Order: Polykinetids on both left and right oral walls; mouth apical; oral cavity like a large pouch; carnivorous (Illustrated Guide, 1985).
Family:
Genus:

Bursaria sp. 3 clips Yanase river Fujimi Saitama, 1999

Bursaria sp. 3 clips Akigase park Saitama Saitama, 1998