Bannykus vs Ambopteryx
Bannykus (left) or Ambopteryx (right)?
Bannykus
Ambopteryx
Factfiles:
Bannykus wulatensis
Artwork by @i-draws-dinosaurs, written by @i-draws-dinosaurs
Name meaning: Half claw from Wulatehouqi
Time: 113 to 100 million years ago (Albian stage of the Early Cretaceous)
Location: Bayin-Gobi Formation, Inner Mongolia, China
If there’s one group of dinosaurs that has most recently gained more fame among casual dinosaur fans it’s probably alvarezsauridae, elevated to stardom by the Mononykus that captured everyone’s hearts in Prehistoric Planet. The bizarre group of single-clawed maniraptorans has been studied for a while, but their evolutionary origins have fairly mysterious until recently. How did that whole giant thumb claw thing happen??
Published in 2018 alongside more basal alvarezsaur Xiyunykus, Bannykus helps to fill in a gap in that evolutionary pathway! More specifically, they help to fill in a 70 million year long gap between the primitive Late Jurassic Haplocheirus and the very end of the Cretaceous! Notably, Bannykus has a larger thumb claw that the rest of its claws, but the other fingers are at least partially functional instead of just nubbins. It’s a lot easier to see how the later alvarezsaurids got to where they are from here! Next time you lose your mind over the Mononykus from Prehistoric Planet (which I do at least weekly), say a thank you to the lil guy with slightly less weird hands. Thumbs up to Bannykus!
Ambopteryx longibrachium
Artwork by Gabriel Ugueto, written by @i-draws-dinosaurs
Name meaning: Both wings with long arms
Time: 163 million years ago (Callovian stage of the Middle Jurassic)
Location: Haifanggou Formation, China
Look, evolution has done a lot of weird stuff to dinosaurs. It put penguins underwater, and did whatever the hall mamenchisaurid necks are, and game lambeosaurs a built-in face trumpet. But I would argue there is one group that represents dinosaur evolution at its most unhinged, and that is scansoropterygidae.
Scansoriopterygids were generally considered “weird little tree dinosaurs” in the 2000s, with long fingers to pick grubs out of bark or something. Then Yi qi swept along in 2015 and revealed that those long fingers were actually supporting membranous bat wings. With an extra bony rod (the “styliform element”) sticking out of the wrist to help support it, because well if you’re a dinosaur evolving bat wings why bother being normal about it after that? Although really, the dinosaurs did it first so bats actually have dinosaur wings.
Yi was sensational, but it was also extremely weird and completely unique. Even other scansoriopterygids didn’t have wing membranes, so the whole bat thing was a bit up in the air. Or not up in the air, as the case may be. But then along comes Ambopteryx, published in 2019, packing another set of skin wings, and the vindication of Yi is complete!
Ambopteryx preserves a styliform element and wing membrane, as well as a thick coat of feathers, and honestly out of a whole selection of dinosaurs I think these might be some of the most huggable in the lot. Obviously this whole wing membrane thing didn’t end up working out for them long term, but Ambopteryx is part of an incredible lineage that challenged what we thought was possible for dinosaurs!
DMM Round One Masterpost
