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GeezerVison is showing en.wikipedia.org — Ophiurida - Wikipedia
Ophiurida is an order of echinoderms within the class Ophiuroidea. Ophiurida have a world-wide distribution range and are found in oceans in different depths. Most of them are herbivores or detritus feeders. CharacteristicsOphiurida have bursae for respiration and excretion, and dorsal and ventral arm shields are present and usually well developed. Arms are unbranched and incapable of coiling vertically. Most are five-armed, some with 4 or 6 arms as an abnormality, but others properly bear six or seven arms. The madreporite is on the oral surface. The digestive glands are entirely within the central disc.[1] They move their arms side to side by means of ball-and-socket joints. Tropical species tend to contrast color from the environment, but most others prefer to blend in. These biochromes do not include echinochromes. TaxonomyThe order has been divided into the suborders and infraorders by various taxonomists in the past.[2][3][4][5] The latest accepted classification per O'Hara et al. (2017) is as follows:[6]
There is also a suborder with 12 genera which is yet to be named.[9]
The phylogenetic tree per O'Hara et al. (2017) is as follows.[10] References
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