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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.
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]
This color occurs due to only the hard, calcified exoskeleton remaining, with further bleaching by sun and saltwater as it reaches the shore. As in other echinoderms, they have five-fold radial symmetry, with a petal-shaped structure, or petalidium, on the aboral surface. The feet containing small hair-like structures (cilia) are located on ...
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 ...
Stylophoran tests are composed of stereom calcite plates, which has traditionally been the basis for assigning them to Echinodermata. However, they also lack the radial symmetry characteristic of most other echinoderms, with the earlier members of the group being flattened and asymmetrical, and the later ones closer to bilateral symmetry.
Download as PDF; Printable version ... Phylum: Echinodermata: Class: Echinoidea: Order: Echinoneoida: Family: Echinoneidae: Echinoneidae is a family of echinoderms ...
Download as PDF; Printable version; ... Phylum: Echinodermata: Class: ... Amphilepidida is an order of echinoderms belonging to the class Ophiuroidea. [1] Families ...
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]