Lucilia cuprina

(Wiedemann, 1830)

Australian sheep blowfly, bronze bottle fly

, commonly known as the , is a member of the Calliphoridae. It is a significant agricultural pest in sheep-rearing regions, causing the condition known as fly strike or myiasis. The has been introduced to multiple continents through human commerce and is also utilized in for estimating postmortem intervals. are characterized by their metallic green or greenish-blue with bronze or coppery reflections.

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Australian sheep blowfly by wikipedia. Used under a GFDL 1.2 license.

Pronunciation

How to pronounce Lucilia cuprina: /luˈsɪliə ˈkuːprɪnə/

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

Identification

is most reliably distinguished from by microscopic examination of the occipital setae. It is almost indistinguishable from its Lucilia sericata based on external alone. Key identifying features include strong setae and a black thoracic . Differentiation from L. sericata requires microscopic analysis of occipital setae; L. cuprina typically infests live sheep while L. sericata does not. L. cuprina is associated with drier climates compared to the coastal distribution of L. sericata.

Images

Appearance

exhibit a metallic outer appearance with a shiny green or greenish-blue displaying bronze or coppery reflections, earning the 'bronze bottle fly.' Body length ranges from 4.5–10 mm with a round to oval body shape. The features reddish . Two pairs of wings are present: the first pair consists of membranous wings, while the second pair is reduced to used for stabilization. Bristles are present on the meron, and the (prominent hair on the terminal antennal segment) is or feathery. The possesses strong setae and a black thoracic .

Habitat

prefers warmer conditions with soil temperatures above 15°C and air temperatures between 17°C and 40°C. It favors low wind conditions with speeds below 30 km/h. are found in bright, open areas, while larvae occur in shaded regions of carrion. The thrives in dry climates and is commonly associated with agricultural landscapes where sheep are present. It has been observed feeding on honeydew produced by aphids in urban tree .

Distribution

Native to Afrotropical and Oriental regions. Established in Australia where it causes significant economic damage to sheep industries. Present in Africa, North America (including Hawaii and the conterminous 48 United States), and South America (Brazil: Acre, Amapá, Distrito Federal, Goiás, Maranhão, Minas Gerais, Mato Grosso do Sul, Mato Grosso, Pará, Paraíba, Paraná, Rio de Janeiro, Rio Grande do Norte, Rondônia, Rio Grande do Sul, Santa Catarina, São Paulo). Also recorded in Lesotho and Namibia. The ' wide distribution results from human-mediated through livestock movement and commerce over the last century.

Seasonality

Activity is temperature-dependent, occurring when soil temperatures exceed 15°C and air temperatures range between 17°C and 40°C. In suitable climates, the can complete 4–8 per year. arrive at carrion within minutes to hours after death, making them among the earliest colonizers of decomposing remains.

Diet

feed on diverse substrates including carrion and decaying fruit. They have been observed feeding on honeydew produced by aphids. Larvae feed on carrion, with a notable habit of infesting living sheep (myiasis), consuming living flesh and secreting ammonia in the process. , protein, and salts are essential for development; in laboratory conditions, egg development has been supported by casein, milk, yeast, egg albumen, and gelatin plus L-tryptophan, though more slowly than on liver. Sheep droppings may provide adequate food for egg development, particularly from sheep on improved pastures during spring and autumn.

Host Associations

sheep - primary for myiasis (fly strike)Female flies locate sheep with open wounds or fecal/urine accumulation in wool to lay ; larvae cause cutaneous myiasis with that may be fatal if untreated. Ewe lambs and female sheep are primarily affected in the rear quadrant due to fecal staining.

Life Cycle

The comprises , larva, pupa, and stages. Adults arrive at carrion or suitable oviposition sites within minutes to hours. Eggs hatch into larvae that feed and grow for approximately five days before entering the pupal stage. The pupal stage involves from larva to adult without feeding. Total development from egg to adult requires 11–21 days depending on temperature and food availability, with higher temperatures and better nutrition accelerating development. The produces 4–8 annually depending primarily on temperature.

Behavior

females actively locate sheep with specific conditions—open wounds or accumulation of or urine in wool—for oviposition. Adults can fly up to 16 km (10 miles) in search of food. Larvae prefer shaded regions within carrion while adults occupy bright, open areas. Larvae excrete ammonia as their primary nitrogenous waste, with increasing during larval growth and diminishing rapidly as approaches. The is among the first blow flies to colonize carrion, often arriving within minutes of death.

Ecological Role

serves as an early colonizer of carrion, contributing to decomposition processes. It functions as prey for various ; jumping spiders (Salticidae) have been documented stalking and killing Lucilia . The has been observed feeding on honeydew, potentially serving as a food source for natural enemy in urban landscapes. Larvae are used in maggot debridement therapy for wound cleaning in medical applications.

Human Relevance

Major agricultural pest causing fly strike (myiasis) in sheep, resulting in severe economic losses and animal welfare concerns. cause severe discomfort, stress, and potential death in untreated animals. Control measures include crutching, shearing, tail docking, pizzle dropping, mulesing, and application, though resistance and welfare concerns complicate management. Significant forensic importance: used to estimate postmortem intervals based on life stage presence on corpses, and its climate specificity (dry climates) can indicate corpse relocation. Larvae are employed in maggot debridement therapy for cleaning necrotic wounds and preventing gangrene.

Similar Taxa

Lucilia sericataExtremely similar external ; distinguished only by microscopic examination of occipital setae. L. sericata has coastal distribution and does not typically infest live sheep, whereas L. cuprina is a worldwide sheep pest associated with dry climates.

More Details

Maggot debridement therapy

larvae have been used medically for debridement therapy to clean necrotic tissue from slow-healing wounds, preventing gangrene and further . This application is less common than the use of Lucilia sericata for the same purpose.

Ammonia excretion physiology

Larvae excrete the bulk of nitrogenous waste as ammonia, with rates peaking during full larval growth and diminishing rapidly before . This ammonia secretion contributes to poisoning of sheep during myiasis .

Climate and forensic inference

The ' preference for dry climates allows forensic investigators to infer potential corpse relocation when L. cuprina is found in moist environments, as this indicates the remains were likely moved from an original dry location.