Hydrozoa Encrusting a Small Shell
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Hydrozoa (hydrozoans) are a taxonomic class of very small, predatory animals which can be solitary or colonial and which mostly live in saltwater. A few genera within this class live in freshwater. Hydrozoans are related to jellyfish and corals and belong to the phylum Cnidaria.
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Benson John Lossing, ed. The New Popular Educator (London, England: Cassell & Company Limited, 1891)
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