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  • Thumbnail for Plumularioidea
    cusped or even rim and instead of a diaphragm a well-defined floor with a hydropore that is usually off-center. The hydranths have a conical hypostome and...
    2 KB (221 words) - 16:25, 29 September 2021
  • Thumbnail for Echinaster
    begin to feed on algae. The madreporite develops after 88 days and the hydropore develops on one of the primary plates. The first 40 days of Echinaster's...
    22 KB (2,494 words) - 21:00, 16 March 2024