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33 terms

Identifying classes

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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