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