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Cnidarians

Animals that exhibit radial symmetry, tissues but no organs and possess stinging cells called nematocysts.

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Vocabulary

Cnidarian

Invertebrate in the phylum Cnidaria that includes animals such as jellyfish and corals; characterized by radial symmetry, tissues, and a stinger called a nematocyst.

coelenteron

Cnidarian digestive cavity.

medusa

(plural, medusae): Body plans of a cnidarians; has a bell-shaped body and is typically motile.

nematocyst

A long, thin, coiled stinger; characteristic of a cnidarian.

nerve net

The simplest invertebrate nervous system; a network of nerves that can sense touch.

planula

Cnidarian larva; develops from the zygote, and continues to develop into a polyp.

polyp

Basic body plan in cnidarians such as jellyfish; tubular in shape and typically sessile.

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