Lecture 3

Question 1

Five classes of fish

Answer 1

Agnatha - no jaw 
Acanthodii ** spiny sharks 
Placodermi ** big fuckers 
Chondrichthyes - cartilaginous 
Osteichthyes - bony fish

Question 2

Agnatha characteristics

Answer 2

Oldest known vertebrates
Lacked jaws and paired appendages
Hagfish
Pteraspis

Question 3

Aconthodian characteristics

Answer 3

First fish with jaws and paired spines

Question 4

Placodermi characteristics

Answer 4

Heavily armored
Paired pectoral and pelvic fin
30 feet fucking monsters
Coccosteus

Question 5

Chondrichthyes characteristics

Answer 5

Modern day sharks, skates, Rays
Skeleton made entirely out of cartilage
Large-yolked eggs
Double nostrils - claspers on pelvic fin for getting it on

Question 6

Osteichthyes characteristics

Answer 6

Sarcopterygii- internal fin skeleton is cartilage or bone

Actinopterygii- internal fin skeleton is made of spines

Question 7

Ostracoderms vs. Cyclostomata

Answer 7

Shared:
Both lack jaws and paired appendages
Use nasal openings for smelling
Cyclostomata have 1 nostril, ostracoderms 2
Ostracoderms use pharyngeal pump to replace ciliary
Cyclostomata have Gills in pouches where filter feeding and gas exchange occurs

Question 8

Three major development of gnathostomes that set them apart form other fishes

Answer 8

Development of jaws
Paired appendages
Buoyancy mechanism

Question 9

List the major anatomical characteristics that separates sarcopterygii and from actinopterygii

Answer 9

Lobed pair fins vs Ray fins

Bone and cartilage vs spines

Question 10

Period where Paleozoic fishes first appeared

Answer 10

Devonian