Metabetaeus lapillicola, a new species of alpheid shrimp (Decapoda: Caridea) from Japan, inhabiting unusual pebble beaches
Metabetaeus lapillicola, a new species of alpheid shrimp (Decapoda: Caridea) from Japan, inhabiting unusual pebble beaches
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Metabetaeus lapillicola，来自日本的一种新种斑虾（十足目：Caridea），栖息在不寻常的卵石滩上
DOI：
10.11646/zootaxa.5258.3.5
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发表时间：
2023
期刊：
影响因子：
0.9
通讯作者：
KON KOETSU
中科院分区：
文献类型：
--
作者：
YAMASHITA RYUNOSUKE;KOMAI TOMOYUKI;KON KOETSU
先前已知的阿尔菲德虾属Metabetaeus Borradaile(1899)，有两个与苯胺池和洞穴有关的种，M. minutus （Whitelegge, 1897）和M. lohena Banner & Banner, 1960)，以及一个生活在珊瑚礁中的种，M. mcphsonae Anker, 2010。本文根据在日本中部本州静冈县和三重县采集的14个标本，描述了该属的一个新种。在潮间带下游至潮下带上游沉积的小卵石间隙中栖息的Metabetaeus lapillicola n. sp.，不仅是Metabetaeus，甚至对carideans来说都是相当不寻常的栖息地。它与三个同属物种的区别在于，甲壳上有翼口棘，翼足极不相等，主要的翼足相当长，并且在尾足内足上缺乏明显的双侧棘。利用线粒体16S rRNA和COI基因进行的系统发育分析支持对新种的识别。Metabetaeus的属诊断被修正以适应新种。
The alpheid shrimp genus Metabetaeus Borradaile, 1899 was previously known from two species associated with anchialine pools and caves, M. minutus (Whitelegge, 1897) and M. lohena Banner & Banner, 1960, and one species inhabiting in coral reef, M. mcphersonae Anker, 2010. In this study, a new species of the genus is described based on fourteen specimens collected from Shizuoka and Mie Prefectures, Honshu, central Japan. Metabetaeus lapillicola n. sp. inhabits interstitial spaces among small pebbles deposited in lower intertidal to upper subtidal zone, representing rather unusual habitat not only for Metabetaeus, but even for carideans. It is distinguished from three congeneric species by the presence of a pterygostomial spine on the carapace, greatly unequal chelipeds with the major one being substantially elongate, and the lack of a distinct distolateral spine on the uropodal endopod. Phylogenetic analyses using the mitochondrial 16S rRNA and COI genes support the recognition of the new species. The generic diagnosis of Metabetaeus is emended to accommodate the new species.