Elpidia
''Elpidia'' is a genus of deep-sea sea cucumbers. Members are characterised by their rod-shaped spicules which each have two pairs of obliquely-placed horizontal arms and two vertical apophyses. There is a high degree of endemism in this genus with different species occupying different deep sea basins or regions. Species The following species are recognised in the genus ''Elpidia'': *'' Elpidia adenensis'' Belyaev, 1971 *'' Elpidia antarctica'' Belyaev, 1971 *'' Elpidia atakama'' Belyaev, 1971 *'' Elpidia belyaevi'' Rogacheva, 2007 *'' Elpidia birsteini'' Belyaev, 1971 *''Elpidia chilensis'' Belyaev, 1971 *''Elpidia decapoda'' Belyaev, 1975 *''Elpidia echinata'' (R. Perrier, 1896) *''Elpidia glacialis'' Théel, 1876 *''Elpidia gracilis'' Belyaev, 1975 *''Elpidia heckeri'' Baranova, 1989 *''Elpidia javanica'' Belyaev, 1971 *''Elpidia kermadecensis'' Hansen, 1956 *''Elpidia kurilensis'' Baranova & Belyaev in Belyaev, 1971 *''Elpidia lata'' Belyaev, 1975 *''Elpidia longicirrata'' Be ...
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