Two new species of the genus Paradexamine (Crustacea, Amphipoda, Dexaminidae) from Korean Waters

By

Zhang, Xin
Kim, Kyung-Won
Kim, Young-Hyo

Type

Article

Date of Publication

2022

Original Publication

ZooKeys

Volume

1117

Pages

37--52

Subjects

Crustacea , Paradexamine acuta sp. nov , Paradexamine rotundogena sp. nov , taxonomy

Contributed by

Pensoft Publishers

Language

English

Published by

Sofia, Bulgaria Pensoft Publishers

Identifiers

DOI: https://doi.org/10.3897/zookeys.1117.85644

 

Abstract

Two dexaminid amphipod species belonging to the genus Paradexamine were collected from Korean waters. After observation and identification compared with related congeners, these two species are revealed to be new to science. In comparative identification, one of the new species, P. acutasp. nov. is similar to P. houtete in having an acutely rounded lobe and posteroventrally pointed coxa 7. However, this new species is distinguished from P. houtete in having a larger number of medial setae on the propodus of gnathopod 1 and a rounded basis of pereopod 6. This new species is also very similar to P. marlie s.l. Hirayama from Japanese waters, and P. marlie s.l. might be re-established or synonymized with P. acutasp. nov. in the future. The other new species, P. rotundogenasp. nov. is similar to P. tafunsaka in having a rounded eye lobe; however, it is distinguished from P. tafunsaka in having an elongate carpus on gnathopod 2 and the differently shaped basis of pereopod 7. A key to the five Korean species of Paradexamine, including the two new species, is also provided.