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Glossina morsitans

Glossina morsitans
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Diptera
Family: Glossinidae
Genus: Glossina
Species:
G. morsitans
Binomial name
Glossina morsitans
Westwood, 1851

Glossina morsitans is a species of tsetse fly (genus Glossina). It is one of the major vectors of Trypanosoma brucei rhodesiense[1] in African savannas.[2]

Taxonomy

Glossina morsitans is variously classified into the subgenus Glossina s.s.[2] or as the name species of the morsitans species group. Three subspecies are traditionally recognized for G. morsitans:[1][2][3]

  1. G. m. submorsitans
  2. G. m. morsitans
  3. G. m. centralis

G.m.s. is further subdivided by some authors into a G. m. s. ugandensis.[4]

Morphology

Egg

About 1.5–1.6 millimetres (15⁄256–1⁄16 in) long.[5][6]

Pregnant female
Pregnant female

Larvae

First instar

1.8 millimetres (5⁄64 in) long.[5]

Second instar

4.5 millimetres (11⁄64 in) long.[5]

Third instar

6–7 millimetres (15⁄64–9⁄32 in) long.[5]

Adult

Adults are 7.75 millimetres (5⁄16 in). G. morsitans is occasionally distinguishable from congeners by the unaided eye - there are differences in gross coloration - if it can be observed resting. It is more readily distinguishable by microscopic examination.[7]

Metabolism

Flight muscles are primarily powered by proline, which is synthesized from fatty acids mobilised out of the fat body. Proline is so efficiently used in muscle mitochondria because they are specialised towards proline oxidising enzymes, and away from enzymes using fatty acids and pyruvate.[8]

Distribution

G. morsitans is found in East Africa and Equatorial Africa.[1][9]

It is the tsetse species that is presently reported from the highest number of African countries,[10] i.e. at least 22 including: Angola, Burkina Faso,[11] Cameroon, Central African Republic, Chad, Democratic Republic of the Congo, Ethiopia,[12] Gambia, Ghana, Guinea, Malawi, Mali,[13] Mozambique, Nigeria,[14] Rwanda, Senegal, Sudan,[15] Tanzania, Togo, Uganda, Zambia and Zimbabwe.[16]

The species was also historically reported in Benin, Burundi, Guinea-Bissau, Ivory Coast, Kenya, Niger, Sierra Leone and South Sudan, although recent published data for the species in these countries is lacking.[10] G. morsitans  was also present in Botswana[17] and Namibia, but the species is believed to have been sustainably eliminated in these two countries by means of aerial spraying of insecticide.[10][17]

Hosts

G. morsitans feeds upon warthogs, oxen, buffaloes, kudus, and humans.[18] About 6% of G. m. s.'s bloodmeals come from birds (excluding ostriches).[19]

Genome

A sequence was made available in 2014. Among other results this reveals that G. morsitans's genome has incorporated some of its Wolbachia symbiont's genome (see also § Symbionts below).[20] The sense of taste of G. m. m. lacks the sense of sweetness - which may be due to its exclusively hematophagous diet.[21]

Genetics

G. morsitans carries 3 Ago2‍s according to data compiled by Mongelli & Saleh 2016[22][23] and Dowling et al 2016 finds 2 Ago3‍s[23] while Mongelli & Saleh's compilation shows 3.[22][23]

Symbionts

G. m. m. is in obligate symbiosis with Wigglesworthia glossinidia and Wolbachia. Without Wigglesworthia, G. m. m. is sterile, and without Wolbachia they are reproductively incompatible with normal flies.[24]

Economic impact

Trypanosomiasis transmitted by G. morsitans and other tsetse species is one of the largest economic problems Africa faces. It has radically altered the cattle agroeconomy across the middle of Africa, severely shrinking the cattle pastoral lifestyle by shrinking the extent of safe grazing lands. This has left about 10,400,000 square kilometres (4,000,000 sq mi) of otherwise usable land devoid of cattle. Raising cattle in the manner common in 1963, this would have allowed for another 125,000,000 head - more than doubling the 114,000,000 being raised at the time.[25]

References

  1. ^ a b c Pollock, J. N., ed. (1982). Training Manual for Tsetse Control Personnel: Tsetse biology, systematics and distribution; techniques. Rome: FAO.
  2. ^ a b c Rozendaal, Jan A. (1996). "2. Tsetse flies". Vector Control : Methods for Use by Individuals and Communities. Albany: World Health Organization. pp. 178–192. ISBN 92-4-154494-5. OCLC 927460540.
  3. ^ Gooding, R.H.; Krafsur, Elliot Scoville (2005). "Tsetse Genetics: Contributions to Biology, Systematics, and Control of Tsetse Flies". Annual Review of Entomology. 50 (1). Annual Reviews: 101–123. doi:10.1146/annurev.ento.50.071803.130443. ISSN 0066-4170. PMC 1462949. PMID 15355235.
  4. ^ Krafsur, Elliot Scoville (2009). "Tsetse flies: Genetics, evolution, and role as vectors". Infection, Genetics and Evolution. 9 (1). Elsevier: 124–141. Bibcode:2009InfGE...9..124K. doi:10.1016/j.meegid.2008.09.010. ISSN 1567-1348. PMC 2652644. PMID 18992846.
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Further reading

Quelle: https://en.wikipedia.org/wiki/Glossina_morsitans_centralis