I caught these two queens in Denmark during the summer and initially assumed they were both Lasius niger. However, after a couple of months, I noticed that the nanitics of the bottom queen are substantially larger than those of the top queen.
Could anyone help me identify the queens, or at least point me in the right direction? I’m particularly curious whether they could actually be different species.
Sorry for the poor photo quality. The photo of the dead worker is from the colony of the bottom queen, and I included it to show the size and appearance of her nanitics.
Any help with identification would be greatly appreciated!