Sea cucumbers of the genus Labidodemas (Holothuroidea: Holothuriida: Holothuriidae) from Indonesia, with the description of a new species and a revised key to the genus Author Setyastuti, Ana Research Center for Oceanography, National Research and Innovation Agency (BRIN). Jalan Pasir Putih I, Ancol Timur, Jakarta Utara, 14430, Indonesia Author Solis-Marin, Francisco Alonso Colección Nacional de Equinodermos “ Dra. Ma. Elena Caso Muñoz ”, Laboratorio de Sistemática y Ecología de Equinodermos, Instituto de Ciencias del Mar y Limnología (ICML), Universidad Nacional Autónoma de México (UNAM), Ciudad de México, C. P. 04510, México Author Lüter, Carsten Museum fuer Naturkunde, Leibniz Institute for Evolution and Biodiversity Science. Invalidenstr. 43, 10115, Berlin, Germany text Zootaxa 2024 2024-09-06 5506 2 227 244 http://dx.doi.org/10.11646/zootaxa.5506.2.4 journal article 10.11646/zootaxa.5506.2.4 1175-5326 13746857 55527A8F-3454-49A2-AD65-ECBAE234C03D Key to the species of the genus Labidodemas 1 Tables with large disc perforated by at least two circles of peripheral holes........................................ 2 - Tables with small discs without peripheral holes or with one circle of peripheral holes............................... 3 2 Tables with high spire....................................................................... L. maccullochi - Tables with low spire or no spire.............................................................. L. americanum 3 Table crown> table disc................................................................................ 4 - Table crown <table disc................................................................................ 7 4 Table disc with very few or without peripheral holes......................................................... 5 - Table disc with one circle of peripheral holes............................................................... 6 5 Rim of table disc spiny, disc with four central holes; table crown with four long acute spines, occasionally bifurcated distally; buttons and pseudo-buttons absent in body wall; anal papillae absent............................... L. quadripartitum - Rim of table disc very spiny, disc with four to five central holes; table crown with four to five long acute spines arranged in regular/overlapping; always bifurcated distally; buttons absent in body wall; pseudo-buttons present in body wall; anal papillae present..................................................................... Labidodemas javaensis sp. nov. 6 Rim of table disc spiny, disc with four to six central holes; table crown with four to five long spines most of them bifurcated distally; table crown> table disc; buttons present in dorsal body wall................................ L. semperianum - Table disc smooth, disc with five to eight central holes; table crown with five to eight huge spines deeply bifurcated distally; table crown >> table disc (up to twice the diameter); buttons present in dorsal and ventral body wall.. L. pseudosemperianum 7 Table spire high, buttons present and smooth........................................................ L. rugosum - Table spire low, buttons present or absent; if present, spiny.................................................... 8 8 Table disc with peripheral holes, buttons present; table crown very irregular............................... L. spineum - Table disc nearly always without peripheral holes; buttons absent; table crown regular....................... L. pertinax