Common Flat-body vs St. Bees Seed-eater

Agonopterix heracliana compared with Harpalus honestus

Key Differences

Common Flat-body is Least Concern while St. Bees Seed-eater is Critically Endangered.

Taxonomic Classification

Rank	Common Flat-body	St. Bees Seed-eater
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Arthropoda (Arthropods)	Arthropoda (Arthropods)
Class same	Insecta (Insects)	Insecta (Insects)
Order	Lepidoptera (Butterflies & Moths)	Coleoptera (Beetles)
Family	Depressariidae	Carabidae
Genus	Agonopterix	Harpalus
Species	Agonopterix heracliana	Harpalus honestus

Evolutionary Relationship

Common Flat-body and St. Bees Seed-eater share a common ancestor at the Class level: Insecta. (Insects)

View Class: Insecta

Conservation Status

Common Flat-body

LC — Least Concern

St. Bees Seed-eater

CR — Critically Endangered

Physical Characteristics

Attribute	Common Flat-body	St. Bees Seed-eater
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Common Flat-body

Habitat

Typically found in virtually all terrestrial and freshwater habitats.

Range

Distributed across Belgium, Denmark, Norway, and Sweden.

St. Bees Seed-eater

Habitat

Typically found in virtually all terrestrial and freshwater habitats.

Range

Distributed across Belgium and Switzerland. Currently classified as Critically Endangered on the IUCN Red List, this species faces significant conservation challenges across its range.

Common Flat-body

<em>Agonopterix heracliana</em> is a moth belonging to the family Depressariidae within the order Lepidoptera. Commonly known as the common flat-body, this species is named for the flattened resting posture characteristic of the genus Agonopterix. The species is classified as Least Concern on the IUCN Red List, with no indication of significant population decline. <em>Agonopterix heracliana</em> is distributed across northwestern Europe, with documented occurrences in Belgium, Denmark, Norway, and Sweden. Larvae of this species are typically associated with plants in the family Apiaceae, particularly hogweed (Heracleum sphondylium) and related umbellifers, upon which they feed while sheltering in rolled or folded leaves. Adults are typically brownish with subtle markings and are active from late summer through winter and early spring, overwintering as adults — an unusual life history trait among moths. The species inhabits hedgerows, woodland margins, and meadows where its host plants are abundant. Biological traits of this species remain poorly documented in the scientific literature.