Callirhytis pigra
(Bassett, 1881)
oak midrib gall
A cynipid gall wasp that induces distinctive galls on oak leaves. The exhibits the typical complex of oak gall wasps, with alternating sexual and that produce different gall morphologies on different oak tissues. The refers to the gall's position along the leaf midrib.
Pronunciation
How to pronounce Callirhytis pigra: //kælɪˈraɪtɪs ˈpaɪɡrə//
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Identification
Galls occur on the midrib of oak leaves, distinguishing them from other Callirhytis that form galls on leaf , petioles, or stems. The specific gall and location help separate this species from such as C. quercuspunctata and C. clavula, which produce different gall types on oaks.
Habitat
Associated with oak forests and woodlands where Quercus occur.
Distribution
North America; specific range details limited in available sources.
Host Associations
- Quercus - gall induction plant for gall formation; specific oak not confirmed in sources
Life Cycle
Exhibits heterogony with alternating sexual and , a characteristic trait of Cynipidae on oaks. The sexual generation typically forms galls on catkins or leaves in spring, while the asexual generation produces galls on leaves or stems later in the season. Specific details for C. pigra are not documented in available sources.
Ecological Role
Induces gall formation on oak leaves, creating microhabitats that may be utilized by other organisms including and .
Similar Taxa
- Callirhytis quercuspunctataAlso forms galls on oaks, but produces gouty oak galls on twigs rather than midrib galls on leaves
- Callirhytis clavulaForms woody, hard galls on oaks; distinguished by gall texture and seasonal timing from the more succulent midrib galls of C. pigra