Geolycosa wrighti

(Emerton, 1912)

Black-bellied Burrowing Wolf Spider

Geolycosa wrighti is a burrowing wolf in the Lycosidae, found in the United States and Canada. As a member of the Geolycosa, it constructs and occupies vertical burrows in soil, spending most of its life underground. The is known for distinctive defensive where individuals block their burrow entrance using their and legs when disturbed.

Pronunciation

How to pronounce Geolycosa wrighti: /ˌdʒiːoʊlaɪˈkoʊsə ˈraɪti/

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Identification

Members of the Geolycosa can be distinguished from other wolf by the steeply elevated of the compared to the rear portion. Geolycosa wrighti specifically has been referred to as the "Black-bellied Burrowing Wolf Spider," suggesting dark coloration on the . Burrowing wolf spiders possess stout front legs adapted for digging, though excavation is primarily accomplished using the . Females are larger than males, with mature females reaching approximately 21 mm body length and males 15-18 mm.

Habitat

Constructs vertical burrows in soil; occupies burrowing with -lined shafts. Burrow mouths may be ringed with turrets of silk mixed with debris. Prefers sandy soil in open areas with sparse litter.

Distribution

United States and Canada; North America. Specific records include Manitoba and Ontario in Canada.

Behavior

Exhibits burrow-blocking where individuals use their and legs to seal the burrow entrance when disturbed. Shows rapid defensive response times to mechanical disturbance, light, and chemical stimuli. This blocking behavior serves as a protective mechanism against and environmental hazards. Males are known to wander in search of mates during late summer or early autumn.

Similar Taxa

Geolycosa missouriensisBoth are large burrowing wolf in the Geolycosa with similar and , including burrow construction and blocking behavior. Geolycosa missouriensis is more widely documented and ranges across the Great Plains from southern Canada to Texas.

More Details

Research Note

The burrow-blocking of G. wrightii was formally studied and published in Animal Behaviour (1975), representing one of the better-documented behavioral traits for this . Most other details remain poorly documented in accessible literature.