Coccinellidae

Latreille, 1807

Lady Beetles, Ladybird Beetles, Ladybugs, Ladybirds

Subfamily Guides

6

is a widespread of small beetles comprising over 6,000 described with global distribution. Members range from 0.8 to 18 mm in size, typically oval with domed backs and flattened undersides. The family exhibits diverse feeding strategies: most species are predatory on aphids and scale insects, while others feed on fungi or plants. Many species display conspicuous aposematic coloration, commonly red or orange with black spots, warning of their chemical defenses. The family has significant economic importance as agents and, conversely, as occasional household pests and agricultural nuisances.

Aphidecta by (c) Michael Hansen, some rights reserved (CC BY), uploaded by Michael Hansen. Used under a CC-BY license.Exochomus by (c) Alan Manson, some rights reserved (CC BY), uploaded by Alan Manson. Used under a CC-BY license.Rhyzobius forestieri by (c) Matteo Marcandella, some rights reserved (CC BY), uploaded by Matteo Marcandella. Used under a CC-BY license.

Pronunciation

How to pronounce Coccinellidae: //ˌkɒksɪˈnɛlɪdiː//

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

Identification

Distinguished from other by combination of: oval, strongly convex body shape; short, clubbed ; concealed beneath broad prothorax; and distinctive spotted or patterned . Separation from similar families within Coccinelloidea requires examination of internal head structures ( with separated branches, no frontoclypeal ), five pairs of abdominal , and specific coxal cavity orientation. Specific identification within the family is challenging due to extreme intraspecific variation in spot patterns; pronotal markings often more reliable than elytral spot counts. For example, Coccinella septempunctata (seven-spotted) has only white corners on the pronotum, while Coccinella novemnotata (nine-spotted) has a complete white pronotal collar.

Images

Appearance

are oval beetles with strongly convex, domed backs and flattened undersides. Size ranges from 0.8 to 18 mm. They possess hardened, non-overlapping forewings () that cover the hindwings when not in . The elytra display distinctive color patterns—typically light (yellow, red, orange, or brown) with dark spots, or dark with light spots—created by carotene and melanin pigments. Some exhibit stripes, checkered patterns, or . The is partially concealed by a broad, convex prothorax. are clubbed with seven to eleven segments. Legs are relatively short with tarsal formula 4-4-4 (appearing 3-3-3 due to reduced third segment) and two claws at the tip. Larvae are elongated with square heads, covered in setae, and vary in color from grey to brown with white, yellow, red, or orange spots.

Habitat

Occurs in diverse terrestrial including agricultural crops, forests, grasslands, gardens, and urban environments. Many are associated with vegetation where prey or plants occur. Some species occupy extreme environments: high mountains, arid deserts, and cold regions. form in protected locations such as under rocks, in grass tussocks, or within human structures.

Distribution

Found on every continent except Antarctica. Native occur across all major biogeographic regions. Several have been introduced outside native ranges for , including Harmonia axyridis (native to East Asia, now established in North America, Europe, and Africa) and Coccinella septempunctata (native to Europe, introduced to North America).

Seasonality

Activity patterns vary by climate. In temperate regions, occurs from late spring to early summer; some show extended breeding in spring, fall, and winter in warmer temperate zones. Tropical species reproduce during wet seasons. Temperate species enter hibernation or during winter; tropical species experience dormancy during dry seasons. between dormancy and breeding sites occurs seasonally.

Diet

Feeding habits are diverse across the . Approximately 68% of temperate and 20% of species worldwide are . Around 36% of species feed primarily on scale insects. Some species are : Stethorus species prey exclusively on spider mites. Non-predatory species include mycophagous feeders (fungi), particularly tribe Halyziini, and phytophagous species such as Epilachna and Henosepilachna that feed on plants. Many predatory species supplement diets with pollen, nectar, sap, honeydew, or fungi. Larvae and typically share the same food sources.

