Ch. 27-29 Animals Flashcards
animals
develop through embryonic stages most are motile during at least part of their life cycle
radial symmetry
no front/ back or left/right
bilateral symmetry
2 sided symmetry
ectoderm
germ layer covering the embryos surface
endoderm
innermost germ layer and lines the developing digestive tube called the archenteron
mesoderm
third germ layer that fills the space between the ectoderm and the endoderm in bilaterally symmetric animals
sponges
porifera
lack true tissues
choanocytes
cnidarians
cnidarian
jellies, sea anemones
flatworms
platyhelminthes
protostone
organism where first opening to digestive system that develops is the mouth
annelids
annelida
earthworms
mollusks
mollusca
bivalves, gastropods
mantle
an extension of the body mass that drapes back on itself like a skirt and covers the mantle cavity, secretes the shell in species with a shell
gastropod
mollusk that moves about on its enlarged foot
bivalve
filter feeders, oysters, mussels