Churchyard beetle, Cellar beetle vs small tortoiseshell

Blaps mucronata compared with Aglais urticae

Key Differences

• Churchyard beetle, Cellar beetle is Endangered while small tortoiseshell is Near Threatened.

Taxonomic Classification

Rank	Churchyard beetle, Cellar beetle	small tortoiseshell
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Arthropoda (Arthropods)	Arthropoda (Arthropods)
Class same	Insecta (Insects)	Insecta (Insects)
Order	Coleoptera (Beetles)	Lepidoptera (Butterflies & Moths)
Family	Tenebrionidae	Nymphalidae (Brush-footed Butterflies)
Genus	Blaps	Aglais
Species	Blaps mucronata	Aglais urticae

Evolutionary Relationship

Churchyard beetle, Cellar beetle and small tortoiseshell share a common ancestor at the Class level: Insecta. (Insects)

Conservation Status

Churchyard beetle, Cellar beetle

EN — Endangered

small tortoiseshell

NT — Near Threatened

Physical Characteristics

Attribute	Churchyard beetle, Cellar beetle	small tortoiseshell
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Churchyard beetle, Cellar beetle

Habitat

Typically found in virtually all terrestrial and freshwater habitats.

Range

Found across Europe (9 countries). Currently classified as Endangered on the IUCN Red List, this species faces significant conservation challenges across its range.

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.

Churchyard beetle, Cellar beetle

The churchyard beetle or cellar beetle (Blaps mucronata) is a species of large flightless darkling beetle in the family Tenebrionidae, order Coleoptera. Adults are robust, black-bodied beetles reaching twenty to thirty millimeters in length, with fused elytra that render them incapable of flight, a characteristic that restricts dispersal and makes local populations vulnerable to habitat loss. B. mucronata inhabits dark, cool, and humid environments such as cellars, crypts, cave entrances, stables, and the bases of old stone walls — the latter association explaining the common name churchyard beetle, as ancient stone churches with undisturbed subterranean spaces provide ideal habitat. The species is nocturnal and slow-moving, feeding on decaying organic matter, fungi, and plant debris. Its range historically extended across much of western Europe, including Belgium, Denmark, France, Ireland, and the Netherlands, but populations have declined significantly across this range due to habitat loss associated with modernization of buildings, renovation of historic structures, and reduction of traditional agricultural environments with earthen floors and organic refuse. B. mucronata is currently listed as Endangered on the IUCN Red List, reflecting its sensitivity to habitat degradation and limited dispersal capacity. Conservation efforts in several European countries focus on maintaining undisturbed cellars and crypts as microhabitat refuges. The species produces chemical secretions from abdominal glands as a defense against predators.

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 9 countries:

🇧🇪 Belgium 🇩🇰 Denmark 🇫🇷 France 🇮🇪 Ireland 🇳🇱 Netherlands 🇳🇴 Norway 🇸🇪 Sweden 🇨🇭 Switzerland 🇬🇧 United Kingdom