Novel plumage aberrations in Paraguayan non-Passerine Birds, and the definition of a new plumage aberration unique to Psittacidae

by Paul Smith, Sergio D. Ríos
Published 2017-07-01

A melanic form of Homothermon praemorsus (Burmeister) (Coleoptera: Scarabaeidae: Rutelinae) from Paraguay

by Sergio D. Ríos, Bolívar R. Garcete-Barrett, Carlos A. Aguilar Julio
Published 2019-11-01

Notes on the geographic distribution and subspecific taxonomy of Sais rosalia (Cramer) (Lepidoptera, Nymphalidae, Ithomiini), including the first records in Paraguay

by Sergio D. Ríos Díaz, Fernando M. S. Dias, Mirna M. Casagrande, Olaf H. H. Mielke, Gerardo Lamas
Published 2014-03-01