Presentation 4: Agnatha

Question 1

Agnatha

Answer 1

(no jaws) paraphyletic group with 2 monophyletic groups, Petromyzontidae and Mixinoidea

Question 2

Petromyzontidae

Answer 2

lampreys, slightly paracitic with oral disk and keratanized teeth, photoreceptors, anal tube, divided brain, notochord, gill slits

Question 3

Ammocoetes

Answer 3

Larva of lampreys, look like amphioxus (aka lancelets)

Question 4

Myxinoidea

Answer 4

aka hag fish, no oral disk or keratinized teeth aside from single took to attach to prey