The order Zoantharia Rafinesque, 1815 (Cnidaria, Anthozoa: Hexacorallia): supraspecific classification and nomenclature Author Low, Martyn E. Y. Lee Kong Chian Museum of Natural History, National University of Singapore, 2 Conservatory Drive, Singapore 117377, Republic of Singapore & former address: Department of Marine and Environmental Sciences, Graduate School of Engineering and Science, University of the Ryukyus, 1 Senbaru, Nishihara, Okinawa 903 - 0213, Japan Author Sinniger, Frederic Tropical Biosphere Research Center, University of the Ryukyus, 3422 Sesoko, Motobu, Okinawa 905 - 0227, Japan Author Reimer, James Davis Molecular Invertebrate Systematics and Ecology (MISE) Laboratory, Department of Marine and Environmental Sciences, Graduate School of Engineering and Science, University of the Ryukyus, 1 Senbaru, Nishihara, Okinawa 903 - 0213, Japan; and Tropical Biosphere Research Center, University of the Ryukyus, 1 Senbaru, Nishihara, Okinawa 903 - 0213, Japan jreimer@sci.u-ryukyu.ac.jp text ZooKeys 2016 2016-12-14 641 1 80 http://dx.doi.org/10.3897/zookeys.641.10346 journal article http://dx.doi.org/10.3897/zookeys.641.10346 1313-2970-641-1 903D6413C8024864A662D71C50740E2D BB707A65FFDFFFFBFFFE8B61FFD5FF91 579464 Umimayanthus Montenegro, Sinniger & Reimer, 2015 Umimayanthus Montenegro, Sinniger & Reimer, 2015: 76. Type species. Umimayanthus chanpuru Montenegro, Sinniger & Reimer, 2015, by original designation. Gender. Masculine. Diagnosis. "... can be distinguished from all zoantharians including Parazoanthus spp. by a highly conservative and unique insertion of 9 bp in length (from position 556 to 564 in alignment) and one deletion of 14 bp long (from position 574 to 587) in the mt 16S-rDNA region" ( Montenegro et al. 2015b : 76). Remarks. Specimens examined from this genus-grouping have a branchiform endodermal sphincter muscle ( Swain et al. 2015 ). "... exclusively associated with sponges, usually encrusting and cushion sponges, occasionally with massive sponges. Polyps generally scattered over the sponge surface, but can form defined stoloniferous chains in lines, or form groups of two to three connected polyps. Polyps may be solitary or connected to each other by a stolon through a thin but clearly visible coenenchyme either over or under the sponge surface. Polyps with sand particles and detritus incrusted in column. Tentacles equal or longer than the expanded oral disc diameter." ( Montenegro et al. 2015b : 76). This genus-group currently includes four described species; three in the Indo-Pacific and one in the Atlantic ( Montenegro et al. 2015b ).