Callobius claustrarius

Callobius claustrarius
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Subphylum:	Chelicerata
Class:	Arachnida
Order:	Araneae
Infraorder:	Araneomorphae
Family:	Amaurobiidae
Genus:	Callobius
Species:	C. claustrarius
Binomial name
Callobius claustrarius (Hahn, 1833)
Synonyms
Clubiona claustrarius Amaurobius claustrarius Cybaeus tetricus Ciniflo claustrarius

Callobius claustrarius is a species of spider in the family Amaurobiidae. Males of the species reach 8 mm, females about 11 mm. Head and legs are reddish brown, the abdomen is dark grey with an extended brown surface, dotted with lighter brown specks.

Adults can be found from autumn to spring.

This is a palearctic species. In Europe, it is found in mountainous regions, especially in old, moist forests under rocks. C. claustrarius is a rather rare species.

The subspecies C. claustrarius balcanicus (Drensky, 1940) is only found in Bulgaria.¹