Belonocnema kinseyi

Distinguished from Belonocnema fossoria by the shorter anterior spur on the fore tibia relative to the basitarsus and tibial spur in both generations. Separated from B. treatae in the sexual generation by deeply delimited scutellar foveae narrowly separated by a carina, reddish brown coloration, and in the asexual generation by an indistinctive areolet. The asexual generation forms smooth, unilocular, spherical leaf galls, while the sexual generation forms irregular, multilocular root galls.

Live oak forests and woodlands; specifically associated with Quercus virginiana and Quercus fusiformis in the southern United States.

United States: southern Louisiana, southern Mississippi, a small area of Oklahoma, and south, central, and southeast Texas. Distribution follows that of its host trees, with a species turnover zone in southeast Mississippi where B. treatae replaces B. kinseyi for the remaining eastern range of Q. virginiana.

• Quercus virginiana - hostlive oak; asexual generation forms galls on leaf undersides, sexual generation forms galls on roots
• Quercus fusiformis - hostlive oak; asexual generation forms galls on leaf undersides, sexual generation forms galls on roots

Alternating sexual and asexual generations (heterogony). Asexual generation: females reproduce parthenogenetically, forming smooth, unilocular, spherical galls on the ventral side of leaves; galls are orange or light brown when young and darken with age. Sexual generation: males and females reproduce sexually, forming irregular, multilocular clusters of galls on small rootlets. The two generations were historically confused, leading to taxonomic synonymy until 2021.

Induces gall formation on host oaks through chemical manipulation of plant tissue, creating protected chambers for larval development. Flight activity patterns have been studied as part of ecological research on this species.

Gall-former that induces structural changes in host oak tissues, creating microhabitats for larval development. The galls support associated communities of hymenopteran parasitoids and inquilines; a 2022 study on a related species noted 43 morphospecies of associated hymenopterans across 15 genera and 13 families.

Used as a model organism for studying speciation, ecological adaptation, and the evolution of alternation of generations in gall wasps. The species was named in honor of Alfred Kinsey, the prominent entomologist and sexologist who contributed extensively to knowledge of North American gall wasps.

• Belonocnema treataeOverlapping geographic range and host use; distinguished by less deeply delimited scutellar foveae in sexual generation, different coloration, and distinctive areolet in asexual generation. Historically synonymized with B. kinseyi due to confusion about gall locations.
• Belonocnema fossoriaSimilar morphology and host association; distinguished by longer anterior spur on fore tibia relative to basitarsus and tibial spur in both generations.
• Belonocnema mesoamericanaSister species with similar morphology; distinguished by color and sculpture features, and by sexual generation forming velvety rootlet galls rather than irregular multilocular clusters. Found on Quercus oleoides in Mesoamerica rather than southeastern USA.

The species was incorrectly synonymized with B. treatae from 1998 to 2021 because the sexual generation root galls were believed to be exclusive to B. treatae. Genetic and morphological analysis in 2021 demonstrated that B. kinseyi is a distinct species with its own sexual generation forming root galls.

• BugGuide
• Wikipedia
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• One hundred and sixty years of taxonomic confusion resolved:Belonocnema(Hymenoptera: Cynipidae: Cynipini) gall wasps associated with live oaks in the USA
• Integrative systematics of a new species of the gall wasp genus Belonocnema Mayr (Cynipidae, Cynipini) on the Mesoamerican live oak Quercus oleoides (Fagaceae) and its associated hymenopteran community