Thyoninae

Authority, Date

8 Genera, 2 monotypic; 98 species

Ten tentacles. Calcareous ring slender, long with forked tails. The radialia and interradialia are broadly grown into each other. The whole calcareous ring is constructed in mosaic fashion broken up into small pieces. In the skin plates or plates and cups or tables and plates or only tables. (Panning, 1949)

Small to medium-sized phyllophorids, rarely more than 100 mm long. Body soft. Pedicels numerous, usually scattered all round, but often most crowded ventrally. Tentacles 10, ventral two always reduced. Calcareous ring tubular with long paired posterior processes to radial plates. Spicules of body wall usually in the form of tables of plates (buttons), or absent. (Thandar, 1990)