Cynomya

Large, robust blow flies with metallic coloration. Cynomya species can be distinguished from other calliphorid genera by their relatively large size and specific wing venation patterns, though precise identification typically requires examination of genital structures. Males possess relatively large, strongly sclerotized genitalia. The genus is characterized by a weak attraction to UV light compared to other blow flies such as Lucilia sericata and Phormia regina.

Associated with animal burrows and small mammal carcasses. Found in outdoor environments with access to decomposing animal matter; not strongly tied to human habitations. Laboratory colonies maintained successfully at 15-21°C with 16:8 photoperiod.

Primarily Palaearctic Region. C. mortuorum recorded in Europe including Belgium, with distribution extending to Alaska and the Russian Far East where ranges overlap with C. cadaverina. North American records include Vermont and scattered locations in the eastern and central United States. The genus is rarely abundant anywhere in its range.

Necrophagous; larvae develop on carrion. Adults require protein for ovarian development; in laboratory conditions, fed ad libitum on water, sugar, powdered milk, and beef heart.

Complete metamorphosis with egg, larva, pupa, and adult stages. For C. mortuorum at 22°C: egg-to-adult development averages 18.05 days for females and 18.47 days for males. The pupal stage represents approximately 56.7% of total development and lasts about 10.3-10.4 days. Pupal weight decreases approximately 8.75% during the first 8 days of pupation. Sexual size dimorphism present: female pupae average ~20% lighter than male pupae, with this difference persisting in adult dry weight.

Calm disposition in laboratory conditions, less easily disturbed than Lucilia sericata. Weak attraction to UV light, distinguishing this genus from many other calliphorids that are strongly phototactic to blacklight traps. Adults are active fliers and have been observed at blacklight sheets, though they are difficult to photograph due to rapid, erratic movement.

Forensic indicator species used in estimating post-mortem intervals and potentially detecting cadaver relocation. Agent of myiasis in mammals, recorded from hares. Contributes to carrion decomposition and nutrient cycling, though rarely abundant enough to be ecologically dominant in decomposition communities.

Limited forensic utility due to rarity in casework; less commonly encountered than other calliphorids such as Lucilia or Calliphora species. Not considered a significant pest or disease vector. Occasionally mistaken for the more common 'bluebottle' flies.

• LuciliaBoth are metallic blow flies in family Calliphoridae, but Lucilia species are generally smaller, more strongly attracted to UV light, and more easily disturbed in laboratory conditions.
• CalliphoraSimilar large size and metallic appearance, but Calliphora species typically show stronger synanthropic tendencies and different wing venation.
• PhormiaBoth genera contain blacklight-attracted blow flies, but Phormia species show strong UV attraction unlike the weak attraction observed in Cynomya.

• Calliphoridae
• blow fly
• forensic entomology
• necrophagous
• Palaearctic
• myiasis
• carrion
• UV light
• sexual dimorphism
• pupal development

• BugGuide
• Wikipedia
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
• Bug Eric: First Night of Blacklighting
• Bug Eric: April 2024
• Bug Eric: City Nature Challenge 2023 Recap
• Figure 1: The distribution of Cynomya mortuorum in Europe (source: http://www.gbif.org, 09/2016).
• Preliminary data on pupal development, lifespan and fertility of Cynomya mortuorum (L., 1761) in Belgium (Diptera: Calliphoridae)