Acrotrichis

***Acrotrichis*** er en slekt av fjærvinger som noen av de aller minste billene. Det er beskrevet omtrent 200 arter, men det finnes sannsynligvis mange flere ubeskrevne.

## Utseende
Knøttsmå (0,5 – 1,2&nbsp;mm), forholdsvis brede og litt flate, brunsvarte til svarte fjærvinger. **Hodet** er kort og bredt, rundet. Fasettøynene er ganske små. Antennene er 11-leddete, ganske lange og spinkle. De to innerste og tre ytterste leddene er forstørrede, de mellomliggende ganske små. De tre ytterste leddene er spoleformede, danner ikke noen tydelig klubbe. Hos de fleste artene har oversiden tydelig mikroskulptur og fine hår, og er derfor ganske matt, noen ganger med antydning til metallisk skinn. **Brystskjoldet** er vanligvis forholdsvis stort og bredt, oftest litt bredere enn dekkvingene, bakhjørnene er trukket tilbake som spisse tagger. **Dekkvingene** er forholdsvis korte, og dekker ikke bakkroppsspissen. Punktrekker finnes ikke. Bakkroppen er foholdsvis flat. En viktig bestemmingskarakter er formen på hunnens sædbeholder (spermathek), der sæd blir lagret etter paringen. Denne er et innviklet organ med buktende ganger og kamre av ulik form, men det kan ofte være vanskelig å dissekere den ut fra bakkroppen for bestemming. **Beina** er korte og spinkle, føttene (tarsene) to- eller tre-leddete.
**Larvene** er hvite eller gulaktige, mer eller mindre sylindriske.

## Levevis
Fjærvinger finnes ofte i tilknytning til ulike slags råtnende materiale, som løvstrø, kompost og møkk. Slekten *Acrotrichis* er ofte svært tallrik på skogbunnen mellom løvstrø og mose.

## Systematisk inndeling/ norske arter

* Ordenen biller, **Coleoptera**
** Underordenen Polyphaga
*** Overfamilien åtsel- og rovbiller, **Staphylinoidea**
**** Familien **[[fjærvinger]], [[Ptiliidae]]** Heer, 1843
***** Underfamilien spissfjærvinger, **[[Acrotrichinae]]**
****** Stammen Acrotrichini
******* Slekten ***Acrotrichis*** Motschulsky, 1848 – den mest artsrike slekten, med mer enn 150 beskrevne arter, av disse er 25 funnet i Norge:
******** *[[Acrotrichis atomaria]]* (De Geer 1774)
******** *[[Acrotrichis brevipennis]]* (Erichson 1845)
******** *[[Acrotrichis chevrolatii]]* (Allibert, 1844)
******** *[[Acrotrichis cognata]]* (A. Matthews 1877)
******** *[[Acrotrichis dispar]]* (A. Matthews, 1864)
******** *[[Acrotrichis fascicularis]]* (Herbst, 1793)
******** *[[Acrotrichis grandicollis]]* (Mannerheim 1844)
******** *[[Acrotrichis henrici]]* (A. Matthews 1872)
******** *[[Acrotrichis insularis]]* (Mäklin 1852)
******** *[[Acrotrichis intermedia]]* (Gillmeister 1845)
******** *[[Acrotrichis lucidula]]* Rosskothen 1935
******** *[[Acrotrichis montandonii]]* (Allibert 1844)
******** *[[Acrotrichis norvegica]]* A. Strand 1941
******** *[[Acrotrichis parva]]* Rosskothen 1935
******** *[[Acrotrichis pumila]]* (Erichson 1845)
******** *[[Acrotrichis rosskotheni]]* Sundt 1971
******** *[[Acrotrichis rugulosa]]* Rosskothen 1935
******** *[[Acrotrichis sericans]]* (Heer 1841)
******** *[[Acrotrichis silvatica]]* Rosskothen 1935
******** *[[Acrotrichis sitkaensis]]* (Motschulsky 1845)
******** *[[Acrotrichis sjobergi]]* Sundt 1958
******** *[[Acrotrichis strandi]]* Sundt 1958
******** *[[Acrotrichis suecica]]* Sundt 1958
******** *[[Acrotrichis thoracica]]* (Waltl 1838)
******** *[[Acrotrichis volans]]* (Motschulsky 1845)
### Liste over arter som ikke er funnet i Norge

