Diplura: Difference between revisions
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==Anatomy== |
==Anatomy== |
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[[File:Diplura Campodea Japyx.jpg|thumb|left|Anatomy of ''Campodea'' (Campodeidae) and ''Japyx'' (Japygidae)]] |
[[File:Diplura Campodea Japyx.jpg|thumb|left|Anatomy of ''Campodea'' (Campodeidae) and ''Japyx'' (Japygidae)]] |
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Diplurans are mostly {{convert|2|-|5|mm|2}} long, although some species of ''[[Japyx]]'' may reach {{convert|50|mm|abbr=on}}.<ref name="Kendall"/> They have no [[eye]]s and, apart from the darkened cerci in some species, they are unpigmented.<ref name="Kendall"/> They have long [[antenna (biology)|antennae]] with 10 or more [[bead]]-like segments projecting forward from the head,<ref name="McMaster">{{cite web |
Diplurans are mostly {{convert|2|-|5|mm|2}} long, although some species of ''[[Japyx]]'' may reach {{convert|50|mm|abbr=on}}.<ref name="Kendall"/> They have no [[eye]]s and, apart from the darkened cerci in some species, they are unpigmented.<ref name="Kendall"/> They have long [[antenna (biology)|antennae]] with 10 or more [[bead]]-like segments projecting forward from the head,<ref name="McMaster">{{cite web|url=http://www.science.mcmaster.ca/Biology/insect/diplura.htm |title=Diplura |publisher=[[McMaster University]] |year=1999 |deadurl=yes |archiveurl=https://web.archive.org/web/20070327085016/http://www.science.mcmaster.ca:80/Biology/insect/diplura.htm |archivedate=2007-03-27 |df= }}</ref> and a pair of [[Cercus|cerci]] projecting backwards from the last of the 11 abdominal [[somite]]s.<ref name="Earthlife">{{cite web|url=http://www.earthlife.net/insects/diplura.html |title=Diplura |date=November 11, 2005 |publisher=The Earthlife Web |deadurl=yes |archiveurl=https://web.archive.org/web/20061205033402/http://earthlife.net:80/insects/diplura.html |archivedate=2006-12-05 |df= }}</ref> These cerci may be long and filamentous or short and pincer-like,<ref name="Iziko">{{cite web|url=http://www.museums.org.za/bio/insects/diplura/ |title=Diplura |year=2004 |publisher=[[Iziko Museums of Cape Town]] |deadurl=yes |archiveurl=https://web.archive.org/web/20070926231819/http://www.museums.org.za/bio/insects/diplura/ |archivedate=2007-09-26 |df= }}</ref> leading to occasional confusion with [[earwig]]s.<ref name="CSIRO"/> These cerci give the group its name, from the [[Greek language|Greek]] ''diplo'' ("two") and ''uros'' ("tail").<ref name="McMaster"/> Some diplurans have the ability to shed their cerci if necessary ([[autotomy]]); of all terrestrial arthropods, only diplurans have the ability to regenerate these lost appendages over a series of [[ecdysis|moults]].<ref name="McMaster"/> Moulting occurs up to 30 times throughout the life of a dipluran, which is estimated to last up to one year.<ref name="CSIRO"/> The abdomens of diplurans bear eversible vesicles,<ref name="NCSU">{{cite web |url=http://www.cals.ncsu.edu/course/ent425/compendium/diplura.html |title=Diplura |author=John R. Meyer |publisher=[[North Carolina State University]] |year=2005}}</ref> which seem to absorb moisture from the environment and help with the animal's [[water balance]].<ref name="McMaster"/> |
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==Ecology== |
==Ecology== |
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Revision as of 15:16, 13 December 2016
| Diplurans Temporal range: [1]
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| Campodea staphylinus, Belgium | |
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| Order: | Diplura Börner, 1904
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| Families [2] | |
The order Diplura is one of the four groups of hexapods, alongside insects, springtails and Protura. They are sometimes called "two-pronged bristletails".[3] Around 800 species have been described, of which around 70 occur in North America,[2] 12 in Great Britain[4] and two in Australia.[5]
