Komai Tomoyuki
Natural History Museum and Institute, Chiba, 955-2 Aoba-cho, Chuo-ku, Chiba, 260-8682 Japan..
Zootaxa. 2020 Sep 30;4858(2):zootaxa.4858.2.5. doi: 10.11646/zootaxa.4858.2.5.
A new pagurid hermit crab species is assigned to the genus Kumepagurus Komai Osawa, 2012, previously represented only by the type species, K. cavernicolus Komai Osawa, 2012, known only from a marine cave on Ryukyu Islands, northwestern Pacific. The assignment is made because of the lack of an accessory tooth on the maxilliped 3 ischium, the operculiform right chela, the presence of two distal corneous claws on the left chela fixed finger, the simple pereopods 4 and the development and structure of the male sexual tubes on both coxae of pereopods 5, all characteristic to the type species of the genus. However, in contrast to K. cavernicolus, K. kaikata n. sp. lacks pleurobranchs on the thoracomeres 5 and 6, and in this regard, Kumepagurus is unusual in the family Paguridae. The generic diagnosis of Kumepagurus is emended to accommodate the new species, which is readily distinguished from K. cavernicolus by the proportionately shorter antennular and antennal peduncles and the right cheliped structure and ornamentation, in addition to the difference in the gill number.
一种新的寄居蟹物种被归入Kumepagurus属（小间和小泽，2012年），该属此前仅以模式种K. cavernicolus Komai & Osawa, 2012为代表，仅在西北太平洋琉球群岛的一个海蚀洞中被发现。做出这一归类是因为第三颚足座节上没有副齿、右螯呈盖状、左螯固定指上有两个远端角质爪、第四步足简单，以及第五步足两基节上雄性生殖管的发育和结构，所有这些都是该属模式种的特征。然而，与K. cavernicolus不同，K. kaikata新种在第5和第6胸节上没有侧鳃，在这方面，Kumepagurus属在寄居蟹科中是不寻常的。对Kumepagurus属的诊断进行了修订以容纳新物种，除了鳃的数量不同外，新物种还可通过触角柄节和触角柄节相对较短、右螯足结构和纹饰与K. cavernicolus轻易区分开来。
