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- n. Plural form of hydrozoan.
Sorry, no etymologies found.
STROMATOPORA -- colonies of minute hydrozoans allied to corals -- grew in places on the sea floor, secreting stony masses composed of thin, close, concentric layers, connected by vertical rods.
This remarkable feature has ancient origins, dating back to the most primitive animals, such as sponges and hydrozoans.
Scientists have warned the creatures, which are not strictly jellyfish but floating colonies of microscopic hydrozoans, could soon arrive in waters around the Balearic Islands and the Catalan coast.
In turn, anthozoan species seem to have lost their group A HOX9-14 gene (present in hydrozoans; inconclusive data for scyphozoans; figure 1).
For example, hydrozoans have lost their HOX2 genes (present in anthozoans; inconclusive data for scyphozoans; figure 1).
(particularly the hydrozoans Podocoryne and Eleutheria) cast doubt on the conservation of a Hox code in cnidarians
1 Each such zooid in these pelagic colonial hydroids or hydrozoans has a high degree of specialization and, although structurally similar to other solitary animals, are all attached to each other and physiologically integrated rather than living independently.