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spongeclick to hear

Porous multicell organism, mostly marine (currently about 5,000 species); it anchors itself to a support and filters water to take in food particles.
sponge anatomy of a sponge pinacocyte spongocoel mesohyl endoderm ectoderm incurrent pore osculum water flow choanocyte calcareous sponge

anatomy of a sponge click to hear

pinacocyte click to hear

Flat ectodermal cell forming the outer covering of the sponge.

spongocoel click to hear

Hollow portion of the sponge covered with choanocytes, in which water circulates before exiting through the osculum.

mesohyl click to hear

Gelatinous substance, rich in water, located between the ectoderm and the endoderm.

endoderm click to hear

Inner layer of the sponge formed of cells (choanocytes) whose role is mainly to feed the organism.

ectoderm click to hear

Outer layer of the sponge formed of cells (pinacocytes) whose role is mainly to protect the organism.

incurrent pore click to hear

Opening into the gastric cavity, through which water enters the sponge.

osculum click to hear

Large opening protected by spicules, through which the sponge discharges water from the gastric cavity.

water flow click to hear

Choanocyte flagella allow water to move inside the sponge, carrying oxygen and food particles to it.

choanocyte click to hear

Inner cell having a filament (flagellum), which allows water to circulate and food particles to be caught and digested.

calcareous sponge click to hear

Marine sponge with a skeleton composed of small calcareous needles (spicules).