Ant-mimic Sac Spider (likely)

Scientific Name: Castianeira (likely)

Order & Family: Araneae, Corinnidae

Size: 3-9 mm (body length)

Ant-mimic Sac Spider (likely)

Natural Habitat

Often found outdoors under stones, leaf litter, or debris; some can be found indoors. They are active hunters.

Diet & Feeding

Mainly small insects and other arthropods. They are active nocturnal hunters.

Behavior Patterns

These spiders are known for mimicking ants, both in appearance and behavior. They often wave their front legs in the air to resemble antennae. They are active hunters, not relying on webs to catch prey, and are typically nocturnal. They build silken sacs for resting or molting.

Risks & Benefits

Generally considered harmless to humans. Their bites are rare and usually cause only mild, localized reactions (like a bee sting). They are beneficial as they prey on various small insects, helping to control pest populations.

Identified on: 9/22/2025