Life Cycle

Complete with four stages: , larva, pupa, and . Eggs are typically bright yellow, laid upright in clusters near food sources; clutch size varies from double digits to over 1,000 eggs per female lifetime. Some lay infertile as backup food for larvae. Larvae pass through four instars with three . Pupae may be uncovered, partially covered, or fully covered by larval skin; mostly immobile with limited movement. Development time varies by climate and species: for Adalia bipunctata, eggs hatch in 4–8 days, larval stage lasts ~3 weeks, and pupal stage 7–10 days. Adults develop much coloration within hours but may take weeks or months to fully darken. Adult lifespan reaches up to one year. Multiple per year occur in favorable conditions; some species have single generations.

Behavior

activity with springy hindwing that stiffen in flight. Capable of long-distance : documented flights up to 120 km at speeds of 30 km/h, reaching altitudes near 1,100 m. Aggregates for in clumps of varying size by . Exhibits at all life stages, including larvae consuming or other larvae and feeding on any life stage. Defensive releases toxic alkaloids and pyrazines from tibio-femoral joints when disturbed. Limb during pupal stage has been documented across the , with near-universal capacity in some species (Coccinella septempunctata, Harmonia axyridis).

Ecological Role

Predatory serve as important agents of agricultural and forest pests, particularly aphids, scale insects, whiteflies, psyllids, and adelgids. Act as prey for birds, spiders, ants, lacewings, and other . Serve as for including flies, ticks, mites, hymenopterans, and , as well as bacterial, fungal, and protozoan . Some species contribute to nutrient cycling through or detritivory. such as Harmonia axyridis can disrupt native coccinellid through competition and intraguild .

Human Relevance

Valued as agents since at least 1814; Novius cardinalis (vedalia beetle) introduced to California in 1887 for cottony cushion scale control is considered a textbook success. -feeding generally more successful as biocontrol agents than due to their specificity and slower matching prey. Some species are household nuisances, particularly Harmonia axyridis, which aggregates in buildings for and may deliver minor bites. Can cause "ladybird taint" in wine when present during processing. Mexican bean beetle (Epilachna varivestis) and related species are agricultural pests of legumes. Hold cultural significance in folklore, religion, and nursery rhymes across many societies, associated with luck, love, , and prophecy.

Similar Taxa

  • Chrysomelidae (leaf beetles)Some brightly colored resemble coccinellids, but lack the strongly domed body shape and short, clubbed . Coccinellids are distinguished by concealed and specific tarsal structure.
  • Endomychidae (handsome fungus beetles)Share similar oval body shape and some color patterns, but differ in antennal structure and lack the distinctive pronotal shape of coccinellids.

Misconceptions

Despite containing "," coccinellids are beetles (Coleoptera), not true bugs (Hemiptera). The term "ladybug" is discouraged by entomologists in favor of "lady beetle" or "ladybird beetle." Spot counting is unreliable for identification due to extreme intraspecific , particularly in Harmonia axyridis. Not all coccinellids are beneficial ; some species are plant pests or household nuisances. The "bite" of Harmonia axyridis is generally a minor nip without skin penetration, not a true bite in the predatory sense.

More Details

Limb Regeneration

A 2021 study found limb during pupal stage is widespread in , with average Limb Regeneration Index of 0.598 across 14 . Coccinella septempunctata and Harmonia axyridis showed regeneration in nearly 100% and 98% of individuals respectively. of H. axyridis showed 20% higher regeneration rates than native Asian populations, suggesting correlation between regenerative capacity and ecological competitiveness. The trait likely persists due to effects of developmental genes rather than direct selection, as limb damage is rarely survived in nature.

Chemical Defenses

Haemolymph contains at least 50 types of alkaloids, azamacrolides, polyamines, and foul-smelling pyrazines. A 2015 study confirmed that color contrast with background honestly signals — with greater contrast are more toxic. Some clerid beetles (Enoclerus species) appear to sequester coccinellid toxins for their own defense, representing possible Müllerian or relationships.

Invasive Species Impact

Harmonia axyridis has been implicated in declines of native coccinellid on oceanic islands and in North America. The was deliberately introduced to the United States beginning in 1916, established by the mid-1980s, and now ranges from Florida to Washington State. Its success as a biocontrol agent is complicated by its tendency to invade buildings, bite humans, and disrupt native lady beetle .

Sources and further reading