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Open research questions in Hymenoptera taxonomy and phylogeny

197 gap statements mined from Hymenoptera taxonomy and phylogeny papers in our 7.9M-paper local library, which holds 801 papers on the topic — drawn mostly from each paper's own stated research gap, future-work, challenge and limitation notes, and its abstract. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one.

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What the literature leaves open

  • This difference is not necessarily contradictory because the short cox1 fragment represents only one portion of the mitochondrial genome and may contain insufficient information to reproduce relationships inferred from all 13 PCGs.

    Integrative taxonomy of Trichogramma vitessoides sp. nov. (Hymenoptera, Trichogrammatidae), an egg parasitoid of Heortia vitessoides from southern China · 2026 · DOI

  • As delineated in the Appendix 1, Stigmus is distributed across various regions of China, but systematic surveys are still lacking.

    Six new species of Stigmus (Hymenoptera, Crabronidae) from China, with an updated key to all Chinese species · 2026 · DOI

  • The study highlights the lack of systematic investigation of biological diversity on university campuses. The paper notes that the genus Centrodora has not been thoroughly studied in Jiangxi Province, China.

    Integrative Taxonomy of Centrodora Förster (Hymenoptera: Aphelinidae) from a University Campus in Jiangxi, China: Description of a New Species, Two Provincial Records, and DNA Barcodes · 2026 · DOI

  • Future investigations should focus on multifactorial analyses, integrating host quality, population structure, and maternal physiological state, to unravel the mechanisms underlying sex ratio patterns. Thus, although our evidence is scarce, there is the possibility that during periods without sexual larvae, wasps place one egg per worker larvae, resulting in solitary parasitic larvae.

    Two new species of Szelenyiopria Fabritius (Hymenoptera, Diapriidae), larval koinobiont endoparasitoids of the leaf-cutter ant Acromyrmex coronatus (Fabricius) (Hymenoptera, Formicidae), from Panama · 2025 · DOI

  • However, evidence supporting this trait is scarce and limited to only two of the nine genera (Shaw 1983; Shaw and Sims 2015; Shaw 2017). Given the potential phylogenetic relevance of this structure, further investigation into its prevalence within Rhysipolinae could provide additional insights into the evolutionary history of this group.

    Systematics of the braconid wasp subfamily Rhysipolinae (Hymenoptera, Braconidae) based on UCE data, with the description of a new Neotropical genus · 2025 · DOI

  • In summary, extensive and collaborative collection efforts across all Zambian ecotypes, involving both local research institutions and international taxonomic specialists, are needed to grasp the species richness of Darwin wasps in Zambia.

    Spotlighting Darwin wasps (Hymenoptera, Ichneumonidae) in Zambia: a new species and the urgent need for further exploration · 2025 · DOI

  • Thyreus praevalens is keyed out here through a combination of characters; whilst it could potentially be included in the following couplet based on the dark facial pubescence, it remains unclear if this is a robust character, and so a cautious approach is taken here.

    A contribution to the knowledge of the genus Thyreus Panzer in the West and Central Palaearctic (Hymenoptera, Apidae), with two new species, taxonomic updates, host relationships, and a key to European species · 2025 · DOI

  • The number of new species and locality records in the last 15 years combined with the fact that many islands are still highly understudied demonstrates that considerable work still needs to be done to determine and understand the islands’ ant diversity.

    The ants of the Galápagos Islands (Hymenoptera, Formicidae): a historical overview, checklist, and identification key · 2024 · DOI

  • In the context of biogeographical studies, such introductions can obscure the natural composition of a fauna, a problem that is obviously more severe in regions where the native fauna has not been well studied.

    The sawflies (Hymenoptera, Tenthredinidae) of Greenland · 2026 · DOI

  • Morphological description for the male and additional material are provided, emphasizing external features due to limited information on male genitalia.

    Description of the male Gonatopus pinhalensis (Dryinidae, Gonatopodinae) supported by DNA barcoding and new host records · 2024 · DOI

  • Although the identity of this host remains unknown, one of the scarab beetles observed in spring on H.

    Alloreferent and Apparent Seasonal Polyphenism of Dielis tejensis with an Updated Key to Nearctic Dielis Species (Hymenoptera: Scoliidae) · 2026 · DOI

  • The Microgastrinae (Hymenoptera: Braconidae) are a diverse group of parasitoid wasps that attack larval Lepidoptera, but their associations with Heterogynidae remain unknown.

    Two New European Gregarious Species of Microgastrinae (Hymenoptera: Braconidae), Provisionally Assigned to the Genus Parapanteles Ashmead, 1900, Reared from Different Heterogynis Species (Lepidoptera: Heterogynidae) in the Iberian Peninsula · 2026 · DOI

  • The long-term seasonal parasitism patterns, hereafter referred to as stylopization, and within-nest developmental stage distributions of Vespa-associated Xenidae (Strepsiptera) remain poorly characterized in South Korea.

    Phenology and parasitism rates of Xenos oxyodontes and Xenos moutoni (Strepsiptera: Xenidae) in Vespa (Hymenoptera: Vespidae) in South Korea · 2026 · DOI

  • Triepeolus Robertson (Hymenoptera: Apidae: Nomadinae) is the second‐largest genus of cleptoparasitic apid bees in the world but its evolutionary diversification through space and time has not been previously investigated.

