Mayfly Genus Stenonema

"Stenonema" as we knew it is no more.

The name is still popular with anglers, but entomologists recently moved all the best-known species to a new genus, Maccaffertium.

For instance, the "March Brown" Stenonema vicarium is now Maccaffertium vicarium. It is a shame that the new scientific name of many popular species rolls off the tongue less easily.

Some years ago, between the writing of angling classics like Matching the Hatch and more modern references, some important species we know as Light Cahills were moved from Stenonema to the genus Stenacron. Most modern anglers are familiar with this update.

Only one species remains in the Stenonema genus: Stenonema femoratum.

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