A new genus and new species of Sclerodactylidae (Holothuroidea: Dendrochirotida) from the south-western Atlantic coast Author Martins, Luciana Author Souto, Camilla Author Menegola, Carla text Zootaxa 2012 3506 54 62 journal article 10.5281/zenodo.214409 3d96ed70-e684-4763-bd45-41563b993835 1175-5326 214409 Coronatum gen. nov. Martins & Souto. Diagnosis. Tentacles 10, ventral-most two much reduced. Tube feet scattered on body wall, never restricted to the ambulacra. Calcareous ring compact with short posterior processes. Body wall ossicles are two-pillared tables, tube feet with two-pillared supporting tables, and introvert contains tables and rosettes. Etymology. The name of the genus is derived from the Latin words corona (crown) in reference to the numerous small teeth as shown on top of the body wall tables. The gender is neuter. Type species. Coronatum baiensis sp. nov. Martins & Souto. Remarks. The new genus was described to accommodate only the type species described herein. The twelve Sclerodactylinae genera can be organized into four distinct groups according to the set of ossicles within the body wall: 1) cups ( Apentamera, Deichmannae, Eugeliella ), 2) knobbed buttons ( Eupentacta , Neothyone , Neopentamera , Pachythyone , Pseudothyone ), 3) plates ( Athyone ), and 4) tables ( Havelockia , Sclerodactyla , Coronatum gen. nov. ). Therefore, Coronatum gen. nov. differs from the other groups by having tables in the body wall. Coronatum gen. nov. differs from Havelockia by having rosettes in the introvert, and from Sclerodactyla by the presence of four-pillared tables in the latter genus.