Broad-faced Sac Spider

Scientific Name: Trachelas tranquillus

Order & Family: Araneae, Corinnidae

Size: Females typically 7-10 mm; males 5-7 mm (excluding legs).

Broad-faced Sac Spider

Natural Habitat

Found indoors in homes, especially in cooler months, and outdoors under bark, stones, or leaf litter.

Diet & Feeding

Primarily predatory, feeding on other small arthropods.

Behavior Patterns

Nocturnal hunters that do not build webs for catching prey, but rather for shelter (sacs) where they hide, molt, and lay eggs. They are known for their fast movement.

Risks & Benefits

Their bite can be painful, causing localized redness and swelling, and potentially a necrotic lesion in rare cases, though usually not as severe as a brown recluse. They are beneficial for controlling household pests.

Identified on: 11/12/2025