Sponges

Created by k_hedlund2010 

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osculum

an opening in a sponge's body through which water exits

ostia

one of the small openings in a sponge's body through which water enters

choanocyte

any of the flagellate cells that line the cavities

gemmule

an asexual reproductive structure produced by some freshwater sponges

amoebocyte

within the body wall of a sponge, a specialized cell that crawls about and delivers nutrients from the choanocytes to the rest of the body cells

spicule

a needle of silica or calcuim carbonate in the skeleton of some sponges

spongin

a fibrous protein that contains sulfur and composes the fibers of the skeleton of some sponges

larvae

an independent and immature form of an organism that is morphologically different from the adult form

heterotroph

an organism that obtains organic food molecules by eating other organisms or their byproducts and that cannot synthesize organic compounds from inorganic materials

epidermis

the outer surface layer of cells of a plant or animal

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