-soft saclike body
-no internal skeleton
-sessile adult
-motile larva
-filter feeders
-live in salt water environ.s
-ex:)sea squirts,scalp
Phylum:Cephalochordata(lancelets)
-no internal skeleton
-transparent
-thin,fishlike body
-segmented
-live in saltwater environ.s
ex:)amphioxus
Phylum:Agnatha
-eel-like w/ soft body
-no scales
-no jaws: round,sucking mouth
-skeleton made of cartilage
-2 chambered heart
-notochord persist throughout life
-Marine & fresh water
-Living species lack paired appendages
-ex:)lampreys,hagfishes
Chordichthyes
-Cartilaginous fishes
-Cartilaginous skeleton
-Flexible jaws
-Rigid impaired fins
-Internal fertilization
-2 chambered heart
-Most live in salty water environ.
-Notochord replace by vertebrae in adult
-May lay eggs/bear live young
-Acute senses,including lateral line syst.
-ex:)sharks,skates,rays
-Phylum:Osteichtyes
-Bony skeleton
-Flexible bony jaws
-Rigid paired fins
-Air filled swim bladder
-2 chambered heart
-Live in salt water & fresh water environ.s
-Respiration mainly through gills
-Most species have external fertilization & lay lrg
number of eggs
Kingdom:Animalia| Back to main page|
