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<p>To improve the understanding of the taxonomy and host associations in the genus <i>Gastrancistrus</i>, we describe three new species, provide a key to Japanese species, and discuss previously undescribed morphological characters. In this research, <i>Gastrancistrus aerugo</i> Inoue &amp; Matsuo, <b>sp. n.</b>, <i>G. aquilus</i> Inoue &amp; Matsuo <b>sp. n.</b>, and <i>G. yukawai</i> Inoue &amp; Matsuo <b>sp. n.</b> (Hymenoptera: Pirenidae) are newly described from Japan. <i>Gastrancistrus aerugo</i> <b>sp. n.</b> is a parasitoid of an unidentified species of Cecidomyiidae (Diptera), which induces bud galls on <i>Lonicera morrowii</i> (Caprifoliaceae). <i>Gastrancistrus aquilus</i> <b>sp. n.</b> is a parasitoid of <i>Peracecis yukawai</i> (Diptera: Cecidomyiidae), which induces leaf galls on <i>Celtis sinensis</i> (Cannabaceae). <i>Gastrancistrus yukawai</i> <b>sp. n.</b> is a larval solitary endoparasitoid of <i>Pseudasphondylia neolitseae</i> (Diptera: Cecidomyiidae), which induces leaf galls on <i>Neolitsea sericea</i> (Lauraceae). Among these species, <i>G. yukawai</i> is morphologically similar to <i>G. coxalis</i>, which is redescribed in this paper because of the lack of morphological information. A key to Japanese <i>Gastrancistrus</i> species including two more Japanese species: <i>G. fuscicornis</i> and <i>G. sugitama</i> is provided. We also discuss the utility of using the previously undescribed variation in the depth and shape of the transpimeral sulcus and patterning of the lower mesepimeron in species identification.</p>

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Descriptions of three new species of Gastrancistrus (Hymenoptera: Pirenidae), with remarks on previously overlooked morphological characters on the mesosoma

  • 期刊论文

  • 发表日期：

    2026年7月2日

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  • Kishin Inoue,
  • Kazunori Matsuo

摘要

To improve the understanding of the taxonomy and host associations in the genus Gastrancistrus, we describe three new species, provide a key to Japanese species, and discuss previously undescribed morphological characters. In this research, Gastrancistrus aerugo Inoue & Matsuo, sp. n., G. aquilus Inoue & Matsuo sp. n., and G. yukawai Inoue & Matsuo sp. n. (Hymenoptera: Pirenidae) are newly described from Japan. Gastrancistrus aerugo sp. n. is a parasitoid of an unidentified species of Cecidomyiidae (Diptera), which induces bud galls on Lonicera morrowii (Caprifoliaceae). Gastrancistrus aquilus sp. n. is a parasitoid of Peracecis yukawai (Diptera: Cecidomyiidae), which induces leaf galls on Celtis sinensis (Cannabaceae). Gastrancistrus yukawai sp. n. is a larval solitary endoparasitoid of Pseudasphondylia neolitseae (Diptera: Cecidomyiidae), which induces leaf galls on Neolitsea sericea (Lauraceae). Among these species, G. yukawai is morphologically similar to G. coxalis, which is redescribed in this paper because of the lack of morphological information. A key to Japanese Gastrancistrus species including two more Japanese species: G. fuscicornis and G. sugitama is provided. We also discuss the utility of using the previously undescribed variation in the depth and shape of the transpimeral sulcus and patterning of the lower mesepimeron in species identification.