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Medusa of a Hydroid
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Description: Colonial, plant-like animals closely related to jellyfish, with stinging cells, Any member of the invertebrate order Hydroida (class Hydrozoa, phylum Cnidaria). Hydroids have three basic life-cycle stages: (1) a tiny free-swimming planula larva about 1 mm (0.04 inch) long, which settles and grows into (2) a sessile (attached), usually colonial hydroid stage, which in turn liberates (3) medusa.
Source: Benson John Lossing, ed. The New Popular Educator (London: Cassell & Company Limited, 1891) 6:252
Keywords: hydroid, jellyfish, invertebrate, hydroida, hydrozoa, Cnidaria
Copyright: 2009, Florida Center for Instructional Technology. See license.
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