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Two Co-inhabiting Burrowing Mayflies, Ephemera orientalis and E. sachalinensis, in Korean Streams (Ephewmeroptera: Ephemeridae)  

Hwang, Jeong-Mi (Department of Biology, Seoul Women's University)
Lee, Sung-Jin (Department of Biology, Seoul Women's University)
Bae, Yeon-Jae (Department of Biology, Seoul Women's University)
Publication Information
Korean Journal of Ecology and Environment / v.36, no.4, 2003 , pp. 427-433 More about this Journal
Abstract
We provided diagnostic characters of the adult and larval stages of two co-inhabiting species of ephemerid burrowing mayflies, Ephemera orientalis and E. sachalinensis (new record to South Korea) (Ephemeroptera: Ephemeridae), in Korean streams. E. sachalinensis (mean${\pm}$sd body length male adult 18.44${\pm}$0.70 mm, female adult 21.46${\pm}$0.45 mm) is larger in body length than E. orientalis (male adult 13.92${\pm}$0.04 mm, female adult 15.27 ${\pm}$ 0.48 mm), and can be distinguished by male genitalia, forewing markings, and stripes on the abdominal terga Vl-lX. The mature larvae of E. sachalinensis differ from those of E. orientalis in having a deeper and more divergent head frontal process. Their body size distributions and additional ecolegical findings are discussed.
Keywords
body size distribution; burrowing mayflies; Ephemera; habitat; morphological diagnosis;
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