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 Belyaev, 1971
 * Elpidia minutissima Belyaev, 1971
 * Elpidia ninae Belyaev, 1975
 * Elpidia solomonensis Hansen, 1956
 * Elpidia soyoae Ogawa, Morita & Fujita, 2020
 * Elpidia sundensis Hansen, 1956
 * Elpidia theeli Hansen, 1956
 * Elpidia uschakovi Belyaev, 1971