robust shell vs small tortoiseshell

Littoraria undulata compared with Aglais urticae

Key Differences

• robust shell is Least Concern while small tortoiseshell is Near Threatened.

Taxonomic Classification

Rank	robust shell	small tortoiseshell
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum	Mollusca (Mollusks)	Arthropoda (Arthropods)
Class	Gastropoda (Gastropoda)	Insecta (Insects)
Order	Littorinimorpha (Littorinimorpha)	Lepidoptera (Butterflies & Moths)
Family	Littorinidae	Nymphalidae (Brush-footed Butterflies)
Genus	Littoraria	Aglais
Species	Littoraria undulata	Aglais urticae

Evolutionary Relationship

robust shell and small tortoiseshell share a common ancestor at the Kingdom level: Animalia. (Animals)

Conservation Status

robust shell

LC — Least Concern

small tortoiseshell

NT — Near Threatened

Physical Characteristics

Attribute	robust shell	small tortoiseshell
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

robust shell

Habitat

Typically found in terrestrial and aquatic habitats including forests and freshwater.

Range

Found in Taiwan.

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.

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.