Fishes

Chapter 24

Diversity

Fossils of Early Vertebrates

Fossils of Early Vertebrates

Placoderms

Fossils of Early Vertebrates

Acanthodians

Fossils of Early Vertebrates

cartilaginous fishes: Class Chondrichthyes

Fossils of Early Vertebrates

bony fishes

ray & lobe

Agnathans

class Myxini,

the hagfishes

class Petromyzontida, the lampreys.

Class Myxini - Hagfish

Class Myxini - Hagfish

Class Myxini - Hagfish

Class Petromyzontida - Lampreys

Class Petromyzontida - Lampreys

Class Petromyzontida - Lampreys

Class Petromyzontida - Lampreys

Derived Characters of Gnathostomes

Fossil Gnathostomes

Fossil Gnathostomes

Class Chondrichthyes

Subclass Elasmobranchii

Subclass Elasmobranchii

Subclass Elasmobranchii

Subclass Elasmobranchii–

Acute Senses

Subclass Elasmobranchii

“mermaid’s purse”

Subclass Elasmobranchii

Subclass Elasmobranchii

Subclass Elasmobranchii

Subclass Elasmobranchii

Subclass Holocephali

Osteichthyes

Class Actinopterygii

Class Actinopterygii

Two main groups of ray-finned fishes. Chondrosteans

Class Actinopterygii

Neopterygians

Class Actinopterygii

Teleosts

Teleosts

Teleosts

Class Sarcopterygii

Class Sarcopterygii

Class Sarcopterygii

Locomotion in Water

Locomotion in Water

Buoyancy

Buoyancy

Buoyancy

Buoyancy: Physostomous fishes

1st method

Buoyancy: Physoclistous fishes

2nd Method

Hearing: Weberian ossicles

Respiration

Osmotic Regulation

Feeding Behavior

Feeding Behavior

Migration

Migration

Reproduction

Reproduction

Growth

Growth

French Angelfishes (Pomacanthus paru) juvenile (left) and adult (right).

Growth