[16] - A. Evolved from segmented worms B. Unique characters...

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Lecture 16 – Invertebrates II I. All Phyla below are bilateral, triploblastic coelomates II. Phylum Mullusca A. Unique characters 1. Foot, visceral mass, mantle (CaCO 3 shell) 2. radula B. Classes 1. Polyplacophora a. 8 plates 2. Gastropoda a. torsion 3. Bivalvia a. hinged shell with adductor muscles 4. Cephalopoda (head-foot) a. no shell III. Phylum Annelida (segmented worms) A. Complete gut B. Closed circulatory C. Classes 1. Oligochaets (few hairs; e.g. earth worm) a. no parapodia b. setae c. reduced head 2. Polychaetes (many hairs) a. parapodia b. setae c. well developed head 3. Hirunda (leeches) a. reduced segmentation b. no setae c. anterior / posterior suckers IV. Arthropods (jointed feet)
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Unformatted text preview: A. Evolved from segmented worms B. Unique characters 1. Jointed legs 2. exoskeleton (chitin) 3. open circulatory system 4. complete gut C. Classes 1. Cheliceriformes (spiders, ticks, horseshoe crabs) a. Chelicera b. no antennae c. cephalothorax 2. Myriapoda (centipedes and millipedes) 3. Hexapoda (insects) a. 3 main body parts b. adults have wings c. incomplete/complete metamorphosis 4. Crustacea (crabs, shrimps, barnacles, lobster) V. Lophophorates VI. Echinodermata (starfish, sea cucumbers, sea urchins) A. Unique characters 1. Deutoerostomes 2. water vascular system 3. larvae bilateral; adults radial symmetry...
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[16] - A. Evolved from segmented worms B. Unique characters...

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