(In this photo -- the spiny crawler mayfly Timpanoga hecuba. This is a species -- and genus -- that does not occur in our part of the country. In late summer, these nymphs are plentiful in many Montana rivers.)
Note: In yesterday's entry, the wrong photo was posted as Cinygmula subaequalis. I have corrected the error. Please have another look at that entry.)
Ephemerellidae (Spiny Crawler Mayflies)
1. Drunella cornutella. Size: 6.4-8.5 mm; Season: Sping into Summer
2. Drunella tuberculata. Size: 7-9 mm; Season: Spring.
3. Drunella walkeri. Size: 8-10 mm; Season: Spring.
4. Ephemerella dorothea. Size: 6-8 mm; Season: Spring. (colors and patterns vary)
5. Ephemerella invaria. Size: 6-13 mm. Season: Winter into Spring. (colors and patterns vary)
8. Eurylophella sp. (funeralis?)
8. Serratella serrata/Serratella carolina. Size: 4-6 mm; Season: Summer.
9. Serratella serratoides. Size: 6-7 mm; Season: Summer.
10. Telagnopis deficiens (formerly Serratella deficiens). Size: 5-6 mm; Season: Summer