Life Science Terms 2 Learn #11 Invertebrates

body symmetry

1. bilateral: a body with 2 similar halves

2. radial: body parts arranged in a circle

3. asymmetrical: no body symmetry

sessile

permanently attached at the base; not freely moving

filter feeders

aquatic animal or organism that feeds on small particles or organisms strained from the water circulating through its system

hermaphrodite

an organisms that has both male and female reproductve parts, ex: earthworms and flowering plants

tentacles

flexible appendages in invertebrates that serve as organs of touch, taste, grasping

regeneration

to renew or restore a lost, injured, or removed body part

setae

a stiff hair, bristle, or bristle-like part

chitin

a special substance that gives a rigid, hard structure to the exoskeleton of some invertebrates

exoskeleton

like a suit of armor, it allows the invertebrate to move; protects and keeps some invertebrates from drying out on land

ovipositor

in some female insects; an organ at the end of the abdomen that deposits the eggs