Phylum Chordata

Question 1

5 characteristics of chordates
may only occur in larval stage

Answer 1

a notorchord, a dorsal hollow nerve cord, an endostyle or thyroid, pharyngeal slits, a post anal tail

Question 2

Subphylum Urochordata

Answer 2

tunicate adult and larva

Question 3

Subphylum Cephalochordata

Answer 3

amphioxus (lancelet) both whole mount and cross-section
- identify pharyngeal gill slits, dorsal nerve cord, notochord

Question 4

Subphylum Vertebrata

Answer 4

Superclass Agnatha (jawless fish)
1. Class Petromyzontida (lampreys)
2. Class Myxini (hagfishes)

Question 5

Superclass Gnathostomata (jawed vertebrates)

Answer 5

Class Chondrichthyes (sharks, skates, rays)
2. Class Actinopterygii (bony fish)- perch dissection
3. Class Amphibia (frogs, salamanders, toads)
4. Class Reptilia (lizards, snakes, turtles, crocodilians) – Key out Snakes
5. Class Aves (birds)
6. Class Mammalia (mammals) – Key out Skulls