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Class Hexactelineda

Glass sponges. Six rayed spicules made of silica, often cylindrical or funnel shaped. Phylum porifera

Class Calcarea

Sponges with spicules of carbonate or lime. Phylum porifera

Class Demospongiae

Have spongin or siliceous spicules, or neither. Phylum porifera

Class Anthazoa

"flowering animals," anemones, corals. No medusa stage. Gastrovascular cavity divided by septa. Phylum cnidara

Class Hydrozoa

50% polyp, 50% medusae. Phylum cnidara

Class Scyphozoa

"cup animals" big time jellyfish. No velum. Mouthparts and reproductive organs hang below the bell. Phylum cnidara

Class Turbellaria

Freeliving flatworms. Only a mouth opening. Do not have image forming eyes. Phylum platyhelminthes

Class Trematoda

Sucker flukes. Parasitic. Phylum platyhelminthes

Class Monogenea

Hook flukes. Posterior end has a bulbous structure covered with hooks called an opisthaptor. Phylum platyhelminthes

Class Cestoda

Tapeworms. No digestive tract. Anterior end has a specialized segemnt called a scolex. Phylum platyhelminthes

Class Polychaeta

Marine worms. No clitellum. phylum annelida

Class Oligochaeta

Earth worms. Have a cliteullum. phylum annelida

Class Hirudinea

Leeches. No clitellum, suckers on front and back. phylum annelida

Class Polyplacophora

"Many plate bearing" the chitons. Eight dorsal plates. Phylum mollusca

Class Gastropoda

"Stomach foot" the limpets, snails, and nudibranchs. Torsion. One or no shell. Definite head, usually w/ tentacles. Filter feeders. Phylum mollusca

Class Bivalvia

"two shells" the clams, mussels, oysters, and scallops. Two lateral shells. Foot usually small and wedge shaped. Phylum mollusca

Class Cephalopoda

"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

Class scaphopoda

"Shovel foot" the tooth shells Phylum mollusca

Class Crustacea

water arthopods.

Subclass copepoda

flattened dorsal-ventrally. Major food source. Copepods. Class Crustacea

Subclass Cirripedia

Branched feathery footed animals. Barnacles. Shell consists of overlapping plates. Kick with their feet (cirri) to get food. Class Crustacea

Subclass Malacostraca

Isopods, shrimps, crabs. Class Crustacea

Order amiphipoda

Flattened laterally, amphipods (Subclass Malacostraca)

Order Euphausiidae

Krill, shrimp like but with swimming appendages instead of walking legs. (Subclass Malacostraca)

Order Isopoda

Isopods. Flattened dorsally/ventrally. (Subclass Malacostraca)

Order Decapoda

10 legged animals; true crabs hermit crabs. Flattened dorsally/ventrally. Exoskeleton covered by a carapce (main body covering piece).

Kelp crabs

"Sheild" shaped carapace

Shore crabs

Rectangular carapace

Cancer crabs

Heart shaped carapace

Class Asteroidea

Sea stars. Eyespots on end of arms. Olfactory (smell) organs on end of arms. Eversible stomach. Phylum Echinodermata

Class Echinoidea

Urhcins and sand dollars. Phylum Echinodermata

Class Ophioridea

Brittle stars. No suction cups on tube feet. Serpentine locomotion. Detritus feeders. Phylum Echinodermata

Class Holothuroidea

Sea cucumbers. Biradial symmetry. Tube feet reduced. Plates reduced to ossicles. Sac like body. Phylum Echinodermata

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