Calliphora vicina

Distinguished from Calliphora vomitoria by bright orange cheeks versus duller coloration in the latter. Immature stages (eggs through pupae) are morphologically identical to C. vomitoria and require molecular or mass spectrometry methods for reliable separation. Direct Analysis in Real Time (DART) mass spectrometry has been developed to identify maggots of this species without rearing to adulthood.

Adults measure approximately 10–11 mm in length. The thorax and abdomen exhibit metallic blue-gray coloration. The cheeks (genae) are bright orange, a key distinguishing feature from the closely related Calliphora vomitoria. The sclerites at the base of the coxae are yellow or orange. Chaetotaxy includes black bristles on the meron and two to three bristles on the notopleuron.

Urban and suburban environments, particularly in association with human habitation. Frequently found near carrion, garbage, and organic waste. In stockfish production areas, the species exploits drying fish as a resource.

Native to and predominant in Europe and the New World (North America). Established in urban areas throughout the United States. Introduced to South Africa (first recorded 1965 near Johannesburg), Australia, and New Zealand. Dispersal occurs via harbors and airports.

Most abundant in early spring and fall when temperatures range 13–24°C (55–75°F). Active during winter months at lower temperatures than most other blow flies, with flight activity threshold at approximately 13–16°C (55–60°F). Less prevalent during warmer summer months when other blow fly species dominate.

Larvae feed on carrion, fresh animal tissue, and open wounds. Adults may visit dung and carrion for protein and nectar or honeydew for carbohydrates.

Females lay up to 300 eggs on fresh carrion or open wounds. Eggs hatch in approximately 24 hours. Larvae progress through three instars: first instar (~24 hours), second instar (~20 hours), third instar (~48 hours). Larval feeding lasts 3–4 days under favorable conditions. Post-feeding larvae disperse to pupate; pupal stage lasts approximately 11 days. Complete life cycle at 27°C takes about 18 days. Five generations per year possible at threshold temperature of 27°C. Development rate is temperature-dependent, with cooler temperatures extending duration.

Arrives at carrion 1–2 days after death, typically preceding Phaenicia sericata. Adults are active at night under certain conditions, though darkness delays oviposition compared to well-lit conditions. Flight activity occurs at lower temperature thresholds than other blow flies, enabling winter activity. Post-feeding larvae actively disperse from carrion to find pupation sites.

Primary decomposer of carrion and animal remains. Facilitates nutrient cycling through rapid tissue breakdown. Serves as a food source for predators and parasites. Indicator species for forensic investigations due to predictable colonization timing.

Critical forensic indicator for estimating minimum post-mortem interval, particularly in winter cases when other blow flies are inactive. Used in maggot debridement therapy for wound cleaning. Maggots are sold commercially as fish bait and for educational activities (Maggot Art). Research subject for studies on insect vision, flight mechanics, and developmental physiology.

• Calliphora vomitoriaOverlapping distribution and nearly identical immature stages; distinguished by duller facial coloration versus bright orange cheeks in C. vicina, and subtle differences in adult morphology.
• Phaenicia sericataBoth are forensically important blow flies; C. vicina arrives 1–2 days earlier and is active at lower temperatures, while P. sericata dominates in warmer seasons.
• Phormia reginaBlack blow fly with similar carrion association; distinguished by black or deep metallic blue-black coloration without the blue-gray thorax of C. vicina.

Long believed to be exclusively diurnal, but recent research demonstrates nocturnal activity under certain experimental conditions. Immature stages were historically considered identifiable by morphology, but are now known to be indistinguishable from C. vomitoria without molecular or chemical analysis.

• forensic entomology
• blow fly
• carrion
• decomposer
• urban
• winter active

• BugGuide
• Wikipedia
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
• Bohart Museum of Entomology Open House: Magnificent Maggot Art! | Bug Squad
• Maggot Art at UC Davis Picnic Day: Just Me and My Maggot | Bug Squad
• Primary Type List | Entomology Research Museum
• Advanced Mass Spectrometry Method Could Give Forensic Entomologists Faster Fly IDs
• In the Blink of a Fly: Flies' Upside-Down Landings Inspire Robot Designs
• Bug Eric: What's on Dat Scat?
• Calcium distribution during egg development in Calliphora vicina
• Phenology and life history of the blowfly Calliphora vicina in stockfish production areas
• Demonstration and Distribution of Carbohydrate-Containing Compounds in the Eye of the Blowfly Calliphora vicina (Diptera: Calliphoridae)
• Diptera in the Forensic Investigation of Human Deaths in Great Britain and the Dominant Role of Calliphora vicina (Calliphoridae) in Estimating a Minimum Post-Mortem Interval.