Variable Cobweb Spider, Tangled-web Spider
Theridion varians (likely) / Theridion sp.
Theridiidae (Cobweb Spiders / Comb-footed Spiders), Order Araneae
Physical Description
Small spider featuring a bulbous, globose abdomen and a relatively smaller cephalothorax. The abdomen is rounded with a somewhat textured surface, displaying a distinct dorsal pattern. Legs are slender and long relative to the body size.
Size Estimate
Body length is approximately 2.5 mm to 4.5 mm (excluding legs), with a total leg span of around 8 mm to 12 mm. This specimen appears to be an adult female.
Coloration & Markings
Mottled brown, tan, and creamy white coloration. The abdomen exhibits a bright white or pale cream central patch/folium flanked by darker grayish-brown speckled markings, which provides excellent camouflage against soil and leaf litter.
Web Type
Irregular tangled cobweb (tangle web) constructed low to the ground between plant stems, soil crevices, and low foliage.
Eye Arrangement
Eight eyes arranged in two transverse rows of four eyes each, typical for Theridiidae, with small eyes closely grouped on the front of the cephalothorax.
Leg Characteristics
Slender, delicate legs with distinct dark faint banding (annulations) on light tan/transparent bases. Possesses comb-like setae (comb-foot) on the tarsi of the fourth pair of legs used for throwing silk over prey.
Venom & Safety Information
Venom Information
Contains neurotoxic venom optimized for paralyzing small insect prey, but present in minute quantities with fangs too small to effectively penetrate human skin.
Medical Significance
Harmless / Medically Inconsequential. A bite is extremely rare, causing at most minor localized redness or mild itching similar to a small gnat bite.
Safety Recommendations
No action needed. These spiders are beneficial to garden health. If found indoors or unwanted, safely relocate using a small container and paper.
Habitat & Behavior
Habitat & Range
Widespread across North America and Europe. Found in gardens, low ground vegetation, under leaf litter, on low shrubs, and around outdoor structures.
Behavior & Temperament
Extremely timid and non-aggressive. Spends most of its time hanging upside down within its tangle web or hiding under nearby leaves. When disturbed, it quickly drops to the ground or retreats.
Diet & Prey
Feeds on small crawling and flying insects such as ants, small beetles, gnats, flies, and aphids that become entangled in its sticky web strands.
Seasonal Activity
Most active during late spring, summer, and early autumn. Adults are frequently observed from May through September.
Description
A charming and small representative of the comb-footed spider family Theridiidae. Nestled among low-lying purslane stems and soil, this variable cobweb spider uses its intricate, cryptic patterning of cream and brown to remain undetected by predators while waiting for small insects to touch its tangled web.
Key Features
Globose abdomen with a distinct light central dorsal folium/mark, thin banded legs, compact size, comb-foot tarsal bristles, and irregular cobweb structure near ground level.
Similar Species
Phylloneta sisyphia, Steatoda albomaculata, and Enoplognatha ovata. Distinguishable by specific abdominal folium shape, leg banding intensity, and microhabitat.
Life Cycle
Females construct a small spherical egg sac made of pale silk, often guarded near the web or hidden under a leaf. Spiderlings emerge and disperse via ballooning or local crawling. Lifespan is typically around 1 year.
Ecological Importance
Serves as an efficient natural pest control agent in gardens, preying on small crop-damaging insects and pests while serving as food for larger predators like birds and predatory insects.
Conservation Status
Not Evaluated (NE) on the IUCN Red List. Common and stable population across its range.
Interesting Facts
Members of Theridiidae rely on specialized 'combs' on their hind legs to wrap silk around prey from a safe distance before inflicting a venomous bite.
Photography Tips
Use a macro lens with diffuse overhead lighting or fill flash to bring out the subtle dorsal pattern and leg banding against dark soil backgrounds.
Identified: 2026-07-25T18:56:49.644572