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INVERTEBRATES II - 1 Asteroidea-sea stars 2...

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INVERTEBRATES II – PROTOSTOMES I. Arthropoda A. Major Groups 1. Triolbitomopha -triolobites (extinct) 2. Chelicerata -scorpions, spiders, mites, ticks, sea spiders* 3. Crustacea -shrimps, lobsters, crabs, barnacles, copepods 4. Myriapoda -centipedes, millipedes 5. Insecta -insects B. Characteristics Segmentation with tagmosis Cilia suppressed Reduced coelom C. Synpomorphies 1. Complete exoskeleton of chitin and protein (not collagen) 2. Growth by molting (ecdysone) 3. Jointed appendages 4. Muscles in parallel bands D. Molting and Growth Continuous growth Krill: Form close schools Eaten by many different organisms Barnacles: Suspension feeders on “bottom” of sea Face the direction of the current Mantis shrimp: Eyes are more powerful than ours II. Echinodermata A. Major Groups
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Unformatted text preview: 1. Asteroidea-sea stars 2. Ophiuroidea-brittle stars 3. Echinodea-sea urchins 4. Holothurodea-sea cucmbers 5. Crinoidea-sea lillies B. Characteristics 1. Deuterostomes 2. Primary bilateral symmetry 3. Secondary pentaradial symmetry C. Synapomorphies 1. Tubular coeloms 2. Water vascular system (coelom) 3. Endoskeleton of calcium carbonate 4. Mutable connective tissue-contain endoskeleton ossicles , which are “hole-y” skeletal structures similar to how our skull is assembled-with mutable connective tissue , they have the ability to instantly lack a very limber/flexible spine so that they can become immobile for protection and they can stay like this for as long as they want....
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