The little-known mayfly Siphlonurus autumnalis McDunnough (Ephemeroptera: Siphlonuridae) was collected from several locations in its floodplain habitats along the Middle Fork of the Flathead River in western Montana. To confirm identification, nymphs were reared along with an associated species, S.occidentalis Eaton (Ephemeroptera: Siphlonuridae). Adults emerged from 6 September until 16 October. Habitats are described and the first photos of the 2 sexes are provided.
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1 December 2009
Note on the Occurrence of Siphlonurus autumnalis (Ephemeroptera: Siphlonuridae) in a Montana Spring Brook
Robert L. Newell,
Michelle L. Anderson
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Western North American Naturalist
Vol. 69 • No. 4
December 2009
Vol. 69 • No. 4
December 2009
emergence
habitats
mayfly
Montana
Siphlonurus autumnalis
spring brook