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Drosophila
Drosophila sp.
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Diptera
Suborder: Brachycera
Family: Drosophilidae
Subfamily: Drosophilinae
Genus: Drosophila
Fallén, 1823
Type species
Musca funebris
Fabricius, 1787
Synonyms

Chaetodrosophilella Duda, 1923
Spinulophila Duda, 1923
Acrodrosophila Duda, 1924
Spinodrosophila Duda, 1924
Sordophila Wheeler, 1949

Drosophila is a genus of small flies, belonging to the family Drosophilidae, whose members are often called "fruit flies" or more appropriately (though less frequently) pomace flies, vinegar flies, or wine flies, a reference to the characteristic of many species to linger around overripe or rotting fruit. They should not be confused with the Tephritidae, a related family, which are also called fruit flies (sometimes referred to as "true fruit flies"); tephritids feed primarily on unripe or ripe fruit, with many species being regarded as destructive agricultural pests, especially the Mediterranean fruit fly. One species of Drosophila in particular, D. melanogaster, has been heavily used in research in genetics and is a common model organism in developmental biology. Indeed, the terms "fruit fly" and "Drosophila" are often used synonymously with D. melanogaster in modern biological literature. The entire genus, however, contains more than 1,500 species[1] and is very diverse in appearance, behavior, and breeding habitat.

Contents

Name

The term "Drosophila", meaning "dew-loving", is a modern scientific Latin adaptation from Greek words δρόσος, drósos, "dew", and φίλος, phílos, "loving" with the Latin feminine suffix -a. On occasion, the name is misspelled as "drosophilia".

Morphology

Side view of head showing characteristic bristles above the eye.
D. setosimentum, a species of Hawaiian picture-wing fly.

Drosophila are small flies, typically pale yellow to reddish brown to black, with red eyes. Many species, including the noted Hawaiian picture-wings, have distinct black patterns on the wings. The plumose (feathery) arista, bristling of the head and thorax, and wing venation are characters used to diagnose the family. Most are small, about 2-4 millimetres long, but some, especially many of the Hawaiian species, are larger than a house fly.

Life cycle and ecology

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Habitat

Drosophila are found all around the world, with more species in the tropical regions. They can be found in deserts, tropical rainforest, cities, swamps, and alpine zones. Some northern species hibernate. Most species breed in various kinds of decaying plant and fungal material, including fruit, bark, slime fluxes, flowers, and mushrooms. The larvae of at least one species, D. suzukii, can also feed in fresh fruit and can sometimes be a pest.[2] A few species have switched to being parasites or predators. Many species can be attracted to baits of fermented bananas or mushrooms, but others are not attracted to any kind of baits. Males may congregate at patches of suitable breeding substrate to compete for the females, or form leks, conducting courtship in an area separate from breeding sites.

Several Drosophila species, including D. melanogaster, D. immigrans, and D. simulans, are closely associated with humans, and are often referred to as domestic species. These and other species (D. subobscura, Zaprionus indianus[3][4][5][6]) have been accidentally introduced around the world by human activities such as fruit transports.

Reproduction

Drosophila melanogaster egg
Drosophila eggs inserted deep in bark, showing the long respiratory filaments.
Drosophila larva
Drosophila pupae – the white ones are young pupae while the brown ones are older.

Males of this genus are known to have the longest sperm cells of any organism on Earth, including one species, Drosophila bifurca, that have sperm that are 5.8 centimetres long.[7] The cells are mostly tail, and are delivered to the females in tangled coils. The other members of the genus Drosophila also make relatively few giant sperm cells, with D. bifurca's being the longest.[8] D. melanogaster sperm cells are a more modest 1.8 millimetres long, although this is still about 300 times as long as a human sperm.

Drosophila vary widely in their reproductive capacity. Those such as D. melanogaster that breed in large, relatively rare resources have ovaries that mature 10–20 eggs at a time, so that they can be laid together on one site. Others that breed in more-abundant but less nutritious substrates, such as leaves, may only lay one egg per day. The eggs have one or more respiratory filaments near the anterior end; the tips of these extend above the surface and allow oxygen to reach the embryo. Larvae feed not on the vegetable matter itself but on the yeasts and microorganisms present on the decaying breeding substrate. Development time varies widely between species (between 7 and more than 60 days) and depends on the environmental factors such as temperature, breeding substrate, and crowding.

Laboratory–cultured animals

Drosophila melanogaster types. Eye colors (clockwise): brown, cinnabar, sepia, vermilion, white, wild. Also, the wild-eyed fly has a yellow body, the sepia-eyed fly has an ebony body, and the brown-eyed fly has a black body.

Drosophila melanogaster is a popular experimental animal because it is easily cultured in mass out of the wild, has a short generation time, and mutant animals are readily obtainable. In 1906 Thomas Hunt Morgan began his work on D. melanogaster and reported his first finding of a white (eyed) mutant in 1910 to the academic community. He was in search of a model organism to study genetic heredity and required a species that could randomly acquire genetic mutation that would visibly manifest as morphological changes in the adult animal. His work on Drosophila earned him the 1933 Nobel Prize in Medicine for identifying chromosomes as the vector of inheritance for genes.