* *[[Acrotrichis abrupta]]* (Haldeman, 1848)
* *[[Acrotrichis absona]]* Darby, 2014
* *[[Acrotrichis africana]]* Johnson, 1969[7]
* *[[Acrotrichis africanoides]]*
* *[[Acrotrichis agricola]]* Darby, 2019
* *[[Acrotrichis alliberti]]* (A. Matthews, 1872)
* *[[Acrotrichis alluaudi]]*
* *[[Acrotrichis angustipennis]]* (A. Matthews, 1884)
* *[[Acrotrichis arambourgi]]* Johnson, 1969
* *[[Acrotrichis armillata]]* Darby, 2015
* *[[Acrotrichis arnoldi]]* Rosskothen, 1935
* *[[Acrotrichis aspera]]* (Haldeman 1848)
* *[[Acrotrichis barclayi]]* Darby, 2014
* *[[Acrotrichis basilewskyi]]* Johnson, 1969
* *[[Acrotrichis bibula]]* Darby, 2014
* *[[Acrotrichis bidentata]]* Johnson, 1985[8]
* *[[Acrotrichis bidilatata]]* (A. Matthews 1884)
* *[[Acrotrichis blandula]]* Johnson, 1985
* *[[Acrotrichis boothi]]* Darby, 2014
* *[[Acrotrichis brasiliensis]]* (A. Matthews 1889)
* *[[Acrotrichis brevior]]* (A. Matthews 1884)
* *[[Acrotrichis brincki]]* Johnson, 1969
* *[[Acrotrichis britteni]]* Johnson, 1969
* *[[Acrotrichis brunneipennis]]* (Motschulsky 1869)
* *[[Acrotrichis brunnescens]]* Johnson, 1969
* *[[Acrotrichis bubalis]]* Darby 2019
* *[[Acrotrichis californica]]* (A. Matthews 1877)
* *[[Acrotrichis capensis]]* Johnson, 1969
* *[[Acrotrichis castanea]]* (A. Matthews 1877)
* *[[Acrotrichis celisi]]* Johnson, 1969
* *[[Acrotrichis cephalotes]]* (Allibert 1844)
* *[[Acrotrichis cervina]]* (Deane 1931)
* *[[Acrotrichis chabooae]]* Darby 2017
* *[[Acrotrichis chilensis]]* (Fairmaire & Germain 1859)
* *[[Acrotrichis cincinna]]* Darby 2015
* *[[Acrotrichis clareae]]* Darby, 2014
* *[[Acrotrichis coiffaiti]]* Johnson, 1984[9]
* *[[Acrotrichis colini]]* Darby, 2014
* *[[Acrotrichis confusa]]* Johnson, 1985
* *[[Acrotrichis convexides]]* Newton, 2017
* *[[Acrotrichis cornuta]]* Darby, 2015
* *[[Acrotrichis corpulenta]]* Darby, 2015
* *[[Acrotrichis crassicollis]]* (A. Matthews, 1866)
* *[[Acrotrichis cursitans]]* (Nietner, 1856)
* *[[Acrotrichis cuspida]]* Darby, 2014
* *[[Acrotrichis danica]]* Sundt, 1958
* *[[Acrotrichis darwinii]]* (A. Matthews, 1889)
* *[[Acrotrichis depressifrons]]* Johnson, 1984
* *[[Acrotrichis difficilis]]* Darby, 2014
* *[[Acrotrichis diffinis]]* (A. Matthews, 1872)
* *[[Acrotrichis discolor]]* (Haldeman, 1848)
* *[[Acrotrichis discoloroides]]* Johnson, 1969
* *[[Acrotrichis dissona]]* Johnson, 1985
* *[[Acrotrichis dohrnii]]* (A. Matthews, 1872)
* *[[Acrotrichis dubitata]]* (A. Matthews, 1894)
* *[[Acrotrichis errata]]* Sundt, 1969
* *[[Acrotrichis ethiopica]]* Johnson, 1969
* *[[Acrotrichis excelsa]]* (A. Matthews, 1884)
* *[[Acrotrichis exigua]]* Darby, 2014
* *[[Acrotrichis extraordinaria]]* Darby, 2017
* *[[Acrotrichis fastigata]]* Darby, 2017
* *[[Acrotrichis femoralis]]* (Rey, 1889)
* *[[Acrotrichis fenestrata]]* (Gillmeister, 1845)
* *[[Acrotrichis flachi]]* (Reitter, 1891)
* *[[Acrotrichis flavipennis]]* (Deane, 1931)
* *[[Acrotrichis franae]]* Darby, 2017
* *[[Acrotrichis franzi]]* Johnson, 1969
* *[[Acrotrichis fuliginosa]]* (A. Matthews, 1900)
