Referral of Thyone neofusus Deichmann, 1941, Thyone adinopoda (Pawson & Miller, 1981 and Havelockia obunca (Lampert, 1885) to the genus Sclerothyone Thandar, 1990, and a replacement name for the preoccupied genus Neothyone Deichmann, 1941 (Echinodermata: Holothuroidea: Dendrochirotida) Author Thandar, A. S. University of KwaZulu-Natal, Westville Campus, P / Bag X 54001, Durban 4000 Author Arumugam, P. University of KwaZulu-Natal, Westville Campus, P / Bag X 54001, Durban 4000 & 205500752 @ stu. ukzn. ac. za; https: // orcid. org 0000 - 0002 - 1945 - 7268 205500752@stu.ukzn.ac.za text Zootaxa 2022 2022-12-07 5219 1 65 71 journal article 203546 10.11646/zootaxa.5219.1.3 0523df85-98fc-4cc3-baff-61c49020a01b 1175-5326 7408120 C39DD77A-45E5-475C-B214-85DEA9D75AA9 Family Sclerothyonidae Thandar, 1989 Remarks. This taxon, erected as Sclerothyoninae by Thandar (1989) within the family Sclerodactylidae , was raised to full family rank by Smirnov (2012) in his revision of the classification of the Holothuroidea . Although not totally accepted by WoRMS (accessed May 2012 ), it is listed as an alternative nomen. Diagnosis . [from Thandar 1989 , as amended by Martins & Tavares 2019 ]. Tentacles 10, ventral-most two much reduced. Calcareous ring not tubular, radial and interradial plates separate or united at base only. Posterior paired processes of radial plates long, 2–8 times the length of ring, either entire of broken into several pieces. Included genera. Sclerothyone ( type genus), Temparena Thandar, 1989 , Neopentamera Deichmann, 1941 , Thandarum Martinez & Brogger, 2012 , and Paulayellus Martins & Tavares ,. 1998.