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Issue: Vol. 5397 No. 3: 5 Jan. 2024
Type: Article
Published: 2024-01-05
DOI: 10.11646/zootaxa.5397.3.4
Page range: 377-396
Abstract views: 185
PDF downloaded: 77

Three new interstitial species of the genus Neonesidea (Bairdioidea: Podocopida: Ostracoda) from the infralittoral zone in Japan

Graduate School of Integrated Science and Technology; Shizuoka University; 836 Ohya; Suruga-ku; Shizuoka City; 422‒8529 Japan
Graduate School of Integrated Science and Technology; Shizuoka University; 836 Ohya; Suruga-ku; Shizuoka City; 422‒8529 Japan
Graduate School of Integrated Science and Technology; Shizuoka University; 836 Ohya; Suruga-ku; Shizuoka City; 422‒8529 Japan
Crustacea Arthropoda X-ray micro CT scan optimum zone brush-shaped organ grain-size composition

Abstract

This study is the first to report on interstitial species of the genus Neonesidea: Neonesidea arenalocus sp. nov. from the Pacific coast of central Japan, Neonesidea alyamanai sp. nov. from the Pacific coast of south-western Japan, and Neonesidea alwakasaensis sp. nov. from the Sea of Japan coast of western Japan. All three species share a smaller carapace size than that of the epiphytic Neonesidea species; in particular, the carapace width and valve thickness are significantly less. Furthermore, the terminal claws on the walking legs are more linear than those of the epiphytic Neonesidea species. However, these three new species share a feature in the apical portion of the terminal claw on the male’s second antennae and asymmetric brush-shaped organs, which are common to this genus. In addition, the results of our field survey indicate that all three new species occur in coarse-grained sediments (coarse sand to pebbles) in the upper infralittoral zone, particularly on Miho-Masaki Beach, which contains an optimum zone for N. arenalocus sp. nov.

 

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