However, some species of Drosophila are difficult to culture in the laboratory, often because they breed on a single specific host in the wild. For some it can be done with particular recipes for rearing media, or by introducing chemicals such as sterols that are found in the natural host; for others it is (so far) impossible. In some cases, the larvae can develop on normal Drosophila lab medium but the female will not lay eggs; for these it is often simply a matter of putting in a small piece of the natural host to receive the eggs. The Drosophila Stock Center in San Diego maintains cultures of hundreds of species for researchers.

Predators

Drosophila are prey for many generalist predators such as robber flies. In Hawaii, the introduction of yellowjackets from the mainland United States has led to the decline of many of the large species. The larvae are preyed on by other fly larvae, staphylinid beetles, and ants.

Systematics

The genus Drosophila as currently defined is paraphyletic (see below) and contains 1450 described species,[1][9] while the estimated total number of species is estimated at thousands.[10] The majority of the species are members of two subgenera: Drosophila (~1,100 species) and Sophophora (including D. (S.) melanogaster; ~330 species). The Hawaiian species of Drosophila (estimated to be more than 500, with ~380 species described) are sometimes recognized as a separate genus or subgenus, Idiomyia,[1] but this is not widely accepted. About 250 species are part of the genus Scaptomyza, which arose from the Hawaiian Drosophila and later re-colonized continental areas.

Evidence from phylogenetic studies suggests that the following genera arose from within the genus Drosophila[11][12]:

  • Liodrosophila Duda, 1922
  • Mycodrosophila Oldenburg, 1914
  • Samoaia Malloch, 1934
  • Scaptomyza Hardy, 1849
  • Zaprionus Coquillett, 1901
  • Zygothrica Wiedemann, 1830
  • Hirtodrosophila Duda, 1923 (position uncertain)

Several of the subgeneric and generic names are based on anagrams of Drosophila. These include:

  • Dorsilopha
  • Lordiphosa
  • Siphlodora
  • Phloridosa
  • Psilodorha

Drosophila species genome project

Drosophila are extensively used as a model organism in genetics (including population genetics), cell-biology, biochemistry, and especially developmental biology. Therefore, extensive efforts are made to sequence drosphilid genomes. The genomes of the following species have been fully or partially sequenced so far:

The data will be used for many purposes, including evolutionary genome comparisons. D. simulans and D. sechellia are sister species, and provide viable offspring when crossed, while D. melanogaster and D. simulans produce infertile hybrid offspring. The Drosophila genome is often compared with the genomes of more distantly related species such as the honeybee Apis mellifera or the mosquito Anopheles gambiae.

Curated data are available at FlyBase.

See also

References

  1. ^ a b c Bächli, G. 1999-2006. TaxoDros: The database on Taxonomy of Drosophilidae.
  2. ^ Drosophila suzukii Center of Invasive Species Research
  3. ^ Vilela CR (1999) Is Zaprionus indianus Gupta, 1970 (Diptera, Drosophilidae) currently colonizing the Neotropical region? Drosophila Information Service 82:37–39.
  4. ^ van der Linde K, Steck GJ, Hibbard K, Birdsley JS, Alonso LM, Houle D (2006) First records of Zaprionus indianus (Diptera, Drosophilidae), a pest species on commercial fruits, from Panama and the United States of America. Florida Entomologist 89:402–404.
  5. ^ Castrezana S (2007) New records of Zaprionus indianus Gupta, 1970 (Diptera, Drosophilidae) in North America and a key to identify some Zaprionus species deposited in the Drosophila Tucson Stock Center. Drosophila Information Service 90:34-36.
  6. ^ World distribution map for Zaprionus indianus
  7. ^ Pitnick, S., G.S. Spicer, T.A. Markow (1995). How long is a giant sperm? Nature 375:109. PMID 7753164
  8. ^ Joly, D., N. Luck, B. Dejonghe (2007). Adaptation to Long Sperm in Drosophila: Correlated Development of the Sperm Roller and Sperm Packaging. Journal of Experimental Zoology (Molecular and Developmental Evolution) 308B:DOI: 10.1002/jez.b.21167. PMID 17377954
  9. ^ Markow, T. A. and P. M. O'Grady (2006). Drosophila: A guide to species identification and use. London, UK, Elsevier Inc.
  10. ^ Patterson, Colin (1999). Evolution. Cornell University Press. ISBN 0801485940. 
  11. ^ O'Grady, P. and R. DeSalle (2008). Out of Hawaii: the origin and biogeography of the genus Scaptomyza (Diptera: Drosophilidae). Biology Letters 4:195-199. DOI: 10.1098/rsbl.2007.0575
  12. ^ Remsen, J. and P. O'Grady (2002). Phylogeny of Drosophilinae (Diptera: Drosophilidae), with comments on combined analysis and character support. Molecular Phylogenetics and Evolution 24:249-264.
  13. ^ Drosophila (Sophophora) melanogaster genome
  14. ^ Drosophila (Sophophora) simulans genome
  15. ^ Drosophila (Sophophora) sechellia genome
  16. ^ Drosophila (Sophophora) yakuba genome
  17. ^ Drosophila (Sophophora) erecta genome
  18. ^ Drosophila (Sophophora) ananassae genome
  19. ^ Drosophila (Sophophora) pseudoobscura genome
  20. ^ Drosophila (Sophophora) persimilis genome
  21. ^ Drosophila (Sophophora) willistoni genome
  22. ^ Drosophila (Drosophila) mojavensis genome
  23. ^ Drosophila (Drosophila) virilis genome
  24. ^ Drosophila (Drosophila) grimshawi genome

