Laetilia dilatifasciella
Ragonot, 1887
Western Scale-feeding Snout
Laetilia dilatifasciella is a small snout moth (Pyralidae) native to the southwestern United States. have forewings 6–8 mm in length and are active in spring and late summer through fall. The is notable for its predatory larvae that feed on scale insects, making it one of relatively few species with stages.
Pronunciation
How to pronounce Laetilia dilatifasciella: /laɪˈtɪliə dɪˌlætɪˌfæsiˈɛlə/
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Identification
Distinguished from other Laetilia by geographic range (southwestern US) and subtle morphological differences; formerly synonymized with Laetilia coccidivora. Accurate identification requires examination of genitalia or molecular analysis. active in May and July–October, with larvae present in May and October.
Habitat
Associated with supporting insect on woody plants, particularly conifers. Specific microhabitat preferences not documented.
Distribution
Southwestern United States: from southern New Mexico to southern California.
Seasonality
on wing in May, and again from July to October. Larvae present in May and October.
Diet
Larvae are predatory on scale insects (Hemiptera), specifically in Cerococcidae, Coccidae, Dactylopiidae, and Kermesidae. diet not documented.
Host Associations
- Cerococcidae - preylarval food source
- Coccidae - preylarval food source; includes Toumeyella pini (Striped Pine Scale)
- Dactylopiidae - preylarval food source
- Kermesidae - preylarval food source
Life Cycle
Larval stage occurs in May and October, suggesting possible partial bivoltinism or extended larval development. details not documented. emerge in two distinct periods (May; July–October).
Behavior
Larvae actively prey on sedentary scale insects. Specific hunting or feeding not described in detail.
Ecological Role
of scale insects; may contribute to of on conifers and other woody plants. Has been observed feeding on Toumeyella pini (Striped Pine Scale), a pine pest .
Human Relevance
Potential value as a agent for insect pests in forestry and horticulture. Not known to cause damage to plants or products.
Similar Taxa
- Laetilia coccidivoraFormerly considered ; distinguished by subtle morphological features and geographic separation (L. coccidivora occurs east of the Rocky Mountains, L. dilatifasciella in the Southwest). Requires examination for reliable separation.
Misconceptions
Formerly treated as a synonym of Laetilia coccidivora, leading to potential confusion in older literature where 'L. coccidivora' may refer to either .
More Details
Taxonomic history
This was described by Ragonot in 1887 and later synonymized with Laetilia coccidivora. It has since been reinstated as a valid species, though sources differ on current taxonomic status (Catalogue of Life and GBIF list it as a synonym, while iNaturalist treats it as valid).
Scale insect predation
The larval diet specialization on scale insects is unusual among Lepidoptera and represents a derived feeding strategy within Pyralidae. This habit is shared with other Laetilia , which collectively form a small guild of -feeding .