Argiope bruennichi

(Scopoli, 1772)

Wasp Spider

Argiope bruennichi is an orb-weaving spider distinguished by bold yellow, white, and black abdominal banding resembling coloration. Females reach 14–20 mm body length, while males average only 4.5 mm—one of the most extreme sexual size dimorphisms among spiders. The builds spiral orb webs with a central zigzag silk decoration () of debated function. Native to southern Europe and parts of Asia and Africa, it has undergone significant northward range expansion since the 1990s, now occurring throughout much of northern Europe including the UK and Poland.

Argiope bruennichi by (c) Thomas Bresson, some rights reserved (CC BY). Used under a CC-BY license.

Wasp spider (Argiope bruennichi) - geograph.org.uk - 5106592 by Keith Edkins . Used under a CC BY-SA 2.0 license.

Argiope bruennichi dorsal ventral by wikipedia. Used under a CC BY-SA 3.0 license.

Pronunciation

How to pronounce Argiope bruennichi: /ˈɑːr.dʒi.oʊp ˈbrɛn.nɪ.ki/

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

Identification

Distinguished from other Argiope by the specific pattern of yellow, white, and black abdominal stripes. In Europe, most similar to Argiope aurantia (not native to Europe) and Argiope trifasciata; A. bruennichi differs from A. trifasciata in having more yellow (vs. silver) ground color and different banding pattern. The is typically vertical/linear rather than X-shaped. Extreme in size is diagnostic for the but not species-specific.

Images

Appearance

females have a large, oval with striking transverse bands of yellow, white, and black. The is silvery-white. Legs show alternating light and dark banding. Males are dramatically smaller (4.5 mm vs. 14–20 mm), with less vivid coloration and more slender proportions. The abdomen bears a pattern that mimics the warning coloration of vespid .

Habitat

Constructs orb webs in open, sunny with tall vegetation, most commonly in grasslands, meadows, and agricultural fields. Webs are built 0–50 cm above ground level, typically in long grass or herbaceous vegetation. Prefers warm, sheltered locations with adequate prey traffic. In northern parts of its expanding range, found in similar open grassland and field edge habitats.

Distribution

Native to Mediterranean and Pontian regions of southern Europe, extending through central Europe, north Africa, and parts of Asia. Undergoing rapid northward expansion; now established throughout Poland, Germany, the UK (first recorded 1922, spreading since 2006), and other northern European countries. Also occurs on the Azores archipelago. Isolated records from North America (Ohio) likely represent introductions or vagrant individuals.

Seasonality

present during summer months, with peak activity July–August in northern Europe. Males mature earlier and search for females; timing varies with latitude due to range expansion. In southern parts of range, may have longer activity period.

Diet

Captures flying insects in orb web. Prey includes Diptera (60%), Hymenoptera (14%), Orthoptera (12%), and Hemiptera (11%), with larger proportion of medium (4–10 mm) and large (>10 mm) prey items compared to sympatric orb-weavers. Prey is wrapped in silk, then bitten and injected with paralyzing venom and protein-dissolving .

Life Cycle

with as . Females produce egg sacs in late summer; one recognized (A. b. nigrofasciata in Portugal). Offspring survival improved when females consume dietary , which may be sequestered from prey and transferred to eggs.

Behavior

Builds spiral orb web at dawn or dusk. Constructs vertical zigzag at web center; function unclear but webs with stabilimenta damaged less often by birds. When approached, may flex legs to set web into rapid vibration, blurring the spider's image as defensive response. Males wait near female webs and rush to mate immediately after female's final moult when are temporarily soft, reducing risk from 80% to 3%. Males use mating plugs (broken ) to block female genital openings, limiting males to two matings and enforcing monogamy.

Ecological Role

of flying insects in grassland . Range expansion in northern Europe alters local orb-weaver spider composition; appears to compete with native , though displacement mechanisms not fully characterized. Potential biocontrol agent in orchards and grasslands.

Human Relevance

Generally harmless to humans; venom not medically significant. Bites only if handled carelessly. Valued in some European orchards for insect pest suppression. Subject of extensive research due to remarkable mating system, sexual , and range expansion . Popular among naturalists and photographers for striking appearance.

Similar Taxa

Argiope trifasciataBanded garden spider with similar size and orb-web ; differs in having silver (not yellow) ground color on , spotted legs, and X-shaped (not vertical) pattern.
Argiope aurantiaBlack and yellow garden spider with similar color pattern; North American not overlapping in native range, but both show yellow/black abdominal banding and vertical .