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Issue: Vol. 5699 No. 1: 30 Sept. 2025
Type: Monograph
Published: 2025-09-30
DOI: 10.11646/zootaxa.5699.1.1
Page range: 1-72
Abstract views: 39
PDF downloaded: 3

Lobatoradarea, a new genus of the family Calliopiidae Sars, 1895 (Crustacea: Amphipoda) from Japan, with descriptions of ten new species

Osaka Museum of Natural History; Nagai Park; Higashi-Sumiyoshi; Osaka 546-0034; Japan
Misaki Marine Biological Station; Graduate School of Science; The University of Tokyo; 1024 Koajiro; Misaki; Miura; Kanagawa 238-0025; Japan
Diving Services Chap; 118-2 Okada-Shinkai; Ōshima Town; Tokyo 100-0102; Japan
Faculty of Fisheries; Kagoshima University; 4-50-20 Shimoarata; Kagoshima 890-0056; Japan
Toba Aquarium; 3-3-6 Toba; Toba; Mie 517-8517; Japan
X- STAR; Japan Agency for Marine-Earth Science and Technology (JAMSTEC); Yokosuka; Kanagawa 237-0061; Japan
Crustacea Bathyal coast hydrothermal vent Izu Ōshima Kagoshima Bay key Kumano-nada lower lip Oradarea Ōsumi Strait Sagami Bay subtidal Sumisu Caldera

Abstract

Ten new species of calliopiid amphipods were collected from Japanese waters between 0–694 m deep. All specimens commonly exhibit (1) 1-articulate accessory flagellum, (2) developed inner lobes of lower lip, (3) elongate carpus and propodus of gnathopod 2 in both sexes, and (4) entire telson. Among these characters 1, 3 and 4 are shared with the genus Oradarea, but the character 2 is quite different from Oradarea; therefore, Lobatoradarea gen. nov. is established herein to house these species. The ten new species are described in detail, including Lobatoradarea angulata sp. nov., L. anko sp. nov., L. coccina sp. nov., L. inermis sp. nov., L. kagoshimensis sp. nov., L. lignorum sp. nov., L. littoralis sp. nov., L. obliquua sp. nov., L. subinermis sp. nov., and L. thermicola sp. nov. These species can be distinguished from one another mainly by the presence or absence of the posterodorsal projections on pereonite 7 and pleonites 1, 2, and the shapes of the anteroventral corner of head, the dactyli of pereopods 3–7, the ventral margin of coxa 4, the posteroventral corner of epimeral plate 2, and the telson. A key to these species of Lobatoradarea gen. nov. is provided and the diagnosis of Oradarea is emended.

 

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How to Cite

Ariyama, H., Kohtsuka, H., Hoshino, O., Kodama, M., Moritaki, T. & Chen, C. (2025) Lobatoradarea, a new genus of the family Calliopiidae Sars, 1895 (Crustacea: Amphipoda) from Japan, with descriptions of ten new species. Zootaxa, 5699 (1), 1–72. https://doi.org/10.11646/zootaxa.5699.1.1