    Phylogenomics and biogeography of the cleptoparasitic bee genus Triepeolus Robertson (Hymenoptera: Apidae), with a revised subgeneric classification of Triepeolus and its sister genus, Epeolus Latreille · 2026 · DOI

  • However, the phylogenetic relationships of species within this genus and their coevolutionary relationships with endogenous bracoviriforms (BVfs) remain unclear.

    Phylogenomic analysis of Chelonus (Hymenoptera: Braconidae): Systematics and coevolution with endogenous bracoviriforms · 2026 · DOI

  • Andrena is one of the most diverse bee genera in the Holarctic Region, yet its species diversity and distribution in Türkiye remain poorly documented.

    Contributions to the Andrena (Hymenoptera, Andrenidae) Fauna of the Mediterranean Region of Türkiye · 2026 · DOI

  • Despite their potential importance in biological control, Scelio species remain poorly documented in Pakistan.

    Taxonomic Insights into the Diversity of Scelio (Hymenoptera: Scelionidae) from Sindh, Pakistan · 2026 · DOI

  • Ancestral state reconstruction indicates that secondary phytophagy has evolved at least seven times within the subfamily Eurytominae, showcasing the evolutionary flexibility of these vastly understudied wasps.

    Phasing in and out of phytophagy: Phylogeny and evolution of the family Eurytomidae (Hymenoptera: Chalcidoidea) based on Ultraconserved Elements · 2025 · DOI

  • Apanteles subandinus is extremely distinct from all other described Apanteles species known from Australia, easily separated by T1 strongly narrowing posteriorly, pterostigma with pale centre, and the propodeum smooth with areola poorly defined by rather short carinae on posterior 1/2.

    DNA barcoding, integrative taxonomy, citizen science, and Bush Blitz surveys combine to reveal 34 new species of Apanteles (Hymenoptera, Braconidae, Microgastrinae) in Australia · 2025 · DOI

  • These genera have been rarely studied in China, with Heterolexis represented by only one previously recorded species and Dapsilarthra and Grammospila each by three species.

    Review of the genera Dapsilarthra Förster, Grammospila Förster and Heterolexis Förster (Hymenoptera, Braconidae, Alysiinae) from China, with description of four new species · 2026 · DOI

  • Although the exact infection rate of these parasites could not be determined, it appears that native strepsipteran parasites have adapted to a non-native Vespa species.

    Stylopization by Xenos spp. (Xenidae, Strepsiptera) in invasive alien hornet, Vespa velutina, in South Korea · 2025 · DOI

  • Ichneumonidae, a dominant and ecologically important family of parasitoids in the large insect order Hymenoptera, are poorly studied in Iraq, with only 18 previously recorded and identified species known so far.

    Ichneumonidae species (Hymenoptera) new to Iraq recorded from Kurdistan · 2025 · DOI

  • Although spatial replication was limited to a single orchard, the results demonstrate that pummelo orchards in this region harbor a morphospecies-rich and functionally diverse hymenopteran community that is overwhelmingly dominated by parasitoids…

    The Diversity of Hymenoptera on Pummelo (Citrus maxima (Burm.) Merr.) · 2026 · DOI

  • Investigating species of Centrodora from other university campuses, - Further studies on the biodiversity of urban university campuses, - Examining the genetic diversity of Centrodora…

    Integrative Taxonomy of Centrodora Förster (Hymenoptera: Aphelinidae) from a University Campus in Jiangxi, China: Description of a New Species, Two Provincial Records, and DNA Barcodes · 2026 · DOI

  • Cleptoparasitic bees represent a poorly studied yet ecologically important component of wild bee communities, responding sensitively to environmental heterogeneity and reflecting local wild bee diversity.

    Cleptoparasitic bees (Apoidea, Anthophila) in rural protected areas in Latium (Italy): a faunistic survey through an integrative taxonomic approach · 2026 · DOI

Most-cited papers in Hymenoptera taxonomy and phylogeny

Most recent work

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Open questions raised by papers listed on this page include: (1) As delineated in the Appendix 1, Stigmus is distributed across various regions of China, but systematic surveys are still lacking (“Six new species of Stigmus (Hymenoptera, Crabronidae) from China, with an…”, 2026); (2) The study highlights the lack of systematic investigation of biological diversity on university campuses (“Integrative Taxonomy of Centrodora Förster (Hymenoptera: Aphelinidae) from a…”, 2026); (3) In the context of biogeographical studies, such introductions can obscure the natural composition of a fauna, a problem that is obviously more severe in regions where the native fauna has not been well studied (“The sawflies (Hymenoptera, Tenthredinidae) of Greenland”, 2026); (4) Although the identity of this host remains unknown, one of the scarab beetles observed in spring on H (“Alloreferent and Apparent Seasonal Polyphenism of Dielis tejensis with an…”, 2026); (5) The phylogenetic relationships of species within this genus and their coevolutionary relationships with endogenous bracoviriforms (BVfs) remain unclear (“Phylogenomic analysis of Chelonus (Hymenoptera: Braconidae): Systematics and…”, 2026). 197 gap statements have been mined from Hymenoptera taxonomy and phylogeny papers in our 7.9M-paper local library, which holds 801 papers on the topic; the gaps come from whichever of those papers state one. They are mostly the research gaps the authors state and the papers' abstracts, plus future-work, limitations and challenges passages. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one, so you can read the original claim in context.

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