Family Opisotretidae Hoffman, 1980

Diagnosis.

Sphaerotrichomes absent. Gonopod aperture large, transversely oval, with small and largely exposed coxites. Telopodites elongate, directed strongly dorsolaterad; seminal groove running along most of telopodite extent on caudal face to terminate distally either on a special branch or tooth (= solenomere), flush on caudal surface, or debauch inside an accessory seminal chamber which normally is supplied with a hairy pulvillus.

Type genus.

Opisotretus Attems, 1907

Contents and distribution.

Only seven genera and 29 described species ranging from the Ryukyu Islands, Japan, Taiwan, southern mainland China and the Himalayas in the North and Northwest, through Indochina and across Indonesia, to Papua New Guinea in the Southeast (Golovatch et al. 2013).