Fandiorano

vignette|143x143px|Gyrinus substriatus
Ny fandiorano dia bibikely maintimainty isan-karazany toy ny tsikovoka kely, izay mamorona ny fianakaviana Gyrinidae, ao amin' ny filaharana  Coleoptera, miaina amin' ny ranomamy. Kinga izy ireo raha hilomano sady manao manao antsitrika ka mbetika anaty rano mbentika mitranga.

 Fanasokajiana anatiny 
vignette|156x156px|Heterogyrus milloti
Indreto ny vondron-karazana ao amin' ny Gyrinidae izay mbola velona (tsy lany tamingana):

 Aulonogyrus Motchulsky, 1853
 Dineutus MacLeay, 1825
 Enhydrus Laporte, 1835
 Gyretes Brullé, 1835
 Gyrinus Geoffroy, 1762
 Heterogyrus Legros, 1953 - Madagasikara (karazana tokana: Heterogyrus milloti)
 Macrogyrus Régimbart, 1882 (anisany ny Andogyrus Ochs, 1924)
 Metagyrinus Brinck, 1955
 Orectochilus Dejean, 1833
 Orectogyrus Régimbart, 1884
 Patrus Aubé, 1836
 Porrorhynchus Laporte, 1835
 Spanglerogyrus Folkerts, 1979 - Amerika Avaratra

 Ohabolana 
vignette|Fandiorano
Indreto ny ohabolana malagasy momba ny fandiorano:

 Toy ny fandiorano ny ratsy: koa miseho, tsy menatra olona; misitrika, tsy valahara.
 Toy ny fandiorano, ka mainty ambonin' ny rano.
 Tsikovoka sy fandiorano: rano no iraisana, fa ny fomba samy manana ny azy.