Cynomya cadaverina

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Cynomya cadaverina
Blowfly - Cynomya cadaverina, Meadowood Farm SRMA, Mason Neck, Virginia.jpg
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Diptera
Family: Calliphoridae
Genus: Cynomya
Species:
C. cadaverina
Binomial name
Cynomya cadaverina
Synonyms
  • Cynomyopsis cadaverina

Cynomya cadaverina, also known as the shiny blue bottle fly, is a member of the family Calliphoridae, which includes blow flies as well as bottle flies. In recent years, this family has become a forensically important facet in many medicocriminal investigations in the growing field of forensic entomology. C. cadaverina is specifically important in determining a post-mortem interval, as well as other important factors.

Contents

Taxonomy

Cynomya cadaverina was first described in 1830 by the French entomologist Jean-Baptiste Robineau-Desvoidy. Its epithet cadaverina is derived from the Latin word, meaning ‘(that feed on) dead bodies.’ [1] This species is a member of the order Diptera and the diverse family Calliphoridae.

Description

C. cadaverina is a fairly large species, ranging anywhere from 9-14 millimeters long. and has many characteristics that are common to its family, Calliphoridae. [2] These characteristics include their metallic color, having bristles on their meron as well as having plumose arista. [3] This species is known for having a shiny metallic blue abdomen for which it is named. It has a dark blue or black thorax and distinctive darker blue stripes present on the dorsum behind its head. [4] Along with these other characteristics, C. cadaverina also has white calypters, a bare stem vein, and a parafacial with a ground color ranging from black to reddish brown with a yellow covering. [5]

Distribution

Cynomya cadaverina is known to range throughout the Neartic region with it being found mostly in southern Canada but also in the northern United States. Despite their normal location, they have also been found in states as far south as Florida and Texas. [4] This species is known as a cool weather species and colonizes carrion in the highest numbers in the spring and fall months. In most cases, they overwinter as adults and may enter into houses during that time. [6]

Life cycle and development

Members of the order Diptera have a holometabolous lifecycle, meaning they go through four life stages: egg, larva, pupa and imago, or adult. C. cadaverina typically has around 17 generations of offspring per year with 25 to 50 eggs per generation if the right conditions are present. [2] [7] Temperature can have an extreme impact on development. If the temperature gets above or below a certain temperature it can cause all development of the fly to stop. In general, the warmer it is, the faster the lifecycle will go; while if it is colder, the lifecycle may take longer than usual. This has to be taken into account when estimating the postmortem interval.

Adults of C. cadaverina lay their eggs in open wounds or natural body openings on carrion, typically in small clusters or scattered singly. [8] The eggs usually hatch out within 24 to 72 hours depending on the season. [2] The eggs will then hatch into larvae that will go through three instars (stages). Each one of these stages is separated by a molt. During a molt, the larvae shed its outer layer in order to accommodate for new growth that comes with increased consumption of food needed for energy stores. The first instar typically lasts for approximately 20 hours, while the second instar lasts for 16 hours followed by the third instar for 72 hours. After the larvae have completed their development and stored as much energy as possible, they disperse to a safe area to complete their next stage, the pupal stage. This stage lasts for about 9 days before the fly finally emerges as an adult. The total lifecycle of C. cadaverina can take anywhere from 17–19 days depending on the temperature. [7]

Forensic and medical importance

Post-mortem interval estimation

PMI estimation is used to figure out how much time has elapsed since a person died by using insects to help estimate this interval. It depends on the species of insect, as some are attracted to fresh corpses while others are only attracted to the putrid and advanced stages of decomposition. This means the insects go through waves of succession. Using this information as well as the lifecycle of the insect in question can help to estimate the PMI. The judgment depends on what stage of development the insect is in, as well as the weather in recent months among other factors. Specifically with C. cadaverina, they tend to be attracted to fairly advanced stages of decomposition, while rarely being found on fresh carrion. [4] They also tend to be in the second wave of succession, usually showing up after Lucilia spp. and Calliphora spp. [7]

Myiasis and maggot therapy

Myiasis is the infestation of living or necrotic tissue in a living host by fly larvae. Some flies may just lay their eggs in a festering wound, while other may infest unwounded tissue. [9] C. cadaverina has occasionally been found in cases of myiasis but is not a fly that is regularly found. Myiasis is fairly uncommon in the United States, but tends to be very common in third world countries and can create a major problem with livestock, causing severe economic losses. Myiasis is different from maggot therapy in which physicians purposely use larvae of flies that feed on necrotic tissue in order to clean up a wound and aid healing. Maggot therapy can clean up a wound that has been festering for months very quickly.

