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Invertebrate Chordates Hemichordata Urochordata Cephalochordata.

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Presentation on theme: "Invertebrate Chordates Hemichordata Urochordata Cephalochordata."— Presentation transcript:

1 Invertebrate Chordates Hemichordata Urochordata Cephalochordata

2 Hemichordates Deuterostomes Gill slits Dorsal nerve cord

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

4 Acorn Worm

5 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

6 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!

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

8 Tunicate Larva

9 Adult tunicates

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

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