Anatomy
Diplurans are mostly 2–5 millimetres (0.08–0.20 in) long, although some species of Japyx may reach 50 mm (2.0 in).[4] They have no eyes and, apart from the darkened cerci in some species, they are unpigmented.[4] They have long antennae with 10 or more bead-like segments projecting forward from the head,[6] and a pair of cerci projecting backwards from the last of the 11 abdominal somites.[7] These cerci may be long and filamentous or short and pincer-like,[8] leading to occasional confusion with earwigs.[5] These cerci give the group its name, from the Greek diplo ("two") and uros ("tail").[6] Some diplurans have the ability to shed their cerci if necessary (autotomy); of all terrestrial arthropods, only diplurans have the ability to regenerate these lost appendages over a series of moults.[6] Moulting occurs up to 30 times throughout the life of a dipluran, which is estimated to last up to one year.[5] The abdomens of diplurans bear eversible vesicles,[9] which seem to absorb moisture from the environment and help with the animal's water balance.[6]
Ecology
Diplurans are common in moist soil, leaf litter or humus,[9] but are rarely seen because of their size and subterranean lifestyles.[6] They have biting mouthparts and feed on a variety of live prey and dead organic matter.[3] Members of the family Japygidae are mainly predatory and use their pincer-like cerci to capture prey, including springtails, isopods, small myriapods, insect larvae, and even other diplurans, while members of the family Campodeidae feed on soil fungi, mites, springtails, and other small soil invertebrates, as well as detritus.[3] Those species with long cerci are herbivorous.[5]
Like other non-insect hexapods, diplurans have external fertilisation. Males lay up to 200 spermatophores a week, which are held off the ground by a short stalk and probably only remain viable for about two days.[9] The female collects the spermatophore with her genital opening, and later lays eggs in a cavity in the ground.[5][6][9] The hatchlings do not undergo metamorphosis, but resemble the adults, apart from their smaller size, lesser number of setae and their lack of reproductive organs.[3]
Relatives
The relationships among the four groups of hexapods are not resolved, but most recent studies argue against a monophyletic Entognatha.[10] The fossil record of the Diplura is sparse, but one apparent dipluran dates from the Carboniferous.[2] This early dipluran, Testajapyx, had compound eyes, and mouthparts that more closely resembled those of true insects than those of modern diplurans do.
References
- ^ Hoell, H.V., Doyen, J.T. & Purcell, A.H. (1998). Introduction to Insect Biology and Diversity, 2nd ed. Oxford University Press. p. 320. ISBN 0-19-510033-6.
{{cite book}}: CS1 maint: multiple names: authors list (link) - ^ a b c David R. Maddison (January 1, 2005). "Diplura". Tree of Life Project.
- ^ a b c d "Guide to New Zealand Soil Invertebrates". Massey University. 2006.
- ^ a b c David Kendall (2005). "Diplura". Kendall Bioresearch Services.
- ^ a b c d e "Diplura". CSIRO Entomology.
- ^ a b c d e f "Diplura". McMaster University. 1999. Archived from the original on 2007-03-27.
{{cite web}}: Unknown parameter|deadurl=ignored (|url-status=suggested) (help) - ^ "Diplura". The Earthlife Web. November 11, 2005. Archived from the original on 2006-12-05.
{{cite web}}: Unknown parameter|deadurl=ignored (|url-status=suggested) (help) - ^ "Diplura". Iziko Museums of Cape Town. 2004. Archived from the original on 2007-09-26.
{{cite web}}: Unknown parameter|deadurl=ignored (|url-status=suggested) (help) - ^ a b c d John R. Meyer (2005). "Diplura". North Carolina State University.
- ^ A. Carapelli; F. Nardi; R. Dallai; F. Frati (2006). "A review of molecular data for the phylogeny of basal hexapods". Pedobiologia. 50 (2): 191–204. doi:10.1016/j.pedobi.2006.01.001.
External links
Data related to Diplura at Wikispecies- dipluran (insect) at the Encyclopædia Britannica
