Atomacera debilis
Say, 1836
trefoil sawfly
Atomacera debilis, commonly known as the trefoil , is a of sawfly in the Argidae. It was first reported from Canada in 1985, representing a northward range extension. The species belongs to a of herbivorous sawflies whose larvae feed on plants in the mallow family (Malvaceae). Larvae possess distinctive morphological characters that have been formally redescribed in scientific literature.
Pronunciation
How to pronounce Atomacera debilis: /ˌætoʊˈmæsərə ˈdɛbɪlɪs/
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Identification
Larvae of A. debilis have unusual morphological characters that distinguish them from other larvae; formal redescription available in Canadian Entomologist (1985). are typical of Argidae sawflies with characteristic wing venation and body form. Specific diagnostic features for separating A. debilis from congeneric such as A. decepta (mallow sawfly) are not detailed in available sources.
Distribution
First reported from Canada (Ontario) in 1985; known from North America. GBIF records confirm presence in Canada (Ontario). iNaturalist observations suggest broader North American distribution with 20 total observations.
Similar Taxa
- Atomacera deceptaAlso a mallow-feeding in the same ; commonly known as the mallow sawfly or hibiscus sawfly. A. decepta is a documented pest of ornamental hibiscus, hollyhocks, and marsh-mallow, whereas A. debilis has been reported on trefoils (Lotus spp.) suggesting different plant associations within the same genus.
More Details
First Canadian Record
The 1985 report in The Canadian Entomologist represents the first documentation of A. debilis in Canada, with the article providing a formal redescription of larval to aid identification.
Related Species Ecology
While specific ecological details for A. debilis are sparse, congeneric A. decepta has been well-studied as a pest of ornamental Malvaceae. A. decepta larvae pass through six instars, pupate in soil or on lower stems, and may have multiple per year in southern regions. This pattern may be informative for understanding A. debilis, though direct extrapolation should be treated cautiously.