Taxonomy of the genus Elasmopus (Crustacea, Amphipoda) in Japan and South Korea, with description of a new species

By

Yoshimura, Hiro
Lee, Chi-Woo
Tomikawa, Ko

Type

Article

Date of Publication

2025-12-2

Original Publication

ZooKeys

Volume

1261

Pages

307--335

Subjects

COI , East Asia , Genetic distance , Kimura two-parameter distance , Morphology , p-distance

Contributed by

Pensoft Publishers

Language

English

Published by

Sofia, Bulgaria Pensoft Publishers

Identifiers

DOI: https://doi.org/10.3897/zookeys.1261.162923

 

Abstract

<br> To advance the limited understanding of the East Asian<br> Elasmopus<br> fauna, field surveys were conducted in Japan and South Korea. In the present study, a new species,<br> E. lumbiniger<br> sp. nov.<br> , is described. The new species is distinguished from its congeners by a strongly projected posteroventral corner of the epimeral plate 3, long slender setae on the anterodistal corner of the male gnathopod 2 carpus, a mid-palmar ridge on the male gnathopod 2 propodus, and a smooth posterior margin on the basis of pereopods 5–7. In addition,<br> E. koreanus<br> is recorded in Japan for the first time, and the known distribution range of<br> E. mukuinu<br> has been significantly extended. The nucleotide sequences of the mitochondrial cytochrome<br> c<br> oxidase subunit I (COI) of these species were determined, and the genetic distances among<br> Elasmopus<br> species were provided. A key to the species of<br> Elasmopus<br> found in East Asia is also provided.<br>