Family Sclerodactylidae Panning, 1949

Diagnosis (amended from Smirnov, 2012: 821)

Dendrochirotida with 10 tentacles. Tube feet lying along radii, and often also arranged in the interradii, sometimes papilliform. Calcareous ring high; radial and interradial plates not fragmented, connecting to one another along almost entire length thus forming a short tube; radial plates with forked processes of medium-size, usually subdivided into three-four large pieces. Ossicles: tables with two or four pillars or plates, sometimes baskets or buttons.