1.
an individual of a colonial cnidarian that has a cylindrical body and tentacles surrounding the mouth.
2.
the free-swimming, typically bell-shaped form of a cnidarian such as a jellyfish.
3.
surface the surface of an organism on which the mouth is located.
4.
surface the surface of an organism opposite the mouth.
5.
a specialized cell found in cnidarians that contains a nematocyst used for capturing prey and defense.
6.
the gelatinous layer between the two epithelial layers of a cnidarian.
7.
a microscopic capsule containing a coiled thread that can be expelled to sting prey, found in cnidarians.
8.
a small freshwater cnidarian with a tubular body and tentacles surrounding the mouth.
9.
a free-swimming marine cnidarian with a gelatinous bell-shaped body and trailing tentacles.
10.
anemone a marine cnidarian resembling a flower, with a ring of tentacles surrounding the mouth.
11.
reef a ridge of rock in the sea formed by the growth and deposit of coral.
12.
a ring-shaped coral reef, island, or series of islets surrounding a lagoon.
13.
the simplest type of sponge body structure in which water flows through pores into the spongocoel and out through the osculum.
14.
a sponge body form with folded body walls that increase surface area for water filtration.
15.
the most complex sponge body form, consisting of many chambers connected by canals.
16.
flagellated cells that line the interior of sponges and function in feeding and water circulation.
17.
the large central cavity of a sponge through which water flows.
19.
large opening in a sponge through which water exits.
21.
release of eggs and sperm into the water by aquatic animals.
23.
as a thin crust on a surface.
25.
whose skeletons are made of silica, giving them a glass-like structure.
27.
that bore into hard substrates such as coral, shells, or rock.
28.
type of red algae that deposits calcium carbonate in its cell walls and often contributes to reef building.
