Genus: Free-living; skeleton with or without coat; cuirass made of scales and of the basal part of the spicules; coat indistinguishable (Illustrated Guide, 1985). Siliceous scales arranged tangentially and radiating siliceous spines with pointed or bifurcated ends; (Kudo, 1966).
Acanthocystis turfacea sp.,
tape No. 0119, time code 2019,
Torinome kasen park, Nasu-shiobara (formerly Kuroiso) city, Tochigi Pref. Japan, January 13, 1999 by Y. Tsukii
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