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<p>Studying material recently collected in the Chaco region of Mariscal José Félix Estigarribia, Northwestern Paraguay, the authors found a new species of <i>Ylasoia</i>, which represents the second known species of this genus. The previously known species, <i>Ylasoia pegasus</i> (Wiedemann, 1828), is widely distributed across the Atlantic, Paraná, Araucaria and Yungas forest biogeographical provinces of South America in Brazil, Paraguay and Argentina. The new species is described and illustrated in detail, including the male terminalia and female spermathecae. It can be easily distinguished from its congener by its unique color pattern of setae and scales on thorax and abdomen, as well as the band shape and color on the wings. The results of this study include a diagnosis for the genus, an identification key to the Neotropical genera of Lomatiinae and species of <i>Ylasoia</i>, comments on the variations observed in the color patterns of bands and marks on the wings of <i>Y</i>. <i>pegasus</i> and a distribution map including all examined records (voucher specimens deposited in collections or observations published on the iNaturalist platform) for <i>Ylasoia</i>, together with a biogeographic discussion.</p>

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A new species of Ylasoia Speiser, 1920 (Diptera, Bombyliidae, Lomatiinae) from the Paraguayan Chaco, with a discussion on the biogeography of the genus and an identification key to Neotropical Lomatiinae genera and Ylasoia species

  • 期刊论文

  • 发表日期：

    2025年7月9日

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  • Carlos José Einicker Lamas,
  • Bolívar R. Garcete-Barrett

摘要

Studying material recently collected in the Chaco region of Mariscal José Félix Estigarribia, Northwestern Paraguay, the authors found a new species of Ylasoia, which represents the second known species of this genus. The previously known species, Ylasoia pegasus (Wiedemann, 1828), is widely distributed across the Atlantic, Paraná, Araucaria and Yungas forest biogeographical provinces of South America in Brazil, Paraguay and Argentina. The new species is described and illustrated in detail, including the male terminalia and female spermathecae. It can be easily distinguished from its congener by its unique color pattern of setae and scales on thorax and abdomen, as well as the band shape and color on the wings. The results of this study include a diagnosis for the genus, an identification key to the Neotropical genera of Lomatiinae and species of Ylasoia, comments on the variations observed in the color patterns of bands and marks on the wings of Y. pegasus and a distribution map including all examined records (voucher specimens deposited in collections or observations published on the iNaturalist platform) for Ylasoia, together with a biogeographic discussion.