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Eleutherozoa is a subphylum of echinoderms. They are mobile animals with the mouth directed towards the substrate. They usually have a madreporite, tube feet, and moveable spines of some sort. It includes all living echinoderms except for crinoids. The monophyly of Eleutherozoa has been proven sufficiently well to be considered "uncontroversial ...
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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.
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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]
Crinozoa is a subphylum of mostly sessile echinoderms, of which the crinoids, or sea lilies and feather stars, are the only extant members. [ 1 ] [ 2 ] Crinozoans have an extremely extensive fossil history.
Echinozoa is a subphylum of free-living echinoderms in which the body is or originally was a modified globe with meridional symmetry. Echinozoans lack arms, brachioles, or other appendages, and do not at any time exhibit pinnate structure. [1]
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.