* *[[Acrotrichis fulvoides]]* Johnson, 2010
* *[[Acrotrichis fumosa]]* Darby, 2017
* *[[Acrotrichis fungi]]* (M. Abdullah & A. Abdullah, 1967)
* *[[Acrotrichis fungina]]* (Casey, 1885)
* *[[Acrotrichis fusca]]* Johnson, 1988
* *[[Acrotrichis glabricollides]]* Newton 2017
* *[[Acrotrichis glauca]]* (A. Matthews 1884)
* *[[Acrotrichis godmani]]* (A. Matthews 1884)
* *[[Acrotrichis grandis]]* (Deane 1932)
* *[[Acrotrichis grenadensis]]* (A. Matthews 1894)
* *[[Acrotrichis grossa]]* (Motschulsky 1869)
* *[[Acrotrichis haldemani]]* Le Conte 1863
* *[[Acrotrichis hammondi]]* Darby, 2014
* *[[Acrotrichis heissi]]* Darby, 2014
* *[[Acrotrichis hornii]]* (A. Matthews 1872)
* *[[Acrotrichis hova]]* Darby, 2014
* *[[Acrotrichis hypsibius]]* Jeannel & Paulian 1945
* *[[Acrotrichis impressa]]* Darby, 2014
* *[[Acrotrichis inconspicua]]* (A. Matthews 1874)
* *[[Acrotrichis infuscata]]* (Motschulsky 1869)
* *[[Acrotrichis inlecebrosa]]* Darby 2015
* *[[Acrotrichis jeanneli]]* Johnson, 1969
* *[[Acrotrichis jelineki]]* Johnson, 1981
* *[[Acrotrichis jocosa]]* (Deane 1931)
* *[[Acrotrichis josephi]]* (A. Matthews 1872)
* *[[Acrotrichis kemae]]* Polilov, 2008 
* *[[Acrotrichis kubotai]]* Sundt 1969
* *[[Acrotrichis lacrimosa]]* Darby 2015
* *[[Acrotrichis laevicollis]]* (A. Matthews 1894)
* *[[Acrotrichis laticollis]]* (Mäklin 1852)
* *[[Acrotrichis latipedes]]* Sawada & Hirowatari 2002
* *[[Acrotrichis latipennis]]* Nakane 1974
* *[[Acrotrichis lauta]]* Darby, 2014
* *[[Acrotrichis leleupi]]* Johnson, 1969
* *[[Acrotrichis lewisii]]* (A. Matthews 1884)
* *[[Acrotrichis linea]]* Darby 2015
* *[[Acrotrichis lividipennis]]* (Motschulsky 1869)
* *[[Acrotrichis lobeliae]]* Johnson, 1984
* *[[Acrotrichis logunovi]]* Darby, 2014
* *[[Acrotrichis longipennis]]* (Casey 1885)
* *[[Acrotrichis lucida]]* (A. Matthews 1884)
* *[[Acrotrichis madagascariensis]]* (C. Schaufuss 1890)
* *[[Acrotrichis magnifica]]* Darby, 2014
* *[[Acrotrichis malitiosa]]* Darby, 2014
* *[[Acrotrichis matthewsiana]]* Csiki 1911
* *[[Acrotrichis matthewsii]]* Wollaston 1864
* *[[Acrotrichis meridiana]]* Sawada & Hirowatari 2002
* *[[Acrotrichis mimica]]* Johnson, 1969
* *[[Acrotrichis minor]]* (A. Matthews 1884)
* *[[Acrotrichis minuscula]]* Johnson, 1969
* *[[Acrotrichis minutides]]* Newton 2017
* *[[Acrotrichis montivaga]]* (C. Schaufuss 1891)
* *[[Acrotrichis nana]]* A. Strand 1946
* *[[Acrotrichis nanula]]* (Motschulsky 1869)
* *[[Acrotrichis nashi]]* Darby 2015
* *[[Acrotrichis nigella]]* Johnson, 1988
* *[[Acrotrichis nigrita]]* (A. Matthews 1884)
* *[[Acrotrichis norfolkensis]]* (Deane 1931)
* *[[Acrotrichis obesa]]* Darby 2017
* *[[Acrotrichis obscura]]* Darby, 2014
* *[[Acrotrichis occidentalis]]* (A. Matthews 1894)
* *[[Acrotrichis ochracea]]* Britten 1926
* *[[Acrotrichis opacina]]* (Rey 1889)
* *[[Acrotrichis orientalis]]* (Motschulsky 1858)
* *[[Acrotrichis palmi]]* Johnson, 1984
* *[[Acrotrichis parallela]]* (Motschulsky 1869)
* *[[Acrotrichis parallelopipeda]]* (A. Matthews 1877)
* *[[Acrotrichis perexigua]]* Darby, 2014
