Week 5 Fish origins – Fossil fishes Jawless and cartilagenous fishes.

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Presentation transcript:

Week 5 Fish origins – Fossil fishes Jawless and cartilagenous fishes

Chapter 2 - Fish Origins and Some Early History

Phylum Hemichordata Phylum Echinodermata Phylum Chordata - Origins

Pikaia – a very early (fossil) chordate

A primitive LIVING Chordate Phylum Chordata Cephalochordate or amphioxus

A primitive LIVING Chordate Phylum Chordata Cephalochordate or amphioxus

Major Groups of Fishes

“Fishes”

Phylogeny of the Vertebrates “Jawless fishes” “Jawed fishes”

Jawless Jawed

“Jawless fishes” “Bony fishes” Cartilagenous fishes Phylogeny of the Vertebrates

Jawless Bony Cartilaginous

Fishes

Trends in Fish Evolution Increased dietary niche

Trends in Fish Evolution Increased mobility

Chapter 5 – Jawless Fishes

ca. 500 mya Primitive Vertebrates Conodonts

Class Myxini Hagfishes

Slime glands and slime

Hagfish Eggs

Mxyine glutinosa L. 1 Family 6 genera ca. 40 species

Eptatretus

Eel Skin

Class Cephalaspidomorphi Lampreys

Geotria 2 familes 6 genera 41 species Lampreys

Lampetra tridentata

Lampetra similis Lampetra ayresi Lampetra richardsoni

Predaceous or parasitic life mode

Predaceous lampreys

Brook lampreys

Satellite Species Predaceous Lampetra fluviatilis Non-feeding Lampetra planeri

Great Lakes and sea lampreys

Fossil Jawless Fishes “Ostracoderms”

Fossil Jawless Fishes “Ostracoderms” All Long Extinct

Sacabambaspis Aranapsida

Pteraspidomorphi Pteraspis

Anaspidiformes Rhyncholepis

Osteostraci Ateleaspis

Chapter 6 - Fishes with Jaws Gnathostomes

Thelodonti

Jaw Evolution

First jaws

†Class Placodermi

All Long Extinct

†Class Placodermi Rhenaniformes

†Class Placodermi Antiarchiformes

†Class Placodermi

Jaws + well developed paired fins and girdles

Cartilagenous Fishes

Hydrolagus Cartilagenous Fishes Ratfish, chimaeras

Callorhinchus Cartilagenous Fishes Ratfish, chimaeras

Rhinochimaera Cartilagenous Fishes Ratfish, chimaeras

Sharks, skates and rays Cartilagenous Fishes Elasmobranchs

Skates and rays and sawfishes

Narcine (electric ray) Skates and rays and sawfishes

Heterodontus (Port Jackson Shark) Sharks

Primitive Sharks

Cookie cutter shark Primitive Sharks

Buoyancy

Respiration

Feeding

Spiral Valve

Plankton Feeding

Sensory Biology ampullae de lorenzini

Reproduction

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