Disholcaspis lacuna

Disholcaspis lacuna can be distinguished from other Disholcaspis species by the specific morphology of the galls it induces on oaks, though detailed diagnostic features for the adult wasp itself remain poorly documented. The genus Disholcaspis is characterized by relatively small adult wasps that induce woody, often spherical or bullet-shaped galls on oak twigs and stems. Species-level identification typically requires examination of the gall structure and host oak species, combined with microscopic analysis of adult morphology. D. lacuna is most reliably identified by its association with specific gall forms on particular Quercus species, distinguishing it from the rough bullet gall wasp (D. quercusmamma) and the round bullet gall wasp (D. quercusglobulus).

Associated with oak-dominated forests and woodlands, specifically in areas where host Quercus species occur. The species has been documented in dry-mesic upland deciduous forest habitats where chinquapin oak (Quercus muhlenbergii) and related oak species grow.

North America; documented in the central United States including Missouri, with records from the Ozark Highlands region. The species appears to have a more restricted range than some congeners, with most observations concentrated in the Mississippi River valley and adjacent areas.

• Quercus - gall hostSpecific oak species association requires confirmation; likely includes Q. muhlenbergii based on congener patterns

Exhibits the characteristic cynipid alternation of generations, with a sexual generation producing one gall type and an agamic (parthenogenetic) generation producing a different gall type. The sexual generation typically emerges in spring, while the agamic generation emerges in late autumn or winter. Larval development occurs entirely within the protective gall structure, which provides both shelter and nutrition.

Adult females lay eggs in actively growing oak tissue, introducing chemical compounds that induce gall formation. The induced galls serve as protective enclosures for developing larvae. Adults of the agamic generation are wingless and capable of parthenogenetic reproduction, while the sexual generation produces winged males and females.

As a gall inducer, modifies oak tissue to create specialized microhabitats that support a community of associated organisms. The galls provide food and shelter not only for the gall wasp larvae but also for inquilines (commensal organisms that occupy galls without harming the gall wasp) and parasitoid wasps that attack gall wasp larvae. Contributes to biodiversity in oak ecosystems by creating structural complexity and supporting trophic interactions.

• Disholcaspis quercusmammaAlso induces bullet-shaped galls on oaks; distinguished by gall surface texture and host preferences
• Disholcaspis quercusglobulusProduces round bullet galls; D. lacuna galls differ in specific morphological details
• Disholcaspis cinerosaMealy oak gall wasp with distinct gall morphology; has notably enlarged venom glands relative to body size

• gall wasp
• oak gall
• Cynipidae
• parthenogenesis
• alternation of generations
• Quercus
• oak ecosystem
• inquiline habitat
• parasitoid host

• BugGuide
• iNaturalist taxon
• Gall-Inducing Wasps Have Enlarged Venom Glands, Study Finds
• Coccinelidae | Beetles In The Bush
• The Insects Behind the Weird Growths on Plants
• Bug Eric: Wasp Wednesday: Gall Wasps