X-STAR; Japan Agency for Marine-Earth Science and Technology (JAMSTEC); Yokosuka; Kanagawa 237-0061; Japan; Univ Brest; Ifremer; CNRS; Unit Biologie des Environnements Extrmes marins Profonds; Plouzan France.
X-STAR; Japan Agency for Marine-Earth Science and Technology (JAMSTEC); Yokosuka; Kanagawa 237-0061; Japan.
Zootaxa. 2024 Feb 8;5406(4):501-518. doi: 10.11646/zootaxa.5406.4.1.
A new species of alvinocaridid shrimp is reported, from the Northwest Eifuku hydrothermal vent field at 16191667 m depth on the Mariana Arc. A comprehensive phylogenetic reconstruction of Alvinocarididae based on the mitochondrial cytochrome c oxidase subunit I (COI) gene including this new species reveals the paraphyly of the genus Rimicaris Williams & Rona, 1986 with four other generaAlvinocaridinides, Manuscaris, Opaepele, and Shinkaicarisnested within it. We re-examine material of these four problematic genera, and synonymise them under Rimicaris whose diagnosis has been amended, in order to maintain a monophyletic Rimicaris. Our new species, Rimicaris cambonae sp. nov. is genetically close to Rimicaris loihi (Williams & Dobbs, 1995) comb. nov. (previously Opaepele loihi) with which it co-occurs, but can be morphologically distinguished by the less elevated dorsal surface of the rostrum, this being devoid of a median carina, a stronger pterygostomial tooth on the carapace, and a blunt rather than acuminate proximolateral process on the antennular stylocerite. Species previously assigned to the above listed, synonymized genera are also discussed, with new material examined for three key species: R. loihi, R. acuminata, and R. leurokolos. Further, Alvinocaridinides formosa Komai & Chan, 2010 and Manuscaris liui Wang & Sha, 2016 are synonymized under Rimicaris leurokolos (Kikuchi & Hashimoto, 2000) comb. nov. and R. acuminata (Komai & Tsuchida, 2015) comb. nov., respectively. Revised diagnoses are presented for R. loihi, R. acuminata, and R. leurokolos. After the present revision revision, Rimicaris now consists of 15 species.
一种新的阿拉斯加虾科虾类被报道，来自马里亚纳弧 16191667 米深处的西北贻贝热水喷口场。基于线粒体细胞色素 c 氧化酶亚基 I（COI）基因的阿拉斯加虾科综合系统发育重建，包括这个新物种，揭示了 Rimicaris Williams & Rona，1986 的并系，其中还有另外四个属 Alvinocaridinides、Manuscaris、Opaepele 和 Shinkaicaris。我们重新检查了这些有问题的四个属的材料，并将它们合并为 Rimicaris，其诊断已被修订，以保持 Rimicaris 的单系性。我们的新种，Rimicaris cambonae sp. nov. 在遗传上与 Rimicaris loihi（Williams & Dobbs，1995）comb. nov.（以前的 Opaepele loihi）密切相关，它们共同存在，但在形态上可以通过喙的背表面不那么凸起来区分，这是没有中线脊的，头胸甲上的翼状额齿更强，触角 Stylocerite 的近端侧突较钝而不是尖锐。以前分配给上述列出的，合并的属的物种也进行了讨论，并对三个关键物种进行了新的材料检查：R. loihi、R. acuminata 和 R. leurokolos。此外，Alvinocaridinides formosa Komai & Chan，2010 和 Manuscaris liui Wang & Sha，2016 被合并为 Rimicaris leurokolos（Kikuchi & Hashimoto，2000）comb. nov. 和 R. acuminata（Komai & Tsuchida，2015）comb. nov.，分别。对 R. loihi、R. acuminata 和 R. leurokolos 进行了修订诊断。经过本次修订，Rimicaris 现在由 15 个物种组成。
