The immatures of Spinelli & Ronderos, 2001 (Diptera, Ceratopogonidae).

The fourth instar larva and the pupa of Spinelli & Ronderos, 2001 are described for the first time. The immature stages were collected from macrophytes and filamentous algae in streams of the Patagonian steppe, in the provinces of Neuquén and Chubut, Argentina. The described stages were photographed and illustrated with a phase-contrast microscope and scanning electron microscope.