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<p>The gall midge genus <i>Macrolabis</i> (Diptera: Cecidomyiidae: Dasineurini) comprises 64 known species that are either gall-inducers or inquilines, associated with 26 different plant families. In this study, we report <i>Macrolabis</i> on Celastraceae for the first time and describe a new species, <i>M. yukawai</i> Elsayed n. sp., that forms enlarged flower bud galls of <i>Euonymus oxyphyllus</i> in Fukushima, Japan. A description, illustrations, and life history information of the new species are given. In addition, a molecular phylogenetic analysis including the new species and two other congeners associated with different host families, <i>M. katoi</i> Elsayed, and <i>M. aquilegiae</i> (Kieffer),&#xa0;revealed&#xa0;a well-supported sister relationship between <i>M. yukawai</i> and <i>M. katoi</i>, whereas <i>M. aquilegiae</i> was placed in a separate, precluding a definitive conclusion about the monophyly of <i>Macrolabis</i>.</p>

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First report of the gall midge genus Macrolabis (Diptera: Cecidomyiidae) on Celastraceae, with description of a new species developing in the flower buds of Euonymus oxyphyllus

  • 期刊论文

  • 发表日期：

    2026年3月9日

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  • Ayman Khamis Elsayed,
  • Shuichi Nemoto,
  • Ko Mochizuki,
  • Ayano Mori,
  • Makoto Tokuda

摘要

The gall midge genus Macrolabis (Diptera: Cecidomyiidae: Dasineurini) comprises 64 known species that are either gall-inducers or inquilines, associated with 26 different plant families. In this study, we report Macrolabis on Celastraceae for the first time and describe a new species, M. yukawai Elsayed n. sp., that forms enlarged flower bud galls of Euonymus oxyphyllus in Fukushima, Japan. A description, illustrations, and life history information of the new species are given. In addition, a molecular phylogenetic analysis including the new species and two other congeners associated with different host families, M. katoi Elsayed, and M. aquilegiae (Kieffer), revealed a well-supported sister relationship between M. yukawai and M. katoi, whereas M. aquilegiae was placed in a separate, precluding a definitive conclusion about the monophyly of Macrolabis.