Stigmella braunella
(Jones, 1933) Wilkinson et al., 1979
Catalina Cherry Leaf Miner
Stigmella braunella is a micro- in the Nepticulidae, to California. First described by W.W. Jones in 1933, this has a wingspan of 5.4–6.6 mm and completes two per year. The larvae are leaf miners on Prunus ilicifolia (Catalina cherry), feeding within the leaves of this plant.
Pronunciation
How to pronounce Stigmella braunella: //stɪɡˈmɛl.lə braʊˈnɛl.lə//
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Identification
Distinguished from other Stigmella by association with its specific plant Prunus ilicifolia and its restricted California distribution. The small size (5.4–6.6 mm wingspan) and two- cycle are consistent with other Nepticulidae, but definitive identification requires examination of genitalia or molecular analysis. The larval leaf mines on Catalina cherry are distinctive for this species in its range.
Appearance
Wingspan 5.4–6.6 mm. As a pygmy in the Nepticulidae, this is among the smallest Lepidoptera. are not described in detail in available sources. Larvae are leaf miners, creating tunnels within leaf tissue.
Habitat
Associated with stands of Prunus ilicifolia (Catalina cherry), its sole known plant. This evergreen shrub or small tree occurs in chaparral and oak woodland in coastal and island regions of southern California.
Distribution
to California, United States. Records indicate presence in the Nearctic region with specific occurrence in areas supporting its plant Prunus ilicifolia, including the Channel Islands (Santa Catalina Island) and coastal mainland areas where this grows.
Seasonality
Two per year. Late-instar larvae have been encountered throughout the year, suggesting overlapping generations with continuous larval presence.
Diet
Larvae feed exclusively on Prunus ilicifolia (Catalina cherry), mining the leaves. The feeding creates internal tunnels (leaf mines) within the leaf tissue between the upper and lower .
Host Associations
- Prunus ilicifolia - obligate larval Catalina cherry; sole known plant. Larvae mine leaves of this .
Life Cycle
Two per year. Late-instar larvae occur throughout the year, indicating overlapping generations. Specific details of , pupal, and stages are not documented in available sources.
Behavior
Larvae are leaf miners, feeding internally within leaf tissue rather than externally. This concealed feeding habit protects larvae from and desiccation. is not described in available sources.
Ecological Role
As a on Prunus ilicifolia, this contributes to the herbivore associated with this California plant. The species is part of the documented leafminer fauna dependent on native woody plants in the region.
Human Relevance
No direct economic or agricultural significance. The is of interest to lepidopterists and conservation biologists due to its narrow distribution and association with a California native plant. Non-native chestnut species have been shown to support related Stigmella species, but no similar -switching has been documented for S. braunella.
Similar Taxa
- Stigmella multispicataAnother small Nepticulid , but distinguished by association (Siberian elm, Ulmus pumila), Asian origin, and recent invasion into eastern North America rather than California endemicity.
- Stigmella castaneaefoliellaCastanea (chestnut ) found in eastern North America; distinguished by plant association with Castanea rather than Prunus.
More Details
Taxonomic history
Originally described by W.W. Jones in 1933, with the combination later stabilized by Wilkinson et al. in 1979. The specific epithet 'braunella' likely honors Annette F. Braun, a prominent American lepidopterist who worked extensively on Nepticulidae.
Conservation context
As a California with a narrow association, this may be vulnerable to loss affecting Prunus ilicifolia stands. However, no formal conservation assessment has been published.