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According to the World Register of Marine Species (WoRMS), the following genera are included in the family: [1]. Dermechinus (Mortensen, 1942)-- 1 species; Echinus Linnaeus, 1758-- 9 species
A brittle star, Ophionereis reticulata A sea cucumber from Malaysia Starfish exhibit a wide range of colours. This List of echinoderm orders concerns the various classes and orders into which taxonomists categorize the roughly 7000 extant species [1] as well as the extinct species of the exclusively marine phylum Echinodermata.
F. A. Bather's diagram of Echinoderm phylogeny from A Treatise on Zoology, Part III: The Echinoderma" (1900). Originally defined by F. J. Bell in a sense that excluded Holothuroidea, Eleutherozoa was expanded by F. A. Bather in his 1900 taxonomy to include all free-living echinoderms.
The Oegophiurida are an order of brittle stars, class Ophiuroidea.. The physical characteristics of this order include well separated lateral plates, which expose the oral surface of radial ossicles.
This genus belongs to a group of genera allied to Lepiota with a white spore print, free (or almost free) gills, stipe easily separable from the cap and having a partial veil. [3]
Echinoderms (sea urchins, sea lilies, sea stars, crinoids, ...) are animals in the phylum Echinodermata. There are 5 subphyla, some of them being extinct: †Homalozoa, Crinozoa, Asterozoa, Echinozoa and †Blastozoa.
The following species, dating back to the Early Jurassic, were originally placed in Ophiura but are now thought to belong to a different subdivision, or are at least known to not actually belong to the genus: [1]
Image Scientific name Distribution Echinometra insularis H.L. Clark, 1912: Easter Island. Echinometra lucunter (Linnaeus, 1758): western Atlantic Ocean and the Caribbean Sea. ...