A new Antipathozoanthus species (Cnidaria, Hexacorallia, Zoantharia) from the northwest Pacific Ocean Author Kise, Hiroki https://orcid.org/0000-0002-4099-6469 Graduate School of Engineering and Science, University of the Ryukyus, 1 Senbaru, Nishihara, Okinawa 903 - 0213, Japan & Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology, AIST Tsukuba Central 7, 1 - 1 - 1 Higashi, Tsukuba, Ibaraki 305 - 8567, Japan hkm11sea@yahoo.co.jp Author Obuchi, Masami Endo Shell Museum of Manazuru, 1175 Manazuru, Manazuru, Kanagawa 259 - 0201, Japan Author Reimer, James Davis https://orcid.org/0000-0003-0453-8804 Graduate School of Engineering and Science, University of the Ryukyus, 1 Senbaru, Nishihara, Okinawa 903 - 0213, Japan & Tropical Biosphere Research Center, University of the Ryukyus. 1 Senbaru, Nishihara, Okinawa 903 - 0213, Japan text ZooKeys 2021 2021-05-28 1040 49 64 http://dx.doi.org/10.3897/zookeys.1040.62309 journal article http://dx.doi.org/10.3897/zookeys.1040.62309 1313-2970-1040-49 4244D08FF6D847FCBB710F8187DC13ED 4E173EEF376958F697C1E444C0723A33 Genus Antipathozoanthus Sinniger, Reimer & Pawlowski, 2010 Diagnosis (revised from Sinniger et al. 2010 ; Swain and Swain 2014 , 2015; Kise et al. 2017 ; additions in bold ). Macrocnemic zoantharians with cteniform endodermal muscle or endo-meso transitional sphincter muscle. Encrustations of the column to the outer mesoglea. No mesogleal canals or encircling sinus. Tentacles at least 26 in number. Substrate consists of antipatharians, external surfaces of parchment-like tubes of polychaetes , or calcium carbonate (coral reef). Type species. Gerardia macaronesicus Ocaña & Brito, 2003, by original designation. Remarks. We herein modify the diagnosis of Antipathozoanthus , as A. tubus sp. nov. is clearly located within the clade of Antipathozoanthus with very high support in our molecular phylogenetic analyses. Skeletal secretion as has been reported in A. macaronesicus (Ocaña & Brito, 2003) was not found in any other Antipathozoanthus species, including A. tubus sp. nov.