Neoephemera

 ( Mayflies ) 

Neoephemera is a genus of large squaregill mayflies in the family Neoephemeridae first described by McDunnough (1925). and containing approximately six described species in Neoephemera.

• Neoephemera bicolor
• Neoephemera compressa
• Neoephemera maxima
• Neoephemera projecta
• Neoephemera purpurea
• Neoephemera youngi

An extinct species, Neoephemera antiqua, has also been assigned to the genus. The species is known only from the type locality in the Ypresian Klondike Mountain Formation of northeast Central Washington state.

• (2025). 9780849302121, CRC Press. . ISBN 9780849302121
• (1990). 9789401075794, Springer. ISBN 9789401075794
• (2025). 9789401539425, Springer Science & Business Media. ISBN 9789401539425