Araniella

Chamberlin & Ivie, 1942

Cucumber Spiders, Sixspotted Orbweaver

Araniella is a of small -weaver in the Araneidae, first described in 1942. The genus includes approximately 20 recognized distributed across the Palearctic and Nearctic regions, with notable species including A. cucurbitina (cucumber green spider) and A. displicata (sixspotted orbweaver). Members are characterized by green coloration due to biliverdin pigments, small body size (4–8 mm), and distinctive abdominal spotting patterns. Several species have been described recently, including A. villanii (2020) named after mathematician Cédric Villani.

Araniella displicata by (c) Michael Hohner (Mhohner), some rights reserved (CC BY). Used under a CC-BY license.

Araniella proxima by (c) Matt Muir, niektoré práva vyhradené (CC BY), uploaded by Matt Muir. Used under a CC-BY license.

Araniella displicata1 by R.Siloaho. Used under a Copyrighted free use license.

Pronunciation

How to pronounce Araniella: /ˌærəˈnɪɛlə/

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

Identification

Distinguished from other small -weavers by combination of green/ coloration, small body size, and paired black abdominal spots. A. displicata specifically identified by three (sometimes four) pairs of black dots on rear half of . Closely related A. cucurbitina and A. opisthographa require examination of epigynal —specifically length and distance between receptaculum and —for reliable separation; males distinguished by palpal morphology. A. alpica and A. inconspicua cannot be separated by CO1 due to shared haplotypes, requiring morphological examination of males.

Images

Habitat

Vegetated environments including woodlands, heath and heather fields, gardens, and yards. Webs frequently constructed across edges of single large leaves, positioned 4–6 feet above ground. Horizontal web orientation common, spanning foliage where () and other leaf-skittering occur. Sunflowers and similar vegetation with attract and consequently these .

Distribution

Widespread across Palearctic and Nearctic regions. North records primarily A. displicata, distributed across virtually entire continent including parts of Alaska. European distribution includes multiple with varying ranges: A. cucurbitina and A. opisthographa widespread; A. alpica in mountainous regions; A. maderiana restricted to Macaronesia. Asian distribution extends through Russia (Europe to Far East), Central Asia, Caucasus, Turkey, Iran, China, Korea, Japan, and Indian subcontinent. Recently described A. villanii ranges from southwestern Iran to eastern Kazakhstan and northern India.

Seasonality

A. displicata overwinters as , reaching adulthood late May to June in temperate North America (earlier in southern climates). Mating occurs shortly after maturity; sacs produced June–July. present from late spring through late summer; predominate from late summer onward. Other presumably follow similar seasonal patterns in temperate zones, though specific timing varies by latitude.

Life Cycle

Overwinters as . Reaches sexual maturity in late spring to early summer. Mating occurs shortly after maturity. Female constructs sac containing approximately 80 eggs, covered in loose fluffy yellowish ; deposited in curled leaf that serves as maternal retreat at web perimeter. Spiderlings emerge and develop through subsequent season, reaching subadult stage before winter.

Behavior

Constructs small webs relative to body size—typically 3–4 inches in diameter, notably smaller than webs of larger araneid relatives. Web positioned well above ground, frequently oriented horizontally across leaf edges. occupies hub position, hanging beneath horizontal webs or positioned -down in vertical webs. Web placement targets interception of that move between leaves, particularly .

Ecological Role

of small flying and leaf-dwelling ; web placement across vegetation edges exploits movement patterns of between foliage .

Human Relevance

Occur commonly in gardens and yards where they contribute to . Not dangerously venomous to humans or pets despite possessing . A. cucurbitina widely known as cucumber green in Europe. Subject of taxonomic research including integrative studies combining and molecular data.

Similar Taxa

AraneusLarger body size and substantially larger webs; lacks distinctive paired black abdominal spot pattern and green biliverdin-based coloration of Araniella
ZygiellaConstructs webs with characteristic missing sector; different abdominal patterning and epigynal
MangoraDifferent web architecture and patterns; distinct abdominal shape and coloration

More Details

Taxonomic complexity

-level identification within Araniella presents significant challenges. Females of A. cucurbitina and A. opisthographa are morphologically cryptic and frequently misidentified; reliable separation requires morphometric analysis of epigynal structures or examination of male . using CO1 fails to separate A. alpica and A. inconspicua due to shared haplotypes, demonstrating limitations of single-gene approaches even in small, morphologically homogeneous .

Recent species descriptions

Three described in 2020 from Caucasus, Middle East and Central Asia: A. villanii (named for mathematician Cédric Villani), A. mithra (named for Indo-Iranian light god Mithra), and A. maasdorpi. A. villanii is notably widespread for a newly described species, occurring across at least ten countries from Iran to Kazakhstan and India, highlighting substantial undescribed in well-studied groups.

Coloration mechanism

Green coloration results from biliverdin, a bile pigment, deposited in tissues—unusual among and providing effective against foliage. This biochemical differs from pigmentary coloration in many other green .