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5 Cards in this Set
- Front
- Back
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3 grades of Metazoa
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Metazoa: marine invertebrates Parazoa: sponges, marine platelike animals Eumetazoa: other |
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two characteristics of Chindaria |
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4 Classes in the Phylum Platyhelminthes (platy- helmin - thes) |
1. Class Turbellaria - flatworms Mostly free-living. Marine and freshwaterKnown for its regenerative abilities50mm 50cmRemarkable mimicry of other fish 2. Class Monogenea Attach to fish tissue and reproduce by direct life cycle.Wide range of hosts Asexual and sexual reproduction 3. Class Trematoda - flukes Complex life cycles with alternating sexual and asexual stages life cycles in intermediate and definitive hosts.Eg. Goes into a fish (intermediate host) which causes it to expose itself at the surface, increasing its likelihood that it will be predated by the now (definitive host) 4. Class Cestoda - tapeworms |
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4 Mollusca
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(Chitons): • 1000 species • Shell composed of 8 dorsal plates • Foot acts as a suction cup • Can creep slowly over rock surface Gastropods: • Largest and most diverse group • 70000+ species (80% of known Molluscs) • Includes garden sn, cuttlefish Tentacles, closed circulatory system Large brains, giant nerve fibers, complex eyes and can learn by reward and punishment Complex behaviour Some have shell, some don’t Bills have no cillia Most can secrete "ink" • ails, fresh water snails, sea slugs, periwinkles Bivalvia: • 20000 species including clams, mussels, scallops and oysters • Most are sedentary filter feeders = very sensitive to low water quality • Cilia on gills move food to mouth Cephalapoda:Includes squid, octopuses |
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