invertebrates octopus video. phylum chordata c. vertebrata share four chordate characteristics +...
DESCRIPTION
FishesTRANSCRIPT
Phylum ChordataC. 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
FishesA. Class Agnatha – Jawless fish
• No jaws• Unpaired fins and no scales1. Hagfishes
FishesA. Class Agnatha – Jawless fish
1. Hagfishes
FishesA. Class Agnatha – Jawless fish
2. Lampreys
FishesB. Class Chondrichthyes – Cartilaginous Fishes
• Includes sharks, rays, skates and ratfish• Cartilage skeleton• Movable jaws• Paired and Unpaired fins• Placoid scales
FishesB. Class Chondrichthyes – Cartilaginous Fishes
1. Sharks• Fusiform body• Heterocal caudal fin• Characteristic dorsal fin• Gill slits• Powerful jaws
FishesB. Class Chondrichthyes – Cartilaginous Fishes
1. Sharks• Wide size range
FishesB. Class Chondrichthyes – Cartilaginous Fishes
1. Sharks• Very good sensory organs
FishesB. Class Chondrichthyes – Cartilaginous Fishes
1. Sharks• Reproduction – live young or eggs
FishesB. Class Chondrichthyes – Cartilaginous Fishes
1. Sharks• Commercially hunted
FishesB. Class Chondrichthyes – Cartilaginous Fishes
2. Rays and Skates• Dorsally flattened bodies• Demersal• Ventral gills• Modified pectoral fins
a. Stingrays
FishesB. Class Chondrichthyes – Cartilaginous Fishes
2. Rays and Skates• Dorsally flattened bodies• Demersal• Ventral gills• Modified pectoral fins
a. Stingrays
FishesB. Class Chondrichthyes – Cartilaginous Fishes
2. Rays and Skatesb. Electric Rays
FishesB. Class Chondrichthyes – Cartilaginous Fishes
2. Rays and Skatesc. Manta Rays
FishesB. Class Chondrichthyes – Cartilaginous Fishes
2. Rays and Skatesd. Skates
FishesB. Class Chondrichthyes – Cartilaginous Fishes
3. Ratfishes
FishesB. Class Osteichthyes – Cartilaginous Fishes
• Skeleton of bone• Make up 96% of all fish• Cycloid and ctenoid scales• Operculum• Homoceral fin
FishesB. Class Osteichthyes – Cartilaginous Fishes
• Fin rays• Terminal mouth• Swim bladder
Fishes - BiologyA. Body Shapes
• Strongly related to lifestyle
Fishes - BiologyA. Body Shapes
1. Fusiform
Video
Fishes - BiologyA. Body Shapes
2. Laterally Compressed Video
Fishes - BiologyA. Body Shapes
3. Flattened
Fishes - BiologyA. Body Shapes
4. Eel-likeVideo
Fishes - BiologyA. Body Shapes
5. Unusual, Irregular
Video