Orectogyrus

Orectogyrus er en slekt av biller i underordenen Adephaga. familien virvlere.  De har todelte fasettøyne, den ene delen er tilpasset å se i vann, den andre til å se i luft. Når farer dukker opp kan de både dykke og gjøre hopp over vannoverflaten.


== Utseende ==
Middelsstore, avlange, blankt svarte virvlere, gjerne med gul ytterkant. De siste bakkroppsleddene stikker ut som en kjegleformet "hale" bak dekkvingene.


== Levevis ==
Virvlene er rovdyr og spiser insekter som faller ned på vannoverflaten. Disse billene opptrer gjerne i grupper som svømmer rundt på vannoverflaten, og kan minne om radiobiler i et tivoli. Dersom de blir truet dykker de og gjemmer seg nær bunnen. Om en virvler blir fanget, skiller den ut et illeluktende stoff. Dette gjør billen usmakelig for rovdyr og virker også som et alarmstoff overfor andre virvlere.


== Utbredelse ==
Slekten er utbredt i Afrika inkludert Madagaskar og Sør-Amerika.


== Systematisk inndeling ==

Ordenen biller, Coleoptera
Underordenen Adephaga
Familien virvlere, Gyrinidae Latreille, 1810
Underfamilien Gyrininae Latreille, 1810
Stammen Orectochilini Régimbart, 1882
Slekten Orectogyrus Régimbart, 1884


