Nymphs of Cincticostella levanidovae (Ts-hernova), were col looted from a headwater stream in Ht. Jumbong in the northern paf of Korea. They showed a univoltine winter life cycle. The youngest nymphs were collected in July and the adults appeared to emerge from early April through June in next year. The cohort production interval for the species was estimated as 340 days. The annual secondary production (ash free dry weight) was estimated by the increment-summation method and the size-frequency method, being calculated as 488 and 708 $mg{cdot}m^{-2}{circ}yr^{-1}$, respectively. Cut content analysis showed that C. levanidovae is a detritivore and could be categorized as a collector-gatherer.