Osawa Masayuki, Fujita Yoshihisa
Estuary Research Center, Shimane University, 1060 Nishikawatsu-cho, Matsue, Shimane, 690-8504 Japan.
Okinawa Prefectual University of Arts, 1-4 Shuri-Tounokura, Naha, Okinawa 903-8602, Japan.
Zootaxa. 2022 Dec 2;5214(3):440-450. doi: 10.11646/zootaxa.5214.3.6.
A new hermit crab species of the family Paguridae is described on the basis of two male specimens from Hedo Dome, a submarine cave located on the north coast of Okinawa Island, Ryukyu Islands, southwestern Japan. The assignment of the new species to the genus Eutrichopagurus Komai, 2015 is based on the structure of the gills and right male sexual tube, the article 3 of the antennular peduncle with a prominent tuft of setae on the dorsodistal margin, and the posterior lateral margins of the telson each bearing a prominent tuft of setae. Among two known congeners, Eutrichopagurus crassoculus n. sp. may be closer to the type species of the genus, E. shirakawai Komai, 2015, in having greatly reduced corneas, basally bearing sparse setae, and no small corneous spines or spiniform setae on the dorsal surface of the meri of the ambulatory legs, but is distinguishable by the morphology of the ocular peduncles, ocular acicle, antennular peduncle, and chelipeds.
基于采自日本西南部琉球群岛冲绳岛北海岸一个名为赫托穹顶的海底洞穴中的两只雄性标本，描述了寄居蟹科的一个新种。新物种归入2015年Komai建立的真厚指寄居蟹属（Eutrichopagurus），依据是鳃和雄性右侧生殖管的结构、触角柄节第3节背远端边缘有一显著的刚毛簇，以及尾节后侧缘各有一显著的刚毛簇。在两个已知同属物种中，厚指真厚指寄居蟹新种（Eutrichopagurus crassoculus n. sp.）可能与该属模式种——2015年的白川真厚指寄居蟹（E. shirakawai）关系更近，二者都有大幅缩小的角膜，基部有稀疏刚毛，且步足长节背面无小角质刺或刺状刚毛，但可通过眼柄、眼刺、触角柄节和螯足的形态加以区分。
