Clouded slender vs small tortoiseshell

Caloptilia populetorum compared with Aglais urticae

Key Differences

• Clouded slender is Least Concern while small tortoiseshell is Near Threatened.

Taxonomic Classification

Rank	Clouded slender	small tortoiseshell
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Arthropoda (Arthropods)	Arthropoda (Arthropods)
Class same	Insecta (Insects)	Insecta (Insects)
Order same	Lepidoptera (Butterflies & Moths)	Lepidoptera (Butterflies & Moths)
Family	Gracillariidae	Nymphalidae (Brush-footed Butterflies)
Genus	Caloptilia	Aglais
Species	Caloptilia populetorum	Aglais urticae

Evolutionary Relationship

Clouded slender and small tortoiseshell share a common ancestor at the Order level: Lepidoptera. (Butterflies & Moths)

Conservation Status

Clouded slender

LC — Least Concern

small tortoiseshell

NT — Near Threatened

Physical Characteristics

Attribute	Clouded slender	small tortoiseshell
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Clouded slender

Habitat

Typically found in virtually all terrestrial and freshwater habitats.

Range

Found across Europe (6 countries).

small tortoiseshell

Habitat

Typically found in virtually all terrestrial and freshwater habitats.

Range

Found across Europe (41 countries). Listed as Near Threatened, this species requires ongoing monitoring to prevent population decline.

Clouded slender

Clouded slender refers to a small moth in one of several microlepidopteran families characterized by narrow, elongated wings with clouded or mottled patterning, the 'slender' designation reflecting the elongated wing shape typical of gracillariid leaf miners, stathmopodid moths, or similar narrow-winged families. Slender moths of this type are often highly specialized as leaf miners or stem borers in their larval stage, with adults emerging in spring or summer from pupae formed within the mined leaf or on adjacent vegetation. The clouded wing pattern typically consists of subtle brown, grey, and cream mottling or diffuse cross-banding that provides camouflage against bark and foliage substrates. Many slender moth species in Europe and Asia have restricted distributions tied to the availability of specific larval host plants, making them sensitive to changes in plant community composition. Documentation of species through light trapping and larval rearing from identified host plants contributes to understanding the full diversity of microlepidoptera in temperate and subtropical habitats where hundreds of species remain incompletely studied.

small tortoiseshell

small tortoiseshell (Aglais urticae) is classified as Near Threatened (NT) on the IUCN Red List. Close to qualifying as threatened, with populations that may become vulnerable without conservation action.

Shared Countries

Both species can be found in 6 countries:

🇧🇪 Belgium 🇩🇰 Denmark 🇳🇴 Norway 🇷🇺 Russia 🇸🇪 Sweden 🇺🇦 Ukraine