marine bio book questions 22110 | Learn flashcards online

marine bio book questions 2/21/10 (8 Cards)

What are peanut worms (phylum), where are they found and why are they called peanut worms.

Phylum Spuncula. found in muddy bottoms, rocks and corals or hide in empty shells. all are marine living mostly in shallow water. the long anterior portion contains a mouth and a set of small lobes or branching tentacles. when these are pulled into the remaining portion of the body the worm becomes compact and looks like a peanut.

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what is the mantel cavity of a bivalve?

large space between the the two halves of the mantel

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how are pearls formed? what are cultured pearls?

when oyster secrets shiny layers of calcium carbonate to coat irritating articles or parasites logged between the inner surface of the mantel.

cultured pears are obtained by inserting a tiny bit of shell or plastic into the mantel.

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do all scallops live attached to a hard surface?

some live unattached and can swim for short distances by ejecting water from the mantle cavity.

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what is the largest bivalve and how large can it get

giant clam and it can get up to 3 feet in length.

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what are Scaphopods where do they live and what do they eat?

they swim by forcing water out of the mantel cavity through the siphon. they eat crabs lobsters and shrimps. crevices in rocks and bottles and cans as homes.

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how do most mollusks reproduce?

external in all but cephalopods and most gastropods.

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What is a spermatophore?

an elongated packet of sperm