Araneus trifolium
(Shamrock Orb-weaver)

Featured spider picture The spider species Araneus trifolium, commonly known as Shamrock Orb-weaver, belongs to the genus Araneus, in the family Araneidae. Araneus trifolium spiders have been sighted 54 times by contributing members. Based on collected data, the geographic range for Araneus trifolium includes 2 countries and 16 states in the United States. Araneus trifolium is most often sighted outdoors, and during the month of September.

Taxonomic Hierarchy

Kingdom: Animalia
Phylum: Arthropoda
Class: Arachnida
Order: Araneae
Suborder: Araneomorphae
Family: Araneidae
Genus: Araneus
Species: Araneus trifolium

Common Name (AAS)

Shamrock Orb-weaver

Other Common Names

Pumpkin Spider, Shamrock Spider

Author

Nicholas Marcellus Hentz, 1847

Primary Colors

Sightings Overview

There have been 54 confirmed sightings of Araneus trifolium (Shamrock Orb-weaver), with the most recent sighting submitted on October 30, 2025 by Spider ID member sdum25. The detailed statistics below may not utilize the complete dataset of 54 sightings because of certain Araneus trifolium sightings reporting incomplete data.

Web: 37% of the time, Araneus trifolium spiders are sighted in a spider web (Sample size: 54)
Sex: 8 female and 0 male.
Environment: Araneus trifolium has been sighted 64 times outdoors, and 5 times indoors.
Outdoors: Man-made structure (29). Low foliage (16). Ground layer (11). Freshwater river, lake, stream (1). Open field, pasture, grassland (6). Forest (1).

Location and Range

Araneus trifolium (Shamrock Orb-weaver) has been sighted in the following countries: Canada, United States.

Araneus trifolium has also been sighted in the following states: Alaska, California, Colorado, Illinois, Indiana, Maine, Michigan, Minnesota, New Hampshire, New York, Ohio, Pennsylvania, Rhode Island, Vermont, Virginia, Wisconsin.