Crown Archosauria

Question 1

Crown Archosauria is defined by the split between

Answer 1

Ave and Crocodylia

Question 2

Stem Archosauria

Answer 2

Protorosauria, Tanystropheidae, Rhynchosauria, Prolacteria, Euparkeria

Question 3

Crown Crocodylia

Answer 3

Alligatoridae
- Ornithosuchia (bird croc), aetosauria, poposauridae, rauischia, crocolyomorpha

Question 4

Crown Aves

Answer 4

10000 species with every conceivable ecology
basal radiation

Question 5

Bird basal radiation

Answer 5

Paleognathidae (flightless birds), Neognathidae (chicken, nesting birds), Neoaves (everything else)

Question 6

Stem Birds

Answer 6

Pterosaurs
- elongated digits
Dinosauria (not crown clade!)