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Biology Chapter 27
Mollusks and Annelids
| Question | Answer |
|---|---|
| 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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