Invertebrate Chordates

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Presentation transcript:

Invertebrate Chordates Hemichordata Urochordata Cephalochordata

Hemichordates Deuterostomes Gill slits Dorsal nerve cord

Classes of Hemichordates Enteropneusta Acorn worms Shallow marine animals Pterobranchia Rhabdopleura Colonial, send out feeding zooids

Acorn Worm

Phylum Chordata All chordates are deuterostomes At some time in their life, all chordates have: Notochord Pharyngeal gill slits Dorsal, hollow nerve cord Postanal tail

Subphylum Urochordata Sea squirts or tunicates Larvae show the characteristics of chordates Adults lose notochord, nerve cord, and tail Only animals to have cellulose in their bodies!

Tunicates: Are filter feeders Do not have complex nervous systems Often form large colonies Are monoecious

Tunicate Larva

Adult tunicates

Subphylum Cephalochordata Lancelets (Amphioxus) Notochord runs from head through tail Muscles can contract the notochord Live partially buried in marine sediment Filter feeders Dioecious