Steatoda triangulosa
(Triangulate Cobweb Spider)

Featured spider picture The spider species Steatoda triangulosa, commonly known as Triangulate Cobweb Spider, belongs to the genus Steatoda, in the family Theridiidae. Steatoda triangulosa spiders have been sighted 235 times by contributing members. Based on collected data, the geographic range for Steatoda triangulosa includes 8 countries and 39 states in the United States. Steatoda triangulosa is most often sighted indoors, and during the month of April.

Taxonomic Hierarchy

Kingdom: Animalia
Phylum: Arthropoda
Class: Arachnida
Order: Araneae
Suborder: Araneomorphae
Family: Theridiidae
Genus: Steatoda
Species: Steatoda triangulosa

Other Common Names

Triangulate Cobweb Spider, Triangulate Cobweb Weaver

Author

Charles Athanase Walckenaer, 1802

Primary Colors

Sightings Overview

There have been 235 confirmed sightings of Steatoda triangulosa (Triangulate Cobweb Spider), with the most recent sighting submitted on April 7, 2025 by Spider ID member haronfrehbycon. The detailed statistics below may not utilize the complete dataset of 235 sightings because of certain Steatoda triangulosa sightings reporting incomplete data.

Web: 33% of the time, Steatoda triangulosa spiders are sighted in a spider web (Sample size: 235)
Sex: 13 female and 21 male.
Environment: Steatoda triangulosa has been sighted 32 times outdoors, and 209 times indoors.
Outdoors: Man-made structure (20). Low foliage (2). High foliage (1). Ground layer (3). Under rock or debris (4). Open field, pasture, grassland (1). Desert area (1).

Location and Range

Steatoda triangulosa (Triangulate Cobweb Spider) has been sighted in the following countries: Austria, Canada, Germany, Italy, Slovakia, Spain, Turkey, United States.

Steatoda triangulosa has also been sighted in the following states: Alabama, Arizona, Arkansas, California, Colorado, Connecticut, Florida, Georgia, Idaho, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Maryland, Massachusetts, Michigan, Minnesota, Missouri, Nebraska, New Hampshire, New Jersey, New York, North Carolina, Ohio, Oklahoma, Oregon, Pennsylvania, Rhode Island, South Carolina, South Dakota, Tennessee, Texas, Utah, Virginia, Washington, West Virginia, Wisconsin.