Marbled Orbweaver

The marbled orbweaver is a striking orb-weaving spider named for the mottled, marble-like pattern of purple-brown blotches over its bright orange or yellow abdomen, a coloration that has also earned it the nickname "pumpkin spider" in some regions where fall-active females become abundant. This large-bodied, rounded spider is a member of the classic orb weaver genus Araneus and constructs the familiar wheel-shaped web most people associate with garden spiders.

Found across much of North America and northern Europe and Asia, marbled orbweavers favor moist, shrubby habitats near water, woodland edges, and tall vegetation, where they hang a large orb web overnight to intercept flying insects, then often retreat to a nearby silk-lined shelter during the day. Females grow considerably larger than males and are most visible in late summer and autumn as they approach full size before egg-laying.

• Large, rounded abdomen with a mottled, marbled pattern of orange, yellow, and purple-brown blotches
• Legs banded in alternating light and dark segments
• Small cephalothorax relative to the swollen abdomen, typical of orb weavers
• Females are much larger and more colorful than the smaller, slimmer males
• Distinguished from other Araneus species by the specific marbled color pattern and rounded body shape

Marbled orbweavers are typically found in damp, shrubby areas near ponds, streams, marshes, and woodland edges, where tall vegetation provides web anchor points. The species ranges widely across North America as well as northern Europe and Asia. Adults, especially females, become most conspicuous in late summer through fall, when their webs and enlarged abdomens are easiest to spot.

This spider builds a large, vertical orb web each night, often taking it down at dawn and retreating to a silk retreat in nearby foliage, emerging again at dusk to rebuild and hunt. Prey consists mainly of flying insects such as moths, flies, and mosquitoes that blunder into the sticky web spiral. Marbled orbweavers are solitary and non-aggressive, generally fleeing to their retreat rather than confronting disturbances, and are important predators of night-flying insects in their habitat.

After mating in fall, females produce an egg sac containing hundreds of eggs, typically hidden in a silk-lined retreat among leaves or bark, and then die as cold weather sets in. Eggs overwinter and hatch the following spring, with spiderlings dispersing and growing through numerous molts over the summer. The species completes one generation per year, with adults reaching full size and mating in late summer and fall.