Disholcaspis eldoradensis

(Beutenmuller, 1909)

Honeydew Gall Wasp

Disholcaspis eldoradensis is a in the that induces distinctive on valley oak (Quercus lobata). The is notable for producing sucrose-secreting galls that attract mutualists, particularly , which defend the galls against . This creates a complex trophic involving multiple ant species, parasitoids, and other associated . The species exhibits variable ecological outcomes depending on local conditions, with ant defense benefits varying across years and gall characteristics influencing rates.

Disholcaspis eldoradensis by (c) Ken-ichi Ueda, some rights reserved (CC BY), uploaded by Ken-ichi Ueda. Used under a CC-BY license.

Bulletin - United States National Museum (1960) (19886559504) by Internet Archive Book Images. Used under a No restrictions license.

Disholcaspis eldoradensis galls by Garth Harwood. Used under a CC BY 4.0 license.

Pronunciation

How to pronounce Disholcaspis eldoradensis: /dɪˌsɒl.ˈkæs.pɪs ɛlˌdoʊ.rəˈdɛn.sɪs/

These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.

Identification

produced by D. eldoradensis can be identified by their sucrose-secreting and association with Quercus lobata. The galls are actively tended by , which collect from the gall surface. Gall size and patterns may influence identification, though specific morphological features of the are not detailed in available sources. The can be distinguished from other Disholcaspis species by its specificity and gall secretion characteristics.

Images

Habitat

Associated with Quercus lobata (valley oak) in oak-dominated . Specific habitat conditions beyond presence are not documented in available sources.

Distribution

to western North America, specifically regions where Quercus lobata occurs. The ' range corresponds to that of its , which is to California's Central Valley and adjacent foothills.

Host Associations

Quercus lobata - Valley oak; sole documented for formation

Life Cycle

As a , D. eldoradensis likely exhibits the characteristic typical of the : a sexual spring producing large, hard from which winged of both sexes emerge, and an agamic () generation of wingless females emerging in late autumn or winter. Specific timing and details for this are not documented in available sources.

Behavior

females induce formation on Quercus lobata through chemical secretions, likely involving compounds as documented in related Disholcaspis . The galls secrete sucrose throughout larval development, attracting mutualists that actively tend the galls and defend against . Ant visitation rates and defensive effectiveness vary temporally and spatially.

Ecological Role

-former that creates and food resources for a complex trophic . The sucrose secretions support mutualists, which in turn alter community composition and reduce rates. The serves as a model for studying facultative , multitrophic interactions, and the ecological impacts of ants on mutualisms. Gall secretions may impose photosynthetic costs on plants.

Similar Taxa

Disholcaspis quercusmammaBoth are oak- Disholcaspis with enlarged glands; D. quercusmamma produces rough oak bullet on different oak species and lacks the sucrose-secreting characteristic of D. eldoradensis
Other Disholcaspis speciesMultiple in the induce bullet on oaks; D. eldoradensis is distinguished by its specific association with Quercus lobata and its unique sucrose-secreting gall trait