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Biology Chapter 27

Mollusks and Annelids

QuestionAnswer
Septa internal walls between each segment of the worm
Setae bristles attached to each segment of the worm
Crop a place where food moves through & can be stored
Gizzard a place where the food is ground up to be digested
Closed Circulatory System blood is contained within a network of blood vessels
Gill an organ specialized for the exchange of gases underwater
Nephridia are excretory organs that filter fluid in the coelom; act as kidneys
Clitellum band of thickened, specialized segments, secretes a mucus ring into which eggs & sperm are released
Trochophore aquatic mollusks have a free swimming larvae stage
Muscular Foot takes forms including flat structures for crawling, spade shaped structures for burrowing and tentacles for capturing prey
Mantle a thin layer of tissue that covers most of the mollusks body; part of the shell
Shell made by glands in the mantle that secrete calcium carbonate
Visceral Mass beneath the mantle, consists of the internal organs
Radula snails and slugs feed using a flexible tongue shaped structure hundreds of teeth are attached
Siphon a tube like structure through which water enters and leaves the body
Open Circulatory System blood is pumped through vessels by a simple heart
Phylum Mollusa the phylum that mollusks belong to
Characteristics of a Mollusk soft bodied, complete digestive tract, mantle, muscular foot (tentacles), free living larvae, cephalized, and have a radula
Class Gastropoda the class that is single shelled (stomach footed) : consists of snails, land slugs, sea butterflies, sea hares, limpets and nudibranchs (Mollusk)
Class Bivalvia the class that has two shells, most of them are sessile: consists of clams, oysters, mussels and scallops (Mollusk)
Class Cephalopoda the class that is soft bodied (head footed): consists of octopi, squids, cuttefish and nautiluses (Mollusk)
Zebra Mussles name of the famous bivalves that were introduced into the Great Lakes in the 1980s
Phylum Annelidia the phylum earthworms belong to (segmented worms)
Class Polycheata the class that is mostly marine, has a well developed anterior end and setae: consists of fanmworms, bristle worms and tube worms (Annelid)
Class Oligochaeta the class that has the free living larvae trochophore and it consists of earthworms (Annelids)
Class Hirudinea the class that is a parasitic annelid consists of leeches
Created by: swingren
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