Introduction to Zoology WEEK 12 (11/8-11/12) November 8, 2004 Phylum Enchinodermata – continued from week 11 All Marine – Body fluids are Isosmotic to the sea water – Gastrovascular system – Tube Feet are oriented and move via a combination of muscles and water pressure. Know the cross section images from your book! The ampullae and the tube feet. In the Echinoidea - Aristotle’s Lantern – the picking grinding mouthparts of the sea urchin. Class Asteroidea • True Sea Stars – originally bilaterally symmetrical but have secondarily derived pentamerous symmetry. • Body tissues all isosmotic with sea water –
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Introduction to Zoology WEEK 12
(11/8-11/12)
November 8, 2004
Phylum Enchinodermata – continued from week 11 All Marine – Body fluids are Isosmotic to the sea water – Gastrovascular system – Tube Feet are oriented and move via a combination of muscles and water pressure. Know the cross section images from your book! The ampullae and the tube feet. In the Echinoidea - Aristotle’s Lantern – the picking grinding mouthparts of the sea urchin. Class Asteroidea
• True Sea Stars – originally bilaterally symmetrical but have secondarily derived pentamerous symmetry.
• Body tissues all isosmotic with sea water –
Class Echinoidea • Urchins
o Regular – rounded are used for food by Asian peoples o Irregular – examples are the sea biscuit and the sand dollar.
An echinopleuteus of a sea urchin!
Sand dollars – irregular urchins – the test only! (test is the shell of the urchin)
Strongylocentrotus purporatus- Pacific N.W. Urchin purporatus (purple) Class Holothuroidea
• Sea Cucumbers (fig/ 14.16) • Self evisceration • 3o Bilaterally Symmetrical from a bilaterial larval form to a
radially symmetrical form to a bilaterally symmetrical form for the adult!
Class Crinoidea • Sea Lilies • Feather Stars
Class Ophiroidea • Brittle Stars • Most # of species = most speciose
Phylum Chordata
• Bilaterally symmetrical • Well developed/defined coelom – True coelom {Eucdelic} • Body Cavity lined w/ mesodermally derived peritoneum
_____________________________________________________________ November 10, 2004 Synapomorphies of Chordates
o Chordates have or manifest these chars @ some stage in development.
• Post Anal Tail • Complete digestive system.
Super Phylum Urochordata • Tunicates • Salps • All marine • Tunic – body protective covering • Solitary feeders – suspension feeders • Filter feeders • Page 292 see that page for more details on the urochordates –