Araneus trifolium

(Hentz, 1847)

Shamrock Orbweaver, Shamrock Spider

Araneus trifolium, commonly known as the shamrock orbweaver, is a North American spider in the Araneidae. The exhibits notable color in abdominal patterning, ranging from beige and brown to yellow, orange, and occasionally greenish tones. It constructs large orb webs to capture flying insect prey and is distinguished from similar species by the presence of white dots on the .

Araneus trifolium by (c) Ken-ichi Ueda, some rights reserved (CC BY). Used under a CC-BY license.

Common Spiders U.S. 403-4 Araneus trifolium by James Henry Emerton (1847 – 1931). Used under a Public domain license.

AraneusTrifolium3 by Smidon33. Used under a CC BY-SA 3.0 license.

Pronunciation

How to pronounce Araneus trifolium: //ˌærəˈniːəs trɪˈfoʊliəm//

These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.

Identification

Distinguished from Araneus marmoreus (pumpkin spider) and other orange orb weavers by the presence of multiple white dots on the . The combination of variable background coloration with consistent white spotting separates it from . Leg banding pattern also aids identification.

Images

Appearance

Medium-sized orb weaver with highly variable abdominal coloration. typically beige or brown, occasionally with greenish tint, yellow, or orange. surface marked with several distinct white dots. Legs brown or beige with white bands encircling the joints. Females larger than males, typical for the .

Habitat

Found in diverse terrestrial across its range. Specific microhabitat preferences not well documented in available sources.

Distribution

United States and Canada. Recorded from Alberta and British Columbia in Canada. North American distribution.

Diet

Small flying insects captured in orb web

Behavior

Constructs large orb webs up to 60 cm (2 feet) in diameter. Webs used to intercept and capture flying insect prey. Bite to humans has been reported as painful but not medically significant, with effects comparable to a sting.

Ecological Role

of small flying insects; contributes to regulation through web-based prey capture.

Human Relevance

Bite can be painful but is not dangerous to humans. Occasional incidental encounters in human-inhabited areas.

Similar Taxa

Araneus marmoreusSimilar orange coloration in some A. trifolium individuals causes confusion; distinguished by A. trifolium's white abdominal dots and leg banding pattern

More Details

Color Variation

The exhibits exceptional abdominal color , with individuals ranging from cryptic beige/brown to conspicuous yellow and orange. This variation has led to occasional misidentification as other brightly colored orb weaver species.