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Type: Article
Published: 2023-06-12
Page range: 383-396
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A new species of the genus Pseudocrangonyx (Crustacea: Amphipoda: Pseudocrangonyctidae) from subterranean waters of Japan

Graduate School of Humanities and Social Sciences; Hiroshima University; 1-1-1 Kagamiyama; Higashihiroshima; Hiroshima 739-8524; Japan
Fukui City Museum of Natural History; 147 Asuwakami-cho; Fukui 918-8006; Japan
Department of Zoology; Graduate School of Science; Kyoto University; Kitashirakawa-oiwakecho; Sakyo; Kyoto 606-8502; Japan
Graduate School of Humanities and Social Sciences; Hiroshima University; 1-1-1 Kagamiyama; Higashihiroshima; Hiroshima 739-8524; Japan
Crustacea Fukui molecular phylogeny taxonomy

Abstract

A new species of pseudocrangonyctid amphipod, Pseudocrangonyx asuwaensis, is described from subterranean water in a quarry on Mt. Asuwa “Nanatsuo-guchi”, Fukui Prefecture, Japan. Pseudocrangonyx asuwaensis sp. nov. differs from its congeners in various morphological features, such as head without eyes, relative length of antennae 1, female antenna 2 without calceoli, length ratio of mandibular palp articles, setal numbers on maxillae 1 and 2 inner plates, absence of sternal gills, armature of urosomite 1, and shape of telson. Molecular phylogenetic analyses suggest that P. asuwaensis sp. nov. is clustered with P. komaii Tomikawa & Nakano, 2018, Pseudocrangonyx sp. 7 and Pseudocrangonyx sp. 8, and was the first of these species to diverge.

 

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