Mitochondrial DNA analysis

In recent years, there have been numerous research projects on the topic of mitochondrial DNA analysis in fly larvae. In cases where larvae have fed on human tissue, these larvae are collected and then the gut is dissected out. The mitochondrial DNA from the gut is analyzed and can lead to the identification of the corpse the maggot was feeding on as well as the species of the maggot itself. [10] This information could be critical if the body was too decomposed to lead to identification, or in other situations where identification would be near to impossible. Research concerning mitochondrial DNA analysis is currently being conducted on C. cadaverina in order to aid in investigations.

Disease transmission

Cynomya cadaverina has been found to demonstrate communicative behavior via clustering and aggregation. It has been described by the U.S. Food and Drug Administration as being a part of the "filthy fly" category, as it tends to breed in excrement and thrives in filthy habitats. This fly can also pose a health hazard due to the transmission of enteric pathogens that can lead to foodborne diseases in humans. [11]

Future research

Further research is being conducted on Cynomya cadaverina to gain more information on its lifecycle as well as its behavior in order to better pinpoint time of death with postmortem interval estimation. This information will further aid forensic entomologists as well as investigators in solving medicocriminal investigations. Also, continued research on mitochondrial DNA analysis will be able to provide more identifications in cases where identification may have seemed impossible. Although Cynomya cadaverina is not as forensically or medically important as some of the other species of fly, it can still be a powerful tool in investigations as well as aid in maggot therapy.

Related Research Articles

<span class="mw-page-title-main">Calliphoridae</span> Family of insects in the Diptera order

The Calliphoridae are a family of insects in the order Diptera, with almost 1,900 known species. The maggot larvae, often used as fishing bait, are known as gentles. The family is known to be polyphyletic, but much remains disputed regarding proper treatment of the constituent taxa, some of which are occasionally accorded family status.

<span class="mw-page-title-main">Common green bottle fly</span> Species of insect

The common green bottle fly is a blowfly found in most areas of the world and is the most well-known of the numerous green bottle fly species. Its body is 10–14 mm (0.39–0.55 in) in length – slightly larger than a house fly – and has brilliant, metallic, blue-green or golden coloration with black markings. It has short, sparse, black bristles (setae) and three cross-grooves on the thorax. The wings are clear with light brown veins, and the legs and antennae are black. The larvae of the fly may be used for maggot therapy, are commonly used in forensic entomology, and can be the cause of myiasis in livestock and pets. The common green bottle fly emerges in the spring for mating.

<i>Cynomya mortuorum</i> Species of fly

Cynomya mortuorum belongs to the order Diptera, sometimes referred to as "true flies". In English, the only common name occasionally used is "fly of the dead". It has a bluish-green appearance, similar to other Calliphoridae and is found in multiple geographic locations with a preference for colder regions. Belonging to the family Calliphoridae, it has been shown to have forensically relevant implications due to its appearance on carrion. Current research is being done to determine C. mortuorum's level of importance and usage within forensic entomology.

<i>Calliphora vomitoria</i> Species of fly

Calliphora vomitoria, known as the blue bottle fly, orange-bearded blue bottle, or bottlebee is a species of blow fly, a species in the family Calliphoridae. Calliphora vomitoria is the type species of the genus Calliphora. It is common throughout many continents including Europe, Americas, and Africa. They are fairly large flies, nearly twice the size of the housefly, with a metallic blue abdomen and long orange setae on the gena.

<i>Chrysomya</i> Genus of flies

Chrysomya is an Old World blow fly genus of the family Calliphoridae. The genus Chrysomya contains a number of species including Chrysomya rufifacies and Chrysomya megacephala. The term “Old World blow fly” is a derivative of both the associated family, Calliphoridae, and the belief that the genus Chrysomya originated in Asia and migrated to North America only relatively recently. Chrysomya’s primary importance to the field of medico-criminal forensic entomology is due to the genus’ reliable life cycle, allowing investigators to accurately develop a postmortem interval. Chrysomya adults are typically metallic colored with thick setae on the meron and plumose arista. The name comes from the word chrysos, meaning “golden” in reference to the metallic sheen of the genus’ species, and -mya, a derivation from the word myia, meaning “fly”.

