Vertebrata The Fishes.

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Presentation transcript:

Vertebrata The Fishes

Superclass Agnatha Jawless Fishes

Superclass Agnatha Class Myxini – hagfishes Class Cephalaspidomorphi - lampreys

Class 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 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