Biology Chapters 26-29

invertebrate

vertebrate

blastula

anus

radial symmetry

bilateral symmetry

cephalization

cnidocytes

nematocyst

polyp

medusa

internal fertilization

external fertilization

gastrovascular cavity

hydrostatic skeleton

pharynx

ganglia

eyespot

group of cells that can detect changes in the amount of light in the environment

hermaphrodite

individual that has both male and female reproductive organs

septa

crop

gizzard

closed circulatory system

nephridia

gill

filamentous organ in aquatic animals specialized for the exchange of gasses with water

open circulatory system

foot

visceral mass

mantle

exoskeleton

appendage

cephalothorax

region of a crustacean formed by the fusion of the head with the thorax

thorax

abdomen

carapace

mandible

endoskeleton

water vascular system