Clark, 1938
T. grisea is a small (to ca. 50 mm), grey or red-brown, even purple, sea cucumber, tapering towards the ends and covered with papillae. Its spicules are numerous stout tables with oval perforated discs, a low spire, and the 2 pillars leaning together (Thyone grisea spicules[/l], [l]thyone_grisea_spicules_2.jpgThyone grisea spicules 2[/l]). It has been found in dredged samples from Northwest [l][m]Glossary[/m][r]Australia[/r]Australia.