Modern Biology Chapter 35

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23 terms

seta

External bristles found in most annelids; aid in movement

parapodia

fleshy protrusions found in polychaetes that aid in locomotion and feeding

crop

Temporary storage area found in earthworms

gizzard

The thick, muscular part of an earthworm's gut that grinds soil, releasing and breaking up organic matter

typslosole

An infolding of the intestinal wall that increases the surface area available for digestion

aortic arch

A muscular blood vessel that links the blood vessels from the dorsal and ventral parts of an animal's body

nephridium

Excretory tubule that eliminates cellular wastes and excess water in an earthworm

clitellum

Swollen area of an earthworm's body that secretes a film a mucus and functions in reproduction

seminal receptacle

Reproductive structure that secretes sperm in an earthworm

trochopore

Larval stage of development found in most aquatic mollusks and annelids

visceral mass

The central region of a molluck's body that contains some internal organs

mantle

Layer of epidermis covering the visceral mass that secretes the shell

mantle cavity

The space between the mantle and visceral mass that protects the gills of mollusks

ganglion

Group of nerve cell bodies in different areas

radula

A flexible, toungelike strip of tissue covered with tough, abrasive teeth that point backwards; main feeding adaption of mollusks

gastropod

A mollusk that has a well-developed head and flattened foot, such as a snail, slug, or conch

hemolymph

Circulatory fluid of a gastropod's circulatory system

hemocoel

Body cavity of a gastropod

bivalve

A mollusk with a shell that is divided into two halves (valves) connected by a hinge

incurrent siphon

Tube found in bivalves through which water enters the body

excurrent siphon

Tube through which water exits that mantel cavity of a bivalve

cephalopod

Marine mollusks that are specialized for a free-swimming, predatory existence

mollusk

an invertebrate with a soft unsegmented body often enclosed in a hard shell containing calcium carbonate

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