What does this research mean for the field?

Morphological and molecular evidence demonstrates that Asitrichiosoma is a valid genus distinct from Trichiosoma, encompassing seven newly described species and four new combinations. Novelty: ClaimNovelty.NOVEL_FINDING. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

The research aims to clarify the generic status of Asitrichiosoma and describe its new species.

July 23, 2026Insects0 citationsOpen Access

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On the Generic Status of Asitrichiosoma Malaise, 1939 (Hymenoptera, Cimbicidae, Cimbicinae) and Its Revision, with Description of Seven New Species

GDGuozhu Deng NHNannan He YYYuchen Yan

Key Points

The research aims to clarify the generic status of Asitrichiosoma and describe its new species.
Utilized morphological observations focusing on male sex characteristics such as legs and penis valve.
Analyzed COI genetic data to determine genetic distance from Trichiosoma.
Provided descriptions, illustrations, and taxonomic key for seven newly identified species.
Established a genetic distance of 0.0878 between Asitrichiosoma and Trichiosoma (p < 0.001).
Validated Asitrichiosoma as a distinct genus based on morphological and molecular evidence.
Described seven new species and proposed four new combinations with detailed illustrations.

Abstract

Due to the conspicuous variation in the present morphology, particularly in the male sex (typically the legs and penis valve), the Asitrichiosoma subgenus was established by Malaise, 1939 of the Trichiosoma genus. Based on COI data, the genetic distance between Asitrichiosoma and Trichiosoma is 0.0878, and this genetic distance is significantly different (p < 0.001) from the average genetic distance (0.0256) among the species within the genus Trichiosoma. Based on morphological and molecular data, we recognize Asitrichiosoma as a valid genus. The differences between Asitrichiosoma and Trichiosoma are discussed in detail. The newly elevated genus is revised, and seven new species are described: A. bomei Yan A. brevicorne Yan A. shennong Yan A. sinense Yan A. omei Yan A. poecilomallosum Yan A. nigropilosum Yan & Wei, sp. nov. Descriptions, remarks, illustrations, and a key to the known species of Asitrichiosoma are provided. Four new combinations are proposed: A. himalayanum (Malaise, 1939), A. anthracinum (Forsius, 1930), A. bombiforme (Takeuchi, 1939), A. sikkimense (Konow, 1897), among which A. bombiforme (Takeuchi, 1939), A. sikkimense (Konow, 1897) and A. gansuense Yan & Wei, 2025 are re-described and illustrated. The distribution of the genus is also briefly discussed.

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Cite This Study

Deng et al. (Tue,) studied this question.

synapsesocial.com/papers/6a61aeeefaa9903c51169f26 https://doi.org/https://doi.org/10.3390/insects17070745

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