▁system atic ▁zo ology ▁in ▁the ▁Museum ▁of ▁Zo ology ▁at ▁the ▁University ▁of ▁Ber gen ▁from ▁ 1 9 7 7 ▁to ▁his ▁ret irement ▁in ▁ 2 0 0 6 . ▁He ▁special ized ▁in ▁aqu atic ▁D ip tera , ▁especially ▁Ch ir onom idae ▁and ▁Cha ob or idae . ▁He ▁p enn ed ▁about ▁ 2 6 5 ▁academic ▁publications ▁( more ▁than ▁ 5 , 5 0 0 ▁pages ); ▁author ed ▁or ▁co - author ed ▁ 3 ▁sub famil ies , ▁ 4 2 ▁gener a ▁or ▁sub gener a , ▁and ▁more ▁than ▁ 3 0 0 ▁species ; ▁and ▁was ▁a ▁member ▁of ▁the ▁editor ial ▁board ▁of ▁the ▁journ als ▁Aqu atic ▁In sect s ▁and ▁Act a ▁Zo olog ica e ▁Academ iae ▁Scient ar um ▁Hung ar ica e . ▁He ▁received ▁an ▁honor ary ▁degree ▁at ▁N ank ai ▁University ▁in ▁ 2 0 0 0 ▁and ▁was ▁an ▁honor ary ▁member ▁of ▁the ▁Finn ish ▁Ent om ological ▁Society . ▁▁ ▁The ▁fest schrift ▁Cont ribution s ▁to ▁the ▁System at ics ▁and ▁E col ogy ▁of ▁Aqu atic ▁D ip tera : ▁A ▁T ribute ▁to ▁Ole ▁A . ▁S æ ther ▁was ▁released ▁for ▁his ▁sevent i eth ▁birth day . ▁The ▁gener a ▁Sa ether ia , ▁Sa ether iella , ▁Sa ether omy ia , ▁Sa ether oc lad ius , ▁Sa ether oc rypt us , ▁Sa ether ops , ▁Ole ia ,