VertebrataVertebrata

The FishesThe Fishes

Superclass AgnathaSuperclass Agnatha

Jawless FishesJawless Fishes

Superclass AgnathaSuperclass Agnatha

Class Myxini – hagfishesClass Myxini – hagfishes

Class Cephalaspidomorphi - lampreysClass Cephalaspidomorphi - lampreys

Class CephalaspidomorphiClass Cephalaspidomorphi

Suctorial mouth with horny teeth

Nasal sac not connected to pharynx

Seven pairs of gill pouches

Includes the lampreys

Life Cycle of the Sea LampreyLife Cycle of the Sea Lamprey

Lamprey feedingLamprey feeding

Superclass Superclass GnathostomataGnathostomata

Jawed FishesJawed Fishes

Types of Tail Fins among FishesTypes of Tail Fins among Fishes

Types of Scales among FishesTypes of Scales among Fishes

Chondrichthyes CharacteristicsChondrichthyes 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 SharkExternal Anatomy of the Shark

Sensory Structures of the HeadSensory Structures of the Head

Internal Anatomy of the SharkInternal Anatomy of the Shark

Shark DiversityShark Diversity

Group OsteichthyesGroup Osteichthyes

Bony FishesBony Fishes

OsteichthyesOsteichthyes Class Actinopterygii – ray-Class Actinopterygii – ray-

finned fishesfinned fishes Homocercal tailHomocercal tail Ganoid, cycloid and ctenoid Ganoid, cycloid and ctenoid

scalesscales Includes most bony fishesIncludes most bony fishes

Class Sarcopterygii – Class Sarcopterygii – lobe-finned fisheslobe-finned fishes

Diphycercal tailDiphycercal tail Dermal scalesDermal scales Mostly extinct but includes Mostly extinct but includes

lungfishes and the lungfishes and the coelacanthcoelacanth

Class ActinopterygiiClass Actinopterygii

Ray-finned FishesRay-finned Fishes

Actinopterygii CharacteristicsActinopterygii 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 FishAnatomy of the Bony Fish