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Hydrozoa - Wikipedia
Hydrozoa (hydrozoans; from Ancient Greek ὕδωρ (húdōr) 'water', and ζῷον (zôion) 'animal') is a taxonomic class of individually very small, predatory animals, some solitary and some colonial, most of which inhabit saline water. The colonies of the colonial species can be large, and in some cases the … Meer weergeven
Most hydrozoan species include both a polypoid and a medusoid stage in their life cycles, although a number of them have only one or the other. For example, Hydra has no … Meer weergeven
Hydroid colonies are usually dioecious, which means they have separate sexes—all the polyps in each colony are either male or … Meer weergeven
• J. Bouillon; M.D. Medel; F. Pagès; J.M. Gili; F. Boero; C. Gravili (2004). "Fauna of the Mediterranean Hydrozoa" (PDF). Scientia Marina. … Meer weergeven
The earliest hydrozoans may be from the Vendian (late Precambrian), more than 540 million years ago.
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