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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”
JawlessJawed
“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
Conodonts
Class Myxini
Hagfishes
Hagfishes
Slime glands and slime
Hagfish Eggs
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
Jaw Evolution
First jaws
First jaws
†Class Placodermi
†Class PlacodermiAll 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
Skates and rays and sawfishes
Skates and rays and sawfishes
Skates and rays and sawfishes
Heterodontus (Port Jackson Shark)
Sharks
Sharks
Sharks
Sharks
Primitive Sharks
Cookie cutter shark
Primitive Sharks
Buoyancy
Respiration
Feeding
Spiral Valve
Plankton Feeding
Sensory Biology
ampullae de lorenzini
Reproduction
Reproduction