External links


Wiktionary

Up to date as of January 15, 2010

Definition from Wiktionary, a free dictionary

Contents

Translingual

Etymology

Proper noun

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Wikipedia has an article on:

Wikipedia

Drosophila

  1. a taxonomic genus, within family Drosophilidae - the fruit flies
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Wikispecies has information on:

Wikispecies

See also


Wikispecies

Up to date as of January 23, 2010

From Wikispecies

Taxonavigation

Main Page
Cladus: Eukaryota
Supergroup: Unikonta
Cladus: Opisthokonta
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Cladus: Protostomia
Cladus: Ecdysozoa
Phylum: Arthropoda
Subphylum: Hexapoda
Classis: Insecta
Cladus: Dicondylia
Cladus: Pterygota
Cladus: Metapterygota
Cladus: Neoptera
Cladus: Eumetabola
Cladus: Endopterygota
Superordo: Panorpida
Cladus: Antliophora
Ordo: Diptera
Subordo: Brachycera
Infraordo: Muscomorpha
Sectio: Schizophora
Subsectio: Acalyptrata
Superfamilia: Ephydroidea
Familia: Drosophilidae
Genus: Drosophila
Species: D. bifurca - D. bunnanda - D. busckii - D. gaucha - D. gibbinsi - D. hydei - D. immigrans - D. kuntzei - D. mauritiana - D. sechellia - D. serrata - D. sharpi - D. simulans - D. subobscura

ateledrosophila Species Group

Species: D. diamphidia - D. papala - D. preapicula

melanogaster Species Group

Species: D. melanogaster - D. suzukii

nudidrosophila Species Group

hirtitibia Species Subgroup

Species: D. hirtitibia - D. konaensis - D. mawaena - D. papaalai

kahania Species Subgroup

Species: D. kahania - D. longipalpus

nudidrosophila Species Subgroup

Species: D. aenicta - D. amita - D. canavalia - D. eximia - D. gemmula - D. kualapa - D. lepidobregma - D. mahui - D. malele - D. panoanoa - D. poonia

okala Species Subgroup

Species: D. akoko - D. kuhao - D. makawao - D. okala - D. panina

velata Species Subgroup

Species: D. halapepe - D. kauaiensis - D. lauoho - D. milolii - D. pohaka - D. velata

Name

Drosophila Fallén, 1823

References

  • McEvey, S.F. 2009: Taxonomic review of the Australian Drosophila setifemur species group, a new name for the D. dispar species group (Diptera: Drosophilidae). Records of the Australian Museum, 61: 31–38. PDF
  • Magnacca, K.N. & P. M. O'Grady, 2008, Systematic Entomology 33 (2): 395-428 DOI: abs/10.1111/j.1365-3113.2007.00400.x. Abstract:[1]
  • Sidorenko, V.S., 2009: A review of species of the Drosophila quinaria Loew Species-Group (Diptera: Drosophilidae) of the Asian part of Russia and Adjacent Countries. Entomological review 89 (1): 85-90. DOI: 10.1134/S0013873809010126. Full article: [2].

Vernacular names

English: small fruit fly, vinegar fly
日本語: ショウジョウバエ属
Wikimedia Commons For more multimedia, look at Category:Drosophila on Wikimedia Commons.

Simple English

Drosophila
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Diptera
Suborder: Brachycera
Family: Drosophilidae
Subfamily: Drosophilinae
Genus: Drosophila
Fallén, 1823
Type species
Musca funebris
Fabricius, 1787
Synonyms

Chaetodrosophilella Duda, 1923
Spinulophila Duda, 1923
Acrodrosophila Duda, 1924
Spinodrosophila Duda, 1924
Sordophila Wheeler, 1949

Drosophila is a genus of small flies, belonging to the family Drosophilidae, whose members are often called "fruit flies".

There are many species in this genus. Some do prefer places where there is rotting fruit. The adults may feed on nectar, and may lay their eggs on or near decaying fruit. The details differ greatly from species to species. The largest number of species is in the Hawaiian Islands.

One species of Drosophila in particular, D. melanogaster, has been heavily used in research in genetics and is a common model organism in developmental biology. The entire genus contains more than 1,500 species[1] and is very diverse in appearance, behavior, and breeding habitat.

References

  1. Gerhard Bächli|Bächli G. 1999-2006. TaxoDros: The database on Taxonomy of Drosophilidae.


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