Vertebrata
The Fishes
Superclass Agnatha
Jawless Fishes
Superclass Agnatha
 Class
Myxini – hagfishes
 Class
Cephalaspidomorphi - lampreys
Class Cephalaspidomorphi
 Suctorial
 Nasal
mouth with horny teeth
sac not connected to pharynx
 Seven
pairs of gill pouches
 Includes
the lampreys
Life Cycle of the Sea Lamprey
Lamprey feeding
Superclass
Gnathostomata
Jawed Fishes
Types of Tail Fins among Fishes
Types of Scales among Fishes
Chondrichthyes Characteristics






Heterocercal tail
Cartilaginous skeleton
Placoid scales
Five to seven pairs of gills with separate
openings
No operculum
No swim bladder.

Includes the sharks, skates, rays, chimaeras.
External Anatomy of the Shark
Sensory Structures of the Head
Internal Anatomy of the Shark
Shark Diversity
Group Osteichthyes
Bony Fishes
Osteichthyes

Class Actinopterygii –
ray-finned fishes




Homocercal tail
Ganoid, cycloid and
ctenoid scales
Includes most bony fishes
Class Sarcopterygii –
lobe-finned fishes



Diphycercal tail
Dermal scales
Mostly extinct but includes
lungfishes and the
coelacanth
Class Actinopterygii
Ray-finned Fishes
Actinopterygii Characteristics
 Fish

primitively with fusiform body
but variously modified
 Bony
skeleton
 Single gill opening on each side covered
with operculum
 Usually swim bladder present
Anatomy of the Bony Fish