<i>Chrysomya rufifacies</i> Species of fly

Chrysomya rufifacies is a species belonging to the blow fly family, Calliphoridae, and is most significant in the field of forensic entomology due to its use in establishing or altering post mortem intervals. The common name for the species is the hairy maggot blow fly, and it belongs to the genus Chrysomya, which is commonly referred to as the Old World screwworms. This genus includes other species such as Chrysomya putoria and Chrysomya bezziana, which are agents of myiasis. C. rufifacies prefers very warm weather and has a relatively short lifecycle. It is widely distributed geographically and prefers to colonize large carcasses over small ones. The species commonly has a greenish metallic appearance and is important medically, economically, and forensically.

Forensic entomological decomposition is how insects decompose and what that means for timing and information in criminal investigations. Medicolegal entomology is a branch of forensic entomology that applies the study of insects to criminal investigations, and is commonly used in death investigations for estimating the post-mortem interval (PMI). One method of obtaining this estimate uses the time and pattern of arthropod colonization. This method will provide an estimation of the period of insect activity, which may or may not correlate exactly with the time of death. While insect successional data may not provide as accurate an estimate during the early stages of decomposition as developmental data, it is applicable for later decompositional stages and can be accurate for periods up to a few years.

<i>Lucilia illustris</i> Species of insect

Lucilia illustris is a member of the fly family Calliphoridae, commonly known as a blow fly. Along with several other species, L. illustris is commonly referred to as a green bottle fly. Lucilia illustris is typically 6–9 mm in length and has a metallic blue-green thorax. The larvae develop in three instars, each with unique developmental properties. The adult fly typically will feed on flowers, but the females need some sort of carrion protein in order to breed and lay eggs.

<i>Phormia regina</i> Species of fly

Phormia regina, the black blow fly, belongs to the blow fly family Calliphoridae and was first described by Johann Wilhelm Meigen.

<i>Chrysomya albiceps</i> Species of fly

Chrysomya albiceps is a species belonging to the blow fly family, Calliphoridae.

<i>Chrysomya megacephala</i> Species of fly

Chrysomya megacephala, more commonly known as the oriental latrine fly or oriental blue fly, is a member of the family Calliphoridae (blowflies). It is a warm-weather fly with a greenish-blue metallic box-like body. The fly infests corpses soon after death, making it important to forensic science. This fly is implicated in some public health issues; it can be the cause of myiasis, and also infects fish and livestock.

<i>Sarcophaga pernix</i> Species of fly

Sarcophaga pernix, also known as the red-tailed flesh fly, is a fly in the Sarcophagidae family. This fly often breeds in carrion and feces, making it a possible vector for disease. The larvae of this species can cause myiasis, as well as accidental myiasis. It is potentially useful in forensic entomology.

Lucilia thatuna belongs to the family Calliphoridae, the species most commonly referred to as the blowflies, and the genus Lucilia. Along with several other species of Lucilia, L. thatuna is commonly referred to as a green bottle fly. L. thatuna is very scarce and not much is known about this particular fly. It has been noted to reside in mountainous regions of the northwestern United States.

<i>Lucilia cuprina</i> Species of fly

Lucilia cuprina, formerly named Phaenicia cuprina, the Australian sheep blowfly is a blow fly in the family Calliphoridae. It causes the condition known as "sheep strike"'. The female fly locates a sheep with ideal conditions, such as an open wound or a build-up of faeces or urine in the wool, in which she lays her eggs. The emerging larvae cause large lesions on the sheep, which may prove to be fatal.

Compsomyiops callipes, previously known as Paraluclia wheeleri, is a member of the blowfly family Calliphoridae. It is a warm weather fly that can be found in southwestern parts of the United States and parts of South America. This species can be identified by its chaetotaxy, metallic blue color, club-shaped palp, and brown calypters.

