Coccinella septempunctata

Linnaeus, 1758

seven-spot ladybird, seven-spotted ladybug, seven-spotted lady beetle, C-7

Coccinella septempunctata is a predatory to Europe, Asia, and North Africa, now widely established in North America following intentional introduction for . measure 6.5–7.8 mm with distinctive red bearing seven black spots. The is among the most extensively studied due to its importance in and its success in new ranges. It completes up to five annually with a six-week development cycle from to adult.

Coccinella septempunctata by (c) Alexis Tinker-Tsavalas, some rights reserved (CC BY), uploaded by Alexis Tinker-Tsavalas. Used under a CC-BY license.

Coccinella septempunctata by (c) Casey H. Richart, some rights reserved (CC BY), uploaded by Casey H. Richart. Used under a CC-BY license.

Coccinella septempunctata by (c) Gianni Del Bufalo bygdb, some rights reserved (CC BY), uploaded by Gianni Del Bufalo bygdb. Used under a CC-BY license.

Pronunciation

How to pronounce Coccinella septempunctata: //ˌkɒksɪˈnɛlə ˌsɛptɛmˈpʌŋktətə//

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

Identification

Distinguished from other Coccinella by the consistent pattern of seven black spots on red with the medial spot at the junction. Spot fusions and melanic forms are rare. Coccinella novemnotata has nine spots; Coccinella trifasciata has transverse rather than spots. The pronotal spots and body proportions separate it from Harmonia axyridis, which is highly variable in coloration and spot pattern.

Images

Habitat

Temperate regions with abundant vegetation and . Found in forests, grasslands, agricultural fields, marshes, suburban parks, and gardens. plants include , , trees, and shrubs. Occurs from sea level to 1,500 m elevation. sites include under tree bark, boulders, hedgerows, dense grass, and leaf litter, with preference for elevated areas like hilltops.

Distribution

to Europe (including British Isles and European Russia), most of Asia (Middle East, China, Japan, Koreas, India, Pakistan), and North Africa. to North America (United States and Canada) and South Africa. Established throughout North America following accidental introduction near New York in 1973.

Seasonality

Active during spring and summer; in winter. emerge from as temperatures rise, with timing varying by shelter. Breeding begins late spring. Multiple occur annually in favorable climates. Mass swarming events observed during explosions, notably in England during heatwaves.

Diet

Specialized ; requires aphids for development and . Consumes at least 24 aphid . Laboratory studies identify Lipaphis erysimi as optimal and as least suitable. When aphids are scarce, survive on pollen, nectar, , , and other alternative foods but cannot reproduce on these. may engage in intraguild and when aphid availability is low.

Life Cycle

with four stages: , four larval , , and . Eggs orange-, spindle-shaped, 1 mm long, laid in clusters of 10–30 on vegetation. Incubation approximately four days, temperature-dependent. hatch at 1–2 mm, reaching 8 mm by fourth instar; coloration varies with temperature, generally black with pale and orange on abdominal 1 and 4. Pupal stage lasts about eight days. Total development from egg to adult approximately six weeks. Adults live 1–2 years. Up to five annually.

Behavior

activity pattern. aggregate in clusters during for and mate availability. Emits 2-isopropyl-3-methoxy-pyrazine to attract to sites. Uses olfactory cues to locate and avoid ovipositing where conspecific are present. Females release volatile to attract males. Exhibits from leg joints when threatened, releasing toxic alkaloids (N-oxide coccinelline and precoccinelline). Limb capacity during pupal stage is near 100%.

Ecological Role

providing in agricultural and natural . Serves as for birds, small mammals, , and other . to including Dinocampus coccinellae and Perilitus coccinellae, and ectoparasitic Allothrombium triticium. In ranges, competes with and displaces coccinellid through resource competition and intraguild .

Human Relevance

Widely used in programs for management in agriculture. Mass-reared for release on . Accidental introduction to North America established permanent . Designated national of Finland and official state insect of Massachusetts, New Hampshire, Delaware, Ohio, and Tennessee. Featured on postage stamps of multiple countries. Population explosions can cause nuisance . Presence in vineyards contributes to " taint" in wine from 2-isopropyl-3-methoxypyrazine . Cultural significance includes association with Virgin Mary in European folklore, with seven spots representing seven joys and sorrows.

Similar Taxa

Harmonia axyridisHighly variable coloration and spot pattern (0–19 spots), larger size, more aggressive competitive ; C. septempunctata has consistent seven-spot pattern and smaller, more uniform appearance
Coccinella novemnotata to North America with nine spots rather than seven; historically common but now rare due to competition from including C. septempunctata
Coccinella trifasciataTransverse black on rather than discrete spots; to North America where it has evolved to toxic that C. septempunctata avoids

Misconceptions

Popular belief that the seven spots represent the seven joys and sorrows of the Virgin Mary is folkloric rather than biological. sensationalism regarding sexually transmitted in conflates research on Harmonia axyridis with other ; no evidence of such transmission from C. septempunctata to other species.