Sclerothyone

Thandar, 1989

1 species

Tentacles 10, ventral-most two much reduced. Pedicels in double rows, restricted to ambulacra. No interambulacral papillae. Calcareous ring compact, posterior processes of radial plates long, entire or subdivided intop about 10 pieces. Tables of two types: with regular oval four-holed discs with or without a handle on one side, and a short, often arched, two pillared spire; and with irregular plate-like discs with 6-8 holes and usually arched spire. Pedicels with end plates, oblong tables and other plates. Introvert and tentacles with perforated plates and rods but no tables. (Thandar, 1989)