Marbled Orb-Weaver, Pumpkin Spider
Araneus marmoreus
Family Araneidae (Orb-Weavers), Order Araneae
Physical Description
The marbled orb-weaver features a robust, bulbous abdomen that is significantly larger than the cephalothorax, typical of female orb-weavers. The body surface is finely bristled with short setae, and the abdomen has a smooth yet glossy texture that accentuates its vibrant coloration. The cephalothorax is smaller, compact, and slightly hairy.
Size Estimate
Body length ranges from 9 to 20 mm for females, with males being smaller at around 6 to 9 mm. The leg span can reach up to 40 to 50 mm. The specimen shown appears to be a mature or sub-adult female.
Coloration & Markings
The base coloration of the abdomen is a bright, striking orange or yellow, heavily patterned with dark brown, black, or purplish markings resembling marbling or a carved face, particularly near the rear. The legs feature distinct black and white or yellowish banding.
Web Type
Builds a classic vertical orb web consisting of sticky spiral threads and non-sticky structural radii. The web is typically constructed among tall vegetation, shrubs, or near human structures, and the spider often hides in a folded leaf retreat at the edge of the web during the day.
Eye Arrangement
Eight small eyes arranged in two horizontal rows typical of the Araneidae family, with the four median eyes forming a central square and lateral eyes paired on each side.
Leg Characteristics
Long, relatively strong legs adorned with conspicuous spines and prominent contrasting dark and light banding. When resting on the web, they adopt an outstretched posture, and the legs are equipped with claws adapted for manipulating silk.
Venom & Safety Information
Venom Information
Contains mild neurotoxic venom used primarily to immobilize insect prey. It is not specialized for defense against large vertebrates.
Medical Significance
Not medically significant to humans. A bite may cause minor, localized pain, redness, or swelling similar to a mosquito bite, but they rarely bite unless heavily provoked or squeezed.
Safety Recommendations
No special safety measures required beyond avoiding handling them roughly. If found indoors, gently relocate the spider outside using a cup and a piece of paper.
Habitat & Behavior
Habitat & Range
Found across North America and Europe, preferring wooded areas, forest edges, gardens, and overgrown fields where vegetation provides support for their large orb webs and protective retreats.
Behavior & Temperament
Generally docile and non-aggressive. They spend daylight hours concealed in a silken retreat connected to the web by a signal line, becoming active at dusk and night to monitor the orb web for vibrations from trapped prey.
Diet & Prey
Carnivorous, feeding primarily on flying insects such as flies, mosquitoes, moths, beetles, and wasps intercepted by the sticky spiral of the orb web.
Seasonal Activity
Peak activity and visibility occur in late summer and autumn when females reach full size, build prominent webs, and prepare for reproduction before dying off with the first hard frosts.
Description
The Marbled Orb-Weaver is one of the most vividly colored and fascinating spiders encountered in gardens and woodlands. With its bright orange pumpkin-like abdomen adorned with intricate dark marbling, this master architect constructs stunning vertical orb webs designed to catch passing nocturnal insects. As a beneficial predator, it plays a vital role in natural pest control while offering nature enthusiasts a brilliant display of arachnid diversity.
Key Features
Bulbous, brightly colored orange or yellow abdomen with dark marbling or facial patterns; distinctive dark and light banded legs; and the construction of a large vertical orb web with an attached leaf retreat.
Similar Species
Can be confused with other orb-weavers such as Araneus diadematus (Cross Orb-Weaver), which features a white cross pattern on the abdomen rather than the extensive orange marbling.
Life Cycle
Mates in autumn; females then construct a silken egg sac containing hundreds of eggs, which overwinter hidden in bark or leaf litter. Spiderlings hatch in spring, disperse via ballooning, and mature by late summer or autumn.
Ecological Importance
Serves as an effective natural controller of flying insect populations and provides a crucial food source for insectivorous birds and small mammals in the local food web.
Conservation Status
Not evaluated by the IUCN, but populations are widespread, stable, and common throughout their natural range.
Interesting Facts
Often referred to as the 'Pumpkin Spider' due to its bright orange coloration and peak maturity coinciding perfectly with the autumn season around Halloween.
Photography Tips
Best photographed in the early morning or evening when the spider is positioned centrally in its web or resting in its retreat. Use a macro lens with a fast shutter speed, side lighting to highlight web dew, and maintain a respectful distance to avoid disturbing the web.
Identified: 2026-09-06T20:32:45.109991