<i>Fannia scalaris</i> Species of fly

Fannia scalaris, also known as the latrine fly, is a fly species in the Fanniidae family. This species is smaller and more slender than the house fly, Musca domestica, and is similar in appearance to the lesser house fly, Fannia canicularis. The life cycle of this species can be as long as one month. These flies are globally distributed in urban areas as they are drawn to unsanitary environments. F. scalaris is a major cause of myiasis, the infestation of a body cavity by fly maggots. The adults infest bodies that have decomposed, making the species an important part of forensic entomology. The larvae of this fly have adapted protuberances, or feathered appendages, that allow them to survive in such a moist environment. Entomologists continue to research the effects that F. scalaris may have medically, forensically, and on the environment around them.

<i>Calliphora livida</i> Species of fly

Calliphora livida is a member of the family Calliphoridae, the blow flies. This large family includes the genus Calliphora, the "blue bottle flies". This genus is important in the field of forensic entomology because of its value in post-mortem interval estimation.

<i>Lucilia coeruleiviridis</i> Species of fly

Lucilia coeruleiviridis, formerly Phaenecia coeruleiviridis, is commonly known as a green bottle fly, because of its metallic blue-green thorax and abdomen. L. coeruleiviridis was first discovered by French entomologist Pierre-Justin-Marie Macquart in 1855. It belongs to the family Calliphoridae and is one of many forensically important Diptera, as it is often found on decaying substances. L. coeruleiviridis is one of the most ubiquitous blow fly species in the southeastern United States, particularly in the spring and fall months.

<i>Protophormia terraenovae</i> Species of fly

Protophormia terraenovae is commonly called northern blowfly, blue-bottle fly or blue-assed fly. It is distinguished by its deep blue coloration and large size and is an important species throughout the Northern Hemisphere. This fly is notable for its economic effect as a myiasis pest of livestock and its antibiotic benefits in maggot therapy. Also of interest is P. terraenovae’s importance in forensic investigations: because of their temperature-dependent development and their prominent presence on corpses, the larvae of this species are useful in minimum post-mortem interval (mPMI) determination.

Calliphora loewi is part of the family Calliphoridae, bottle flies and blowflies, and in the genus Calliphora, blue bottle flies. The genus can be deceiving since C. loewi is not blue. Though this species is rare, it can play an important part in forensic entomology, spreading disease, and decomposing carrion. The life cycle of C. loewi is similar to the life cycle of the genus Calliphora. Since this species is rare there has not been very much research done with this species.

References

  1. Beard, J.R., & C., Cassell's Latin Dictionary, 1977, Cassell's, Pg. 501
  2. 1 2 3 Hall, G., David, The Blowflies of North America, 1948, Thomas Say Foundation, Pgs. 327-331
  3. Castner, L., James, Photographic Atlas of Entomology and Guide to Insect Identification, 2001, Feline Pr, Pg. 148
  4. 1 2 3 Byrd, H., Jason, and James L. Castner, Forensic Entomology: The Utility of Arthropods in Legal Investigations, 2000, CRC, pg. 48
  5. Whitworth, Terry. 2006. Keys to the Genera and Species of the Blow Flies (Diptera:Calliphoridae) of America North of Mexico. PROC. ENTOL. SOC. WASH. 30 June. 108(3), Pp.699-708
  6. Gill, J., Ginger, 2005, "Decomposition and Arthropod Succession on Above Ground Pig Carrion in Rural Manitoba" Archived 2011-07-06 at the Wayback Machine , Canadian Police Research Centre
  7. 1 2 3 Smith, G.V., Kenneth, A Manual of Forensic Entomology, 1987, Cornell Univ Pr, Pgs. 16 & 46
  8. Southwestern Entomologist, 2003, Volume 1, Issue 1, Pg. 41
  9. Stevens, R., Jamie, "The Evolution of Myiasis in Blowflies (Calliphoridae)", International Journal for Parasitology, Volume 33, Issue 10, Pgs. 1105-1113
  10. Wells, JD., "Human and Insect Mitochondrial DNA Analysis From Maggots", Journal of Forensic Sciences, Volume 46, Issue 3
  11. Olsen, R., Alan, 1998, Regulatory Action Criteria for Filth and Other Extraneous Materials [ dead link ], Regulatory Toxicology and Pharmacology, Volume 28, Issue 3, Pgs. 199-211