Gnathostomata Flashcards
1
Q
What are two extinct clades within gnathostomata?
What are two extant clades within gnathostomata?
A
1) Placodermi
2) Acanthodii
1) Chondrichthyes (sharks, skates, rays, chimaeras)
2) Osteichthyes (bony fish)
2
Q
Shared Derived Characteristics of Gnathostomata
A
- Jaws
- Calcified teeth
- Three semicircular canals
- Ribs
- Vertebral centrum (surround notochord)
- Paired fins (supporting girdles)
- Paired olfactory structures
