Superclass Agnatha

1
Superclass Agnatha Ostracoderms
Extinct Agnathans
- armored - small filter feeders
2
Living Agnathans
Superclass Agnatha Cyclostomes
lack of dorsal fins
Hagfish
tentacles
Lamprey
Ammocoetes lamprey larva
7 gill slits
3
Polychaete segmented worms favored by Hagfish
for dinner
4
Another polychaete
5
Superclass Gnathostomata
Class Placodermi
-boney armor -paired fins -none extant -gave
rise to Chondrichthyes?
6
Class Chondrichthyes Subclass Elasmobranchii
Sharks
Rays
naked gills
Skate
7
Class Chondrichthyes Subclass Holocephali
Rat fish (Chimera)
operculate
8
Boney Fish Osteichthyes Class Actinopterygii
Bichir
Subclass Chondrostei
Paddlefish
Sturgeon
Gar (primitive)
Subclass Neopterygii
Bowfin (advanced)
9
Osteichthyes Class Actinopterygii Subclass/Divisio
n Teleostei
10
Major evolutionary lines of fishes
Bony fishes
Cartilaginous fishes
Elasmobranchii
Holocephali
11
Cyclostomes
Elasmobranchs