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Issue: Vol. 5696 No. 4: 26 Sept. 2025
Type: Article
Published: 2025-09-26
DOI: 10.11646/zootaxa.5696.4.6
Page range: 567-589
Abstract views: 283
PDF downloaded: 5

A new species of the genus Leucothoe Leach, 1814 (Crustacea: Amphipoda: Leucothoidae) associated with a limid bivalve from Sugashima Island, Japan

Faculty of Fisheries; Kagoshima University; 4-50-20 Shimoarata; Kagoshima 890-0056; Japan; Seto Marine Biological Laboratory; Field Science Education and Research Center; Kyoto University; 459 Shirahama; Nishimuro; Wakayama 649-2211; Japan
Seto Marine Biological Laboratory; Field Science Education and Research Center; Kyoto University; 459 Shirahama; Nishimuro; Wakayama 649-2211; Japan
Yokosuka City Museum; 95 Fukadadai; Yokosuka; Kanagawa; 238-0016; Japan
Faculty of Fisheries; Kagoshima University; 4-50-20 Shimoarata; Kagoshima 890-0056; Japan
Crustacea commensalism COI Limaria symbiosis 18S rDNA

Abstract

A new species of leucothoid amphipod, Leucothoe limidicola sp. nov. was collected from the mantle cavity and tentacles of the file clam, Limaria hirasei (Limidae). Commensalism associated with bivalves has been relatively rare in the genus Leucothoe and the present new species represents the sixth species of bivalve-associated commensal in the genus. According to the molecular phylogenetic analyses based on the partial sequence of the 18S gene, this new species was recovered as sister to Leucothoe akaisen. There were ~1.5% and ~9.4% differences between these two species in the 18S and COI sequences, respectively, and seven species-specific indels in the former. Morphologically, the new species can be distinguished from Le. akaisen by the distally dentate lateral surface of male gnathopod 2 carpus and straight or weakly concave, oblique posterodistal margin of pereopods 6, 7 bases.

 

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How to Cite

Hanaoka, T., Goto, R., Nakajima, H. & Kodama, M. (2025) A new species of the genus Leucothoe Leach, 1814 (Crustacea: Amphipoda: Leucothoidae) associated with a limid bivalve from Sugashima Island, Japan. Zootaxa, 5696 (4), 567–589. https://doi.org/10.11646/zootaxa.5696.4.6