||Cells with pseudopods, located in the
mesohyl. They are used in processing food, distributing it to other cells,
and for other functions.
||living at or near the bottom of the seas.
||also called collar cells, choanocytes line the inner cavity
of the sponge. They have a sticky, funnel shaped collar (that collects food
particles) and a flagellum (which whips around,
moving water). The sponge obtains its nutrients and oxygen by processing
flowing water using choanocytes. Choanocytes are also involved in sponge
reproduction; they catch floating sperm.
||the epidermis is the layer of cells that covers the outer
surface of the sponge. The thin, flattened cells of the epidermis are called
||the whip like
structure of a choanocyte; the flagellum moves, pushing water (which contains
nourishment) through the sponge
||an animal in which each adult can act as either the female or
the male in reproduction.
||root like tendrils that attach the sponge to rocks.
||an animal without a backbone.
||the gelatinous layer between the outer body of the sponge and
the spongocoel (the inner cavity).
||a large opening in a sponge through which water flows out of
the sponge. Sponges may have more than one oscula.
||a series of tiny pores all over the body of a sponge that let
water into the sponge. One of these is called an ostium.
||pinacocytes are the thin, flattened cells of the epidermis,
the sponge's outer layer of cells.
||cells with pores that allow water into the sponge; they are
located all over the sponge's body.
||permanently attached to a substrate and unable to move on its
own. Adult sponges are sessile.
||spicules are sharp spikes (made of calcium carbonate) located
in the mesohyl. Spicules form the "skeleton" of many sponges.
||the flexible, fibrous fibers that form the skeleton of horny
sponges; spongin is located within the mesohyl.
||the central, open cavity in a sponge through which water
|Water flows into the sponge
||water flows into a sponge through cells with pores (these
cells are called porocytes) located all over its body.
|Water flows out of the
||water flows out of a sponge through large openings called
oscula (plural). Each of these large openings is called an osculum.