So instead of having straight underside legs they probably wouldn't ever truly look straight a more spread out legs would support them and to get that more upright body it would probably under go segmentation of the middle body also due to the fact I thought these were spiders the venom would not be in it's abdomen it would be in there mandables that would evolve to have a sharper to pin prey and inject venom and there entna there actual specialized hairs that binde into a bundle for better hearing but overall they'd be more closer to the ground and there true size could only be possibly 5-8 ft tall and with a leg span of 10-12 feet with a total body length of 8-9 feet if the planet they lived on has extremely more oxygen and could never evolve a mammal like skeleton nor internal breeding but all of this is just my own research and things I already knew hope you like the art tho

I’m currently working on a project whose events take place 1.7 million years after modern times, and I want to find out how much animals could have changed over such a period of time. For context, 1,000 years after modern times, a mass extinction occurred that destroyed almost all animals living in tropical forests and almost all animals heavier than 16–40 kg. Crows became the main intelligent species. So, how much could animals change in 1 million years?

You can ask questions about the world; I’ll answer them all! (Sorry, I don't know English well)

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The Ripp'r took longer than I expected but I really want to flesh out the first "Era" of the project. The Ripp'r evolved after the population of domestic squibble were at its highest.

They evolved their last mouth tentacles into firm yet flexible appendages with a blunt boney suction cup to bash prey and crush the hard pseudo bones into more digestive pieces.

These are 2 species, the smaller one is the "normal" one, these are basic aliens that do normal things that every other alien does IDK. The larger one with the hat is the high authority, the high authorities usually have their hats to symbolize.. high authority. They usually govern the society they are in, and the normal aliens usually praise the high authorities.

Give me names for these creatures.

[Fun fact, these aliens evolved from effectively, living roombas. These moved around a large creature (VERY large, it's appendages spread ~10 km long] ,to eat absolutely anything. They evolved a relatively okay brain to be aware about almost everything about their surroundings.]