▁gauge ▁rail ways ▁in ▁Japan ▁Category : 1 9 5 7 ▁establish ments ▁in ▁Japan <0x0A> </s> ▁S col op ost eth us ▁trop icus ▁is ▁a ▁species ▁of ▁d irt - color ed ▁seed ▁bug ▁in ▁the ▁family ▁R hy par och rom idae . ▁It ▁is ▁found ▁in ▁Central ▁America ▁and ▁North ▁America . ▁ ▁References ▁ ▁Category : R hy par och rom idae ▁Category : Art icles ▁created ▁by ▁Q bug bot ▁Category : In sect s ▁described ▁in ▁ 1 8 8 2 <0x0A> </s> ▁At ri ost ella ▁is ▁a ▁genus ▁which ▁belongs ▁to ▁the ▁family ▁Micro cot yl idae ▁and ▁class ▁Mon ogene a . ▁ ▁As ▁all ▁Mon ogene a , ▁species ▁of ▁At ri ost ella ▁are ▁e ct op ar as ites ▁that ▁affect ▁their ▁host ▁by ▁att aching ▁themselves ▁as ▁lar va e ▁on ▁the ▁g ills ▁of ▁the ▁fish ▁and ▁grow ▁into ▁adult ▁stage . ▁This ▁lar val ▁stage ▁is ▁called ▁on com i rac id ium , ▁and ▁is ▁character ized ▁as ▁free ▁sw imming ▁and ▁c ili ated . ▁ ▁This ▁genus ▁was ▁proposed ▁by ▁Un n ith an ▁in ▁ 1 9 7 1 ▁who ▁included ▁in ▁this ▁genus ▁two ▁sub gener a : ▁the ▁sub gen us ▁At ri ost ella ▁with ▁a ▁single ▁m idd ors al ▁un ar med ▁v ag inal ▁p ore ; ▁and ▁the ▁sub gen us ▁B ip lac un ella ▁with ▁a ▁vent ral ▁cut icular ▁post - at rial