Bug Of The Week

- KINGDOM Animalia

- SUBKINGDOM Eumetazoa

- PHYLUM Arthropoda

- SUBPHYLUM Hexapoda

- CLASS Insecta

- ORDER Ephemeroptera

- FAMILY Heptageniidae

- GENUS Rhithrogena

- SPECIES semicolorata

Rhithrogena semicolorata  (Imago  Male)

Most liklely found between

R. semicolorata is an is in Europe widely spread and its hatches are important for the fly angler.

During May and June I often come across hatches and its spinner fall at dusk has often gave nice trouts on spent imitations.

It is a medium size mayfly with a body of 10-12 mm.

In spite of the english name (yellow upright) its habitus as spinner is more rusty orange to me.

Genitalia detail, ventral view: R.semicolora typical penis lobus