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Glass sponges. Six rayed spicules made of silica, often cylindrical or funnel shaped. Phylum porifera
"flowering animals," anemones, corals. No medusa stage. Gastrovascular cavity divided by septa. Phylum cnidara
"cup animals" big time jellyfish. No velum. Mouthparts and reproductive organs hang below the bell. Phylum cnidara
Freeliving flatworms. Only a mouth opening. Do not have image forming eyes. Phylum platyhelminthes
Hook flukes. Posterior end has a bulbous structure covered with hooks called an opisthaptor. Phylum platyhelminthes
Tapeworms. No digestive tract. Anterior end has a specialized segemnt called a scolex. Phylum platyhelminthes
"Stomach foot" the limpets, snails, and nudibranchs. Torsion. One or no shell. Definite head, usually w/ tentacles. Filter feeders. Phylum mollusca
"two shells" the clams, mussels, oysters, and scallops. Two lateral shells. Foot usually small and wedge shaped. Phylum mollusca
"Head foot" the squid, octopus. Shell= internal in squid. Shell= absent in octopus. Mantle forms posterior part of the animal- muscular. Highly developed eyes, and nervous system. Phylum mollusca
Branched feathery footed animals. Barnacles. Shell consists of overlapping plates. Kick with their feet (cirri) to get food. Class Crustacea
Krill, shrimp like but with swimming appendages instead of walking legs. (Subclass Malacostraca)
10 legged animals; true crabs hermit crabs. Flattened dorsally/ventrally. Exoskeleton covered by a carapce (main body covering piece).
Sea stars. Eyespots on end of arms. Olfactory (smell) organs on end of arms. Eversible stomach. Phylum Echinodermata
Brittle stars. No suction cups on tube feet. Serpentine locomotion. Detritus feeders. Phylum Echinodermata
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