Thread:Dinoman972/@comment-25175729-20180614202045/@comment-24941009-20180615163614

Disgustedorite wrote: If you think dinosaurs are only joined by morphology they share with pterosaurs, you are very very wrong at the highest level. The only similarities they share are ones they also share with mammals--that is, that they are warm-blooded 4-limbed chordates with their legs under them which often have fluff. By your logic, dinosaurs, pterosaurs, mammals, and birds should all be placed under a new taxon, "flufferia".

Everything I saw in Cogoingrediae has an exoskeleton. There is a large distinction between a creature with skin-based wings on a scaly lizard body and a straight-up arthropod with a lizard head. I meant they share some traits, but not that they're defined by them. They also have many differences, but Dinosauria is a very diverse class anyways. Also, they share more similarities: some pterosaurs have beaks like birds (which are actual dinosaurs) and many dinosaurs, such as ceratopsids and ovirraptorids.

Also, just because all members in a taxon share one feature doesn't mean a new member can't lack it (in fact, there is one creature in Cogoingrediae that lacks exoskeleton indeed: the ). Plus, the description for Hemiinsecta states that most members have an exoskeleton, but not all of them, so it's not a very strict criteria.