Ophionotus hexactis

Ophionotus est un genre d'ophiures antarctiques de la famille des Ophiuridae. Liste d'espèces Selon World Register of Marine Species (14 avril 2015) : Ophionotus hexactis (E. A.

An echinoderm () is any animal of the phylum Echinodermata (), which includes starfish, brittle stars, sea urchins, sand dollars and sea cucumbers, as well as the sessile sea lilies or "stone lilies". While bilaterally symmetrical as larvae, as adults echinoderms are recognisable by their usually five-pointed radial symmetry (pentamerous symmetry), and are found on the sea bed at every ocean depth from the intertidal zone to the abyssal zone. The phylum contains about 7,600 living species, making it the second-largest group of deuterostomes after the chordates, as well as the largest…

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