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Temporal range: Latest Precambrian—Recent
Marques & Collins, 2004
Staurozoa is a class of Medusozoa, jellyfishes and hydrozoans. It has one extant order, Stauromedusae (stalked jellyfishes), and one extinct order, Conulatae. The extinct order is largely unknown and described as a possibly cnidarian clade of marine life with shell-like structures, the Conulariida. Staurozoans are small animals [1–4 cm (0.4–1.6 in.)] that live in marine environments, usually attached to seaweeds, rocks, or gravel. They have a large antitropical distribution, a majority found in boreal or polar, near-shore, and shallow waters. Few staurozoans are found in warmer tropical and subtropical water environments of the Atlantic, Indian, and Pacific Ocean basins, but most are known from the Northern Hemisphere.
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