Janzena is a monotypic moth genus in the family Erebidae. It was first described by James T. Troubridge in 2020.Troubridge, J.T., 2020. A new genus and 37 new noctuoid species from peninsular Florida and the Keys (Lepidoptera: Noctuoidea). - Insecta Mundi 0789: 1–56: 7
The genus contains a single species, Janzena pyraliformis, which is found in Costa Rica, Florida and Puerto Rico.funet.fi
Etymology Gender feminine. This genus is named to honor Dr. Daniel H. Janzen.
Host plant In Costa Rica its larvae are common on Cassia sp.
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