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Biology Ch. 6.3 Cnt

Kingdom Animalia - Vertabrates

Phylum Chordata (Chordates) Most members of this phylum are vertebrates with bony skeletons and backbones. Most common on land & in water. Many fewer chordate species than invertebrate species.
A Dorsal Nerve Cord Nerves branch to all parts of the body.
A Notocord Rod of cartilage that runs along the dorsal length of the body.
Gill Slits In the pharynx (throat).
Amnion Fluid-filled sac around the embryo.
Chordate Respiration Fish are the only vertebrates adapted to live their lives entirely in water. They obtain oxygen from the water through their gills. Reptiles, birds & mammals have lung-base respiratory systems.
External Fertilization The egg & sperm meet outside the body. Ex. Sharks, frogs
Internal Fertilization The egg & sperm meet inside the body Ex. Reptiles, birds, mammals Mammals are the only vertebrates in which the embryo develops internally!
Chondrichthyes (Cartilaginous Fish) Skeleton is made of cartilage instead of bone Have 5-7 gill slits but lack gill covers Ex. Rays, skates, sharks
Osteichthyes (Bony Fish) Most numerous of the vertebrates. Skeletons are made of bone. Ex. Herring, trout, cod
Amphibia (Amphibians) In early stages are gill breathers in water, but live as air breathing adults on land. Have a heart with 3 chambers. Ex. Frogs, toads
Reptilia (Reptiles) Have better developed lungs than amphibians. Have a rib cage Skin is thick and scaly & is made from keratin (a protein) They shed their skin several times each year. Ex. Lizards & snakes
Aves (Birds) Have feathers Bones are hallow…..why?? Ex. Robins, Blue Jays, Swallows
Mammalia (Mammals) Have hair Have milk-producing mammary glands Give birth to live young Most live on land A small number are adapted to life in the water (i.e. whales, dolphins)
Created by: Inkina