=== Liste over artene ===
Orectogyrus albertianus Ochs, 1938
Orectogyrus alluaudi Régimbart, 1889
Orectogyrus angularis Régimbart, 1891
Orectogyrus argenteovittatus Zimmermann, 1920
Orectogyrus assimilis Régimbart, 1884
Orectogyrus aureovittatus Brinck, 1956
Orectogyrus aureus Ochs, 1934
Orectogyrus baguenai Ochs, 1953
Orectogyrus barrosmachadoi Brinck, 1951
Orectogyrus basilewskyi Guignot, 1951
Orectogyrus bedeli Régimbart, 1884
Orectogyrus bicostatus (Boheman, 1848)
Orectogyrus buettikoferi Régimbart, 1887
Orectogyrus burgeoni Ochs, 1928
Orectogyrus camerunensis Ochs, 1924
Orectogyrus capicolus Brinck, 1955
Orectogyrus centralis Ochs, 1938
Orectogyrus coerulescens (Dejean, 1836)
Orectogyrus collarti Ochs, 1937
Orectogyrus conjugens Régimbart, 1892
Orectogyrus constrictus Régimbart, 1907
Orectogyrus convexus Ochs, 1934
Orectogyrus coptogynus Régimbart, 1906
Orectogyrus costatus (Aubé, 1838)
Orectogyrus cuprifer Régimbart, 1884
Orectogyrus curvipes Ochs, 1947
Orectogyrus cyanicollis (Dejean, 1836)
Orectogyrus cyanipterus Guignot, 1947
Orectogyrus dahomeensis Régimbart, 1907
Orectogyrus decorsei Régimbart, 1907
Orectogyrus dedalus Guignot, 1952
Orectogyrus demeryi Régimbart, 1891
Orectogyrus dimidiatus (Laporte de Castelnau, 1835)
Orectogyrus discors Régimbart, 1891
Orectogyrus dorsiger Régimbart, 1884
Orectogyrus dunkeli Ochs, 1934
Orectogyrus elongatus Régimbart, 1886
Orectogyrus endroedyi Ochs, 1967
Orectogyrus erosus Régimbart, 1906
Orectogyrus escherichi Ochs, 1924
Orectogyrus eversor Brinck, 1956
Orectogyrus familiaris Ochs, 1947
Orectogyrus favareli Guignot, 1942
Orectogyrus feminalis Régimbart, 1906
Orectogyrus ferranti Ochs, 1928
Orectogyrus fluviatilis Régimbart, 1907
Orectogyrus formosus Ochs, 1928
Orectogyrus furcatus Ochs, 1934
Orectogyrus fusciventris Régimbart, 1895
Orectogyrus gigas Ochs, 1934
Orectogyrus glaucus Klug in Ehrenberg, 1834
Orectogyrus grandis Régimbart, 1892
Orectogyrus grisescens Fairmaire, 1899
Orectogyrus guignoti Ochs, 1947
Orectogyrus hancocki Ochs, 1934
Orectogyrus hastatus Régimbart, 1892
Orectogyrus hawashensis Omer-Cooper, 1930
Orectogyrus heros Régimbart, 1884
Orectogyrus imitans Ochs, 1928
Orectogyrus interstitialis Ochs, 1938
Orectogyrus jucundus Régimbart, 1892
Orectogyrus kasikiensis Ochs, 1938
Orectogyrus kaszabi Ochs, 1967
Orectogyrus kelleni Régimbart, 1889
Orectogyrus kutteri Ochs, 1967
Orectogyrus lanceolatus Régimbart, 1884
Orectogyrus laticostis Régimbart, 1906
Orectogyrus latiusculus Ochs, 1938
Orectogyrus leroyi Régimbart, 1886
Orectogyrus lionotus Régimbart, 1884
Orectogyrus longilabris Régimbart, 1895
Orectogyrus longitaris Régimbart, 1884
Orectogyrus luayensis Ochs, 1937
Orectogyrus lujai Ochs, 1928
Orectogyrus lunai Brinck, 1958
Orectogyrus luteolus Ochs, 1938
Orectogyrus madagascariensis (Dejean, 1836)
Orectogyrus manensis Guignot, 1938
Orectogyrus masculinus Régimbart, 1902
Orectogyrus mesochlorus Guignot, 1952
Orectogyrus milliaui Ochs, 1937
Orectogyrus mirabilis Régimbart, 1884
Orectogyrus mocquerysi Régimbart, 1892
Orectogyrus monardi Guignot, 1941
Orectogyrus nairobiensis Régimbart, 1907
Orectogyrus nanus Ochs, 1934
Orectogyrus neumanni Ochs, 1934
Orectogyrus noctuabundus Brinck, 1951
Orectogyrus oberthueri Régimbart, 1884
Orectogyrus obscurus Ochs, 1947
Orectogyrus ochsi Guignot, 1938
Orectogyrus orectochilinus Ochs, 1925
Orectogyrus orientalis Régimbart, 1907
Orectogyrus ornaticollis Aubé, 1838
Orectogyrus oscari Apetz, 1854
Orectogyrus oscaris Régimbart, 1884
Orectogyrus overlaeti Ochs, 1934
Orectogyrus pallidiventris Ochs, 1934
Orectogyrus pallidocinctus (Fairmaire, 1880)
Orectogyrus pamelae Brinck, 1960
Orectogyrus paradoxus Ochs, 1928
Orectogyrus patromimus Ochs, 1929
Orectogyrus peridines Guignot, 1955
Orectogyrus perrieri Fairmaire, 1899
Orectogyrus petrinus Brinck, 1960
Orectogyrus pictimanus Régimbart, 1892
Orectogyrus polli Régimbart, 1884
Orectogyrus posticalis Ochs, 1930
Orectogyrus potamophilus Guignot, 1955
Orectogyrus probus Brinck, 1956
Orectogyrus prolongatus Régimbart, 1892
Orectogyrus pulcherrimus Zimmermann, 1916
Orectogyrus purpureus Régimbart, 1892
Orectogyrus rhodesianus Ochs, 1933
Orectogyrus riggenbachi Ochs, 1934
Orectogyrus robustus Ochs, 1925
Orectogyrus rotundatus Ochs, 1934
Orectogyrus rugulifer Régimbart, 1906
Orectogyrus rugulosus Régimbart, 1907
Orectogyrus rustibus Brinck, 1956
Orectogyrus ruwenzoricus Alwarth, 1921
Orectogyrus schistaceus (Gerstaecker, 1866)
Orectogyrus schoenherri (Dejean, 1833)
Orectogyrus schubotzi Alwarth, 1921
Orectogyrus schultzei Zimmermann, 1920
Orectogyrus semisericeus Gestro, 1881
Orectogyrus semivillosus (Dejean, 1821)
Orectogyrus sericeus (Klug in Ehrenberg, 1834)
Orectogyrus sexualis Régimbart, 1891
Orectogyrus simulans Ochs, 1928
Orectogyrus sjoestedti Régimbart, 1902
Orectogyrus socius Ochs, 1943
Orectogyrus specularis (Dejean, 1833)
Orectogyrus speculum (Aubé, 1838)
Orectogyrus spinifer Franciscolo, 1986
Orectogyrus strigicollis Guignot, 1952
Orectogyrus subseriatus Régimbart, 1886
Orectogyrus tavetensis Régimbart, 1906
Orectogyrus trilobatus Régimbart, 1884
Orectogyrus uellensis Ochs, 1928
Orectogyrus vagus Guignot, 1938
Orectogyrus vanstraeleni Ochs, 1938
Orectogyrus vedyi Ochs, 1937
Orectogyrus venustulus Ochs, 1933
Orectogyrus vermiculatus Ochs, 1952
Orectogyrus vestitus Régimbart, 1892
Orectogyrus vicinus Régimbart, 1892
Orectogyrus virescens Guignot, 1953
Orectogyrus walterrossii Franciscolo & Sanfilippo, 1986
Orectogyrus witteanus Ochs, 1938
Orectogyrus zimmermanni Ochs, 1925


== Eksterne lenker ==
Orectogyrus på GBIF [1]
(en) Orectogyrus i Global Biodiversity Information Facility 
(en) Orectogyrus hos ITIS 
(en) Orectogyrus hos NCBI 
Orectogyrus – detaljert informasjon på Wikispecies