Euthyonidiella Heding and Panning, 1954

O’Loughlin, P. Mark, Mackenzie, Melanie, Paulay, Gustav & VandenSpiegel, Didier, 2014, Four new species and a new genus of Antarctic sea cucumbers with taxonomic reviews of Cladodactyla, Pseudocnus, Paracucumidae and Parathyonidium (Echinodermata: Holothuroidea: Dendrochirotida), Memoirs of Museum Victoria 72, pp. 31-61 : 33

Euthyonidiella Heding and Panning, 1954

Diagnosis (after Heding and Panning 1954). Tentacles 15–20; tube feet in radial or scattered arrangement; calcareous ring radial plates with paired long undivided posterior prolongations; ossicles tables with 2 pillars.

Type species. Euthyonidiella kyushuensis Heding and Panning, 1954 (type locality southern Japan) (by original designation)

Assigned species and type localities. Euthyonidiella ambigua ( Heding, 1942) ( Tanzania); E. dentata Cherbonnier, 1961 ( Brazil); E. destichada ( Deichmann, 1930) (Caribbean Sea) ; E. dubia Cherbonnier, 1958 ( Sierra Leone); E. huwi O’Loughlin sp. nov. (below; Shag Rock); E. kyushuensis Heding and Panning, 1954 (Kyushu); E. trita ( Sluiter, 1910) (Caribbean Sea) ; E. tungshanensis ( Yang, 1937) (Fujian Sea); E. zacae ( Deichmann, 1938) (Galapagos) .

Remarks. The species assigned to Euthyonidiella are quite similar morphologically with the exception of Phyllophorus tungshanensis Yang, 1937 (assigned to Euthyonidiella by Liao and Clark 1995), and Euthyonidiella dubia Cherbonnier, 1958 . We question these two assignments. A specimen from NW Australia collected at 184–187 m depth (NMV F149748; UF tissue sequence code MOL AF 408) morphologically closely resembles both Euthyonidiella kyushuensis from south Japan and Euthyonidiella ambigua from east Africa. This specimen is provisionally determined as Euthyonidiella kyushuensis .