File:Heptageniidae incertae sedis (Lewis, 1992) plate1, fig B.png

Heptageniidae_incertae_sedis_(Lewis,_1992)_plate1,_fig_B.png(385 × 324 pixels, file size: 111 KB, MIME type: image/png)

Summary

Description
English: Lewis (1992) fig B) Ephemeropterans; Family Heptageniidae, immature

Described by Sinitchenkova (1999) as Neoephemera antiqua

51-49 million years old, Ypresian, Klondike Mountain Formation, Republic, Washington

University of Washington, Burke Museum specimen #UWBM 57158
Date
Source (1992). "Insects of the Klondike Mountain Formation, Republic, Washington". Washington Geology 20 (3): 15–19.
Author Lewis, S.E. 1992

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September 1992

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