Neoscona arabesca

(Walckenaer, 1841)

Arabesque Orbweaver

Neoscona arabesca is a common -weaving found throughout North America, recognized by the distinctive swirling, brightly colored markings on its that give it the 'arabesque orbweaver.' Females build vertical orb webs 15–45 cm in diameter with 18–20 , occupying the hub at night and retreating to a curled leaf during the day. The has been to Nepal and China. It is a documented for the parasitic ichneumon Acrotaphus wiltii.

Neoscona arabesca by (c) Even Dankowicz, some rights reserved (CC BY), uploaded by Even Dankowicz. Used under a CC-BY license.

Neoscona arabesca by (c) Andy Reago & Chrissy McClarren, some rights reserved (CC BY). Used under a CC-BY license.

Neoscona arabesca (36981712712) by Melissa McMasters from Memphis, TN, United States. Used under a CC BY 2.0 license.

Pronunciation

How to pronounce Neoscona arabesca: //niːˈɒskoʊnə ærəˈbɛskə//

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

Identification

Distinguished from similar orbweavers by the prominent, swirling arabesque markings on the . The open hub of the web, crossed by only one or two threads, with the female resting with her abdomen tip pushed through this space at night, is a characteristic posture. abdominal pattern is more consistent than pattern and can help distinguish from . Differs from Neoscona crucifera (spotted orbweaver), which lacks distinct abdominal patterns and is larger (females 9–20 mm).

Images

Appearance

Females measure 5–7 mm in body length, males 5–6 mm. The is prominent and bears cryptic, brightly colored, swirling (arabesque) markings. The pattern is more consistent than the pattern and can aid identification. Overall coloration is variable but typically includes contrasting patterns that provide .

Habitat

Occurs in fields, forests, gardens, and on human structures. In agricultural systems, has been documented in soybean fields. Webs are typically built in vegetation or on structures at heights suitable for intercepting flying .

Distribution

to North America, including the United States and Canada. to Nepal and China. GBIF records indicate presence in Middle America and the Caribbean, though native status in these regions is unclear.

Seasonality

Active during warmer months; specific varies by latitude. In temperate regions, are most conspicuous in late summer and fall. One per year in temperate climates.

Diet

Primarily (), with relatively large numbers of also captured. In soybean fields, most captured are not considered agricultural pests. Feeding occurs primarily in the evening following web construction.

Host Associations

Acrotaphus wiltii - Ichneumon that the into brief paralysis and lays a single ; feeds externally on the spider

Life Cycle

Females construct sacs concealed in rolled leaves. Spiderlings emerge when day length and temperature are suitable for availability. In temperate regions, one per year with not ; spiderlings overwinter in egg sacs.

Behavior

Females build vertical webs 15–45 cm in diameter with 18–20 . At night, the female rests in the center of the orb with the tip of her pushed through the open hub space. During daytime, she hides in a retreat away from the web, typically inside a curled-and-tied leaf. Males do not build webs and are found in nearby foliage or hunting on the ground. Non-aggressive; bites to humans are rare and occur only when the is threatened.

Ecological Role

in natural and agricultural . In soybean fields, functions as a predator with potential for , though most captured are non-. Contributes to and serves as prey for - predators including parasitic .

Human Relevance

Bites are not medically significant; pain is short-lived and comparable to a . Considered in gardens and agricultural settings for control. Often observed near outdoor lighting where insects congregate. Non-aggressive disposition makes it generally harmless to humans and pets.

Similar Taxa

Neoscona cruciferaLacks distinct arabesque abdominal patterns; larger size (females 9–20 mm vs. 5–7 mm); markings on underside more consistent for identification but pattern less defined
Neoscona oaxacensisWestern spotted orbweaver with highly variable spotted patterns rather than swirling arabesque markings; larger size (females 11–17 mm); range primarily southwestern North America
Araneus cavaticusShares 'barn ' with N. crucifera but not N. arabesca; similar size and general orbweaver but lacks arabesque markings

More Details

Web Architecture

The hub of the web is open, crossed by only one or two threads, which the female uses as a resting position at night with her tip protruding through the space.

Male Web Loss

males lose the physical capacity to produce the of necessary for web construction upon sexual maturity, dedicating all energy to mate searching.

Parasitism Record

Documented as for Acrotaphus wiltii, an ichneumon that practices external on the .