Theridula gonygaster

Distinguished from other Theridiidae by the combination of small size, rounded domed abdomen with ladybird-like spotted patterning, and cobweb-building behavior. Separation from congeners requires examination of genitalia; T. gonygaster has the widest distribution in the genus. Resembles ladybird beetles (Coccinellidae) in general form, but possesses eight legs and two body segments (cephalothorax and abdomen) versus beetle morphology.

Small cobweb spider with a rounded, often brightly patterned abdomen. The common name 'Ladybird Spider' derives from coloration reminiscent of ladybird beetles (Coccinellidae), typically featuring contrasting spots or markings on a domed abdomen. Body compact with relatively short legs compared to body size. Sexual dimorphism present, with females generally larger and more vividly patterned than males.

Found in varied habitats including tropical and subtropical vegetation, often in association with human-modified environments. Builds small, irregular cobwebs (tangle webs) typically in low vegetation, shrubs, or artificial structures. The species' successful establishment in introduced ranges suggests adaptability to diverse conditions.

Native to Central and South America, Caribbean. Introduced and established in southwestern Europe, Democratic Republic of the Congo, Madagascar, Seychelles, Georgia, India, China, Japan, Cuba, and the United States (with records from Amazonas, Rio Grande do Sul, and São Paulo states in Brazil specifically noted).

Constructs irregular cobweb or tangle webs for prey capture. The species' common name and coloration suggest possible protective mimicry of unpalatable ladybird beetles, though this has not been experimentally verified. Nocturnal web-building activity typical of family.

Generalist predator in web-based food webs; contributes to arthropod population regulation in both native and introduced ranges. Potential prey for larger invertebrates and small vertebrates.

Introduced populations indicate human-mediated dispersal, likely through shipping and trade. No documented medical or economic significance; not known to be venomous to humans. Presence in iNaturalist database with 389 observations indicates moderate public awareness and documentation effort.

• Coccinellidae (ladybird beetles)Convergent resemblance in body shape and coloration; distinguished by eight legs, two body segments, and web-building behavior in Theridula versus six legs, hardened forewings (elytra), and three body segments in beetles.
• Other Theridula speciesRequire genital examination for definitive separation; T. gonygaster distinguished by distribution pattern and subtle morphological differences.

• cobweb spider
• introduced species
• mimicry
• Theridiidae
• Neotropical
• widespread

• BugGuide
• Wikipedia
• GBIF taxonomy match
• iNaturalist taxon
• Catalogue of Life