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Issue: Vol. 5583 No. 2: 3 Feb. 2025
Type: Article
Published: 2025-02-03
DOI: 10.11646/zootaxa.5583.2.7
Page range: 353-370
Abstract views: 81
PDF downloaded: 4

A new species of the alpheid shrimp genus Athanas Leach, 1814 (Decapoda: Caridea) from Japan, and additional record of Athanas exilis Komai & Henmi, 2023, clarifying male characteristics

Natural History Museum and Institute; Chiba; 955-2 Aoba-cho; Chuo-ku; Chiba; 260-8682 Japan
Maizuru Fisheries Research Station; Kyoto University; Nagahama; Maizuru; Kyoto; 625–0086 Japan
Crustacea Athanas acudactylus Athanas phyllocheles Sagami Bay Wakasa Bay 16S rRNA sexual dimorphism

Abstract

Two species of the alpheid shrimp genus Athanas Leach, 1814 are reported based on material from Wakasa Bay, Sea of Japan, and additional material from Sagami Bay, Japan. The identities of these two species were assessed through a phylogenetic analysis using the nucleotide sequences of the mitochondrial 16S rRNA gene. The first species, Athanas acudactylus sp. nov., is described based on two female specimens from Wakasa Bay and Sagami Bay. It resembles A. hongkongensis Bruce, 1990, differing from it in the armature of the telson posterior margin, the longer antennular peduncle, the absence of minute spiniform setae on the flexor margins of the third and fourth pereopod propodi, and the bispinous posterolateral end of the uropodal protopod. Male specimens with peculiar leaf-like chelae were identified as A. exilis Komai & Henmi, 2023, previously known only by the female holotype from Wakasa Bay. A supplemental description of A. exilis focused on the species’ male characteristics, is provided. The differences between A. exilis and the closely related A. phyllocheles Banner & Banner, 1983 are discussed.

 

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