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marine organisms for exam 3
| Question | Answer |
|---|---|
| Mollusca | soft bodied, shell, head-foot & viseral mass |
| Polyplacophora | chitons |
| Scaphopoda | tusk shells |
| Gastropoda | snails |
| bivalvia | clams, oysters |
| cephalopoda | jet propulsion, lack shells |
| coleoids | cuttlefish, squids, octopods |
| sipuncula | peanut worms |
| annelida | segmented worms |
| polychaetes | most common annelid |
| errant | polycheata that actively move; fireworms |
| sedentary | polychaeta that are sessile; tubeworms |
| pogonophora | annelidas that lack mouth and digestive track |
| echiura | spoonworms |
| nematoda | roundworms |
| arthropoda | segmented bodies, developed nervous systems |
| chelicerates | arthropods that lack chewing parts; horseshoe crabs |
| mandibulates | arthropods with chewing mouth parts |
| crustacea | 3 body regions, gas exchange, molt |
| decapoda | 5 pairs of walking legs, sexes separate; crabs, lobsters, true shrimp |
| stomatopoda | mantis shrimp; has 2nd pr of thoracis appendages |
| euphausiacea | krill; most biolum |
| amphipoda | shrimp-like; 3 pr of appendages, no larvae stage |
| copepoda | plankton!, largest group of small crustaceans, most abundant zooplankon |
| cirripedia | barnacles, only sessisle crustacean, hermy, |
| echinodermata | stars, urchins, cucumbers; have endoskeleton |
| asteroidea | sea stars; sep sexes but also asex repro |
| ophiurodiea | brittle, basket, and serpent stars; no pedicellariae or suckers |
| echinoidea | sea urchins |
| holothuroidea | sea cucumbers |
| crinoidea | sea lillies and feather stars |
| hemichorata | acorn worms; have proboscis |
| chordates | notocord, gill slits, postanal tail, nerve tube |
| urochorata | tunicates |
| ascidiacea | sea squirts; hermy, budding |
| thaliacea | salps; free swimming tunicates |
| larvacea | free swimming, produce mucus |
| cephalochorata | lancelets; fish-like |
| myxini | hagfish; no scales, bone, jaws, paired appendages; barbels; marine |
| cephalospidomorphi | lampreys, no scales, bone, jaws, paired appendages; some fresh; dorsals; oral disk; 7 silts |
| chondrichthyes | cartilaginous skeltons; jaws and paired fins |
| elasmobranchi | sharks and rays; scales and teeth; no swim bladder |
| holocephali | chimaeras or ratfish; cartilaginous skeltons;no swim bladder, hetero tail, pavement teeth;counter-current |
| sarcopterygii | coelaconths-lobefins; indian ocean; cart column; rostral organs |
| actinopterygii | ray-finned fishes |
| chodrostei | marine sturgeons; heter tails, ganoid scales |
| neotergii | homo tail w/ cycloid or ctenoid |