Invertebrates Octopus Video. Phylum Chordata C. Vertebrata Share four chordate characteristics + vertebral column (spine, backbone) Spine encloses and.

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Invertebrates Octopus Video

Phylum Chordata C. Vertebrata Share four chordate characteristics + vertebral column (spine, backbone) Spine encloses and protects nerve cord (spinal cord) Anterior end of spinal cord = brain protected by skull made of bone or cartilage 1. Fishes Oldest group of vertebrates (530 mya ) 27,000+ species (15,600+ marine spp.) Three major groups

Fishes

A.Class Agnatha – Jawless fish No jaws Unpaired fins and no scales 1.Hagfishes

Fishes A.Class Agnatha – Jawless fish 1.Hagfishes

Fishes A.Class Agnatha – Jawless fish 2.Lampreys

Fishes B.Class Chondrichthyes – Cartilaginous Fishes Includes sharks, rays, skates and ratfish Cartilage skeleton Movable jaws Paired and Unpaired fins Placoid scales

Fishes B.Class Chondrichthyes – Cartilaginous Fishes 1.Sharks Fusiform body Heterocal caudal fin Characteristic dorsal fin Gill slits Powerful jaws

Fishes B.Class Chondrichthyes – Cartilaginous Fishes 1.Sharks Wide size range

Fishes B.Class Chondrichthyes – Cartilaginous Fishes 1.Sharks Very good sensory organs

Fishes B.Class Chondrichthyes – Cartilaginous Fishes 1.Sharks Reproduction – live young or eggs

Fishes B.Class Chondrichthyes – Cartilaginous Fishes 1.Sharks Commercially hunted

Fishes B.Class Chondrichthyes – Cartilaginous Fishes 2.Rays and Skates Dorsally flattened bodies Demersal Ventral gills Modified pectoral fins a.Stingrays

Fishes B.Class Chondrichthyes – Cartilaginous Fishes 2.Rays and Skates Dorsally flattened bodies Demersal Ventral gills Modified pectoral fins a.Stingrays

Fishes B.Class Chondrichthyes – Cartilaginous Fishes 2.Rays and Skates b.Electric Rays

Fishes B.Class Chondrichthyes – Cartilaginous Fishes 2.Rays and Skates c.Manta Rays

Fishes B.Class Chondrichthyes – Cartilaginous Fishes 2.Rays and Skates d.Skates

Fishes B.Class Chondrichthyes – Cartilaginous Fishes 3.Ratfishes

Fishes B.Class Osteichthyes – Cartilaginous Fishes Skeleton of bone Make up 96% of all fish Cycloid and ctenoid scales Operculum Homoceral fin

Fishes B.Class Osteichthyes – Cartilaginous Fishes Fin rays Terminal mouth Swim bladder

Fishes - Biology A.Body Shapes Strongly related to lifestyle

Fishes - Biology A.Body Shapes 1.Fusiform Video

Fishes - Biology A.Body Shapes 2.Laterally Compressed Video

Fishes - Biology A.Body Shapes 3.Flattened

Fishes - Biology A.Body Shapes 4.Eel-like Video

Fishes - Biology A.Body Shapes 5.Unusual, Irregular Video