* *[[Acrotrichis perfida]]* Darby, 2014
* *[[Acrotrichis planulata]]* (Motschulsky 1869)
* *[[Acrotrichis ponderosa]]* Johnson, 1969
* *[[Acrotrichis problematica]]* Johnson, 1969
* *[[Acrotrichis propinqua]]* Johnson, 1984
* *[[Acrotrichis pseudoarmillata]]* Darby 2017
* *[[Acrotrichis pubescens]]* (Rey 1889)
* *[[Acrotrichis pulchellipennis]]* Sawada & Hirowatari 2002
* *[[Acrotrichis pusillima]]* (Motschulsky 1869)
* *[[Acrotrichis quadrangula]]* Motschulsky 1868
* *[[Acrotrichis quadrilatica]]* (Deane 1932)
* *[[Acrotrichis radicola]]* (Casey 1885)
* *[[Acrotrichis reichii]]* (A. Matthews 1872)
* *[[Acrotrichis reticulata]]* (A. Matthews 1889)
* *[[Acrotrichis rotundata]]* (Haldeman 1848)
* *[[Acrotrichis rudebecki]]* Johnson, 1969
* *[[Acrotrichis rufescens]]* (A. Matthews 1884)
* *[[Acrotrichis rufilabris]]* (C. Flach 1888)
* *[[Acrotrichis ryukyuensis]]* Sawada & Hirowatari 2002
* *[[Acrotrichis sallaei]]* (A. Matthews 1872)
* *[[Acrotrichis sanctaehelenae]]* Johnson, 1972
* *[[Acrotrichis schaumii]]* (A. Matthews 1866)
* *[[Acrotrichis scortea]]* Johnson, 1969
* *[[Acrotrichis scotti]]* Johnson, 1969
* *[[Acrotrichis segmenta]]* Darby 2015
* *[[Acrotrichis semirufa]]* Johnson, 1969
* *[[Acrotrichis setigera]]* Johnson, 1984
* *[[Acrotrichis setosa]]* Johnson, 1988
* *[[Acrotrichis silvestris]]* (Motschulsky 1869)
* *[[Acrotrichis similaris]]* Sundt 1969
* *[[Acrotrichis similior]]* (A. Matthews 1884)
* *[[Acrotrichis solomonica]]* Johnson, 1971
* *[[Acrotrichis soror]]* (C. Flach 1889)
* *[[Acrotrichis strenua]]* Darby, 2014
* *[[Acrotrichis subafricana]]* Darby, 2014
* *[[Acrotrichis subglabra]]* (Motschulsky 1869)
* *[[Acrotrichis subnitens]]* (Rey 1889)
* *[[Acrotrichis subnitida]]* (Motschulsky 1869)
* *[[Acrotrichis sumptuosa]]* Darby 2017
* *[[Acrotrichis sundti]]* Johnson, 1969
* *[[Acrotrichis superba]]* Johnson, 1969
* *[[Acrotrichis superbioides]]* Johnson, 1969
* *[[Acrotrichis tampoketsae]]* Darby, 2014
* *[[Acrotrichis tecta]]* Johnson, 1984
* *[[Acrotrichis terminalis]]* Darby, 2014
* *[[Acrotrichis tersa]]* Johnson, 1969
* *[[Acrotrichis tesserula]]* (A. Matthews 1889)
* *[[Acrotrichis truncata]]* Darby, 2014
* *[[Acrotrichis truncatissima]]* (A. Matthews 1889)
* *[[Acrotrichis tuberosa]]* Darby, 2014
* *[[Acrotrichis umbricola]]* (Wollaston 1854)
* *[[Acrotrichis velutina]]* (Motschulsky 1869)
* *[[Acrotrichis vicina]]* (A. Matthews 1877)
* *[[Acrotrichis vitrea]]* (A. Matthews 1884)
* *[[Acrotrichis walkomi]]* (Deane 1931)
* *[[Acrotrichis wenckeri]]* (A. Matthews 1872)
* *[[Acrotrichis williamsi]]* Johnson, 2007
* *[[Acrotrichis wollastoni]]* (A. Matthews 1865)
* *[[Acrotrichis xanthocera]]* (A. Matthews 1877)
* *[[Acrotrichis yazakii]]* Sundt 1969
* *[[Acrotrichis zelotypa]]* Johnson 1971
* *[[Acrotrichis zhantievi]]* Polilov, 2008 

## Referanser




## Kilder
Hall, W.E. 1995. Ptiliidae, Featherwing beetles i Tree of life. http://tolweb.org/Ptiliidae
## Eksterne lenker
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