''Penelomax'' is a genus of spiny crawler mayflies in the family

Ephemerellidae Ephemerellidae are known as the spiny crawler mayflies. They are a family of the order Ephemeroptera. There are eight genera consisting of a total 90 species (Merritt & Cummins). They are distributed throughout North America as well as the UK. T ...

. There is one described species in ''Penelomax'', ''P. septentrionalis''.

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