Difference between revisions of "AY Honors/Insect/Strepsiptera"

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{{Taxobox
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| name = Strepsiptera
 
| image = Strepsiptera-halictophagida.gif
 
| image_caption = male
 
| image2 = StrepsipteraFem.jpg
 
| regnum = [[Animal]]ia
 
| phylum = [[Arthropod]]a
 
| classis = [[Insect]]a
 
| ordo = '''Strepsiptera'''
 
| ordo_authority = [[William Kirby (entomologist)|Kirby]], 1813
 
| subdivision_ranks = Families
 
| subdivision =
 
[[Mengenillidae]]<br>
 
[[Mengeidae]]<br>
 
[[Stylopidae]]<br>
 
[[Bohartillidae]]<br>
 
[[Corioxenidae]]<br>
 
[[Halictophagidae]]<br>
 
[[Callipharixenidae]]<br>
 
[[Elenchidae]]<br>
 
[[Myrmecolacidae]]
 
}}
 
 
 
The '''Strepsiptera''' (occasionally  known as ''twisted-winged parasites'') are an order of [[insect]]s with nine families making up about 610 species. They are [[parasitoid]]s [[Entomophagous Parasite|on other insects]]; their hosts include [[bee]]s, [[wasp]]s, [[leafhopper]]s, [[silverfish]], and [[cockroach]]es.
 
 
 
Male Strepsiptera have [[insect wing|wings]], [[arthropod leg|legs]], [[eye]]s, and [[antenna (biology)|antennae]], and look like flies, though they generally have no useful [[mouthparts]]. Females, in all families except the [[Mengenillidae]], never leave their host and are [[neoteny|neotenic]] in form, lacking wings and legs. Males have a very short adult lifetime (usually less than five hours) and do not feed as adults. They search for and mate with a female (whose anterior region extrudes through the host's body). Sperm passes through an opening in the head of the female and from there directly into the body cavity ([[haemocoel]]). Each female produces many thousands of [[triungulin]] larvae that escape from its body and out of the host into the soil and vegetation. These actively search out new hosts.<ref name=borror>Borror, D.J., Triplehorn, C.A. Johnson. ( 1989) Introduction to the Study of Insects. 6th ed. Brooks Cole.</ref>
 
{{userboxtop|toptext=&nbsp;|align=left|left=0}}
 
{{clade| style=font-size:75%;line-height:75%
 
|label1=[[Neoptera]]
 
|1={{clade
 
  |1={{clade
 
      |1={{clade
 
        |1=[[Megaloptera]]
 
|2=[[Raphidioptera]]
 
|3=[[Neuroptera]]
 
        }}
 
      |2=[[Coleoptera]]
 
      }}
 
  |label2=?
 
  |2={{clade
 
      |label1=Strepsiptera
 
      |1={{clade
 
        |1=Stylopidia
 
|2=?Mengenillidae
 
        }}
 
      }}
 
  |3={{clade
 
      |1={{clade
 
        |1={{clade
 
    |1=[[Diptera]]
 
    |2=[[Mecoptera]]
 
    |3=[[Siphonaptera]]
 
    }}
 
  |2={{clade
 
    |1=[[Trichoptera]]
 
    |2=[[Lepidoptera]]
 
    }}
 
}}
 
      |2=[[Hymenoptera]]
 
      }}
 
  }}
 
}}
 
Suggested phylogenetic position of the Strepsiptera.<ref>Kathirithamby, Jeyaraney. 2002. Strepsiptera. Twisted-wing parasites. Version 24 September 2002. [http://tolweb.org/Strepsiptera/8222/]  in [http://tolweb.org/ The Tree of Life Web Project]</ref>
 
{{userboxbottom}}
 
Strepsiptera find and enter their insect hosts as [[planidium|planidium larvae]]. They undergo [[hypermetamorphosis]] and become a less mobile legless larval form. In this stage they feed within the host's body cavity. The colour and shape of the host's abdomen may be changed and the host usually becomes sterile. The parasites then undergoes [[holometabolous metamorphosis]] to become adults. Adult males emerge out of the host body while females stay on inside.
 
 
 
Male Strepsiptera have eyes unlike those of any other [[insect]], resembling the schizochroal eyes found in the [[trilobite]] group known as [[Phacopida]]. Instead of [[compound eye]]s consisting of hundreds of [[ommatidia]], each of which sees one pixel, the strepsipteran eyes consist of a few dozen lenses, each with its own individual [[retina]].
 
 
 
The order, named by [[William Kirby (entomologist)|William Kirby]] in 1813, is named for the [[Hindwing|hind wings]] (strepsi=twisted + ptera=wing), which are held at a twisted angle when at rest. The forewings are reduced to [[halteres]].
 
 
 
Strepsiptera are an enigma to taxonomists. Originally it was believed they were the sister group to the beetle families [[Meloidae]] and [[Ripiphoridae]], which have similar parasitic development and forewing reduction; more recent theories say they are the sister group to the [[beetle]]s; even more recently, molecular genetic analyses have suggested that they are the sister group to the [[flies]], which have hindwings modified into halteres.  The earliest strepsipteran is the highly primitive ''[[Cretostylops engeli]]'' discovered in middle Cretaceous amber from [[Myanmar]]. 
 
==Families==
 
Males of the family Mengeidae have 5-segmented tarsi with claws, the antennae are 6-7 segmented, the third and fourth segments have long lateral processes. Stylopidae have 4 segmented tarsi and 4-6 segmented antennae with the third segment having a lateral process. The Elenchidae have 2-segmented tarsi and 4 segmented antennae with the third segment having a lateral process. The Halictophagidae have 3-segmented tarsi and 7-segmented antennae with lateral processes from the the third and fourth segments.<ref name=borror/>
 
The Stylopidae mostly parasitize wasps and bees, the Elenchidae are known to parasitize Fulguroidea while the Halictophagidae are found on leafhoppers, treehoppers as well as mole cricket hosts.<ref name=borror/>
 
==Notes==
 
{{reflist}}
 
== References ==
 
*{{cite book|author=[[David Grimaldi|Grimaldi, D.]] and [[Michael S. Engel|Engel, M.S.]] |title=Evolution of the Insects|year=[[2005]]|publisher=[[Cambridge University Press]]|id=ISBN 0-521-82149-5}}
 
 
 
==External links==
 
* http://tolweb.org/tree?group=Strepsiptera
 
* [http://www.gbhap.com/journals/pdf/ghbi_12_01_06.pdf Survey of Modern Counterparts of Schizochroal Trilobite Eyes: Structural and Functional Similarities and Differences]
 
 
 
[[Category:Insects]]
 
[[Category:Strepsiptera| ]]
 
[[Category:Biological pest control agents]]
 
 
 
[[de:Fächerflügler]]
 
[[es:Strepsiptera]]
 
[[fa:پیچیده‌بالان]]
 
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[[it:Strepsiptera]]
 
[[hu:Legyezőszárnyúak]]
 
[[nl:Waaiervleugelige]]
 
[[ja:ネジレバネ]]
 
[[no:Viftevinger]]
 
[[pl:Wachlarzoskrzydłe]]
 
[[ru:Веерокрылые]]
 
[[sl:Pahljačekrilci]]
 
[[sv:Vridvingar]]
 

Revision as of 00:12, 25 November 2007

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