Systematic Revision Of The Phorusrhacidae (Aves: Ralliformes) Author Alvarenga, Herculano M. F. Museu de História Natural de Taubaté. Rua Colômbia, 99, CEP 12030 - 520, Taubaté, SP, Brasil. halvarenga@uol.com.br Author Höfling, Elizabeth Departamento de Zoologia, Instituto de Biociências, Universidade de São Paulo, Caixa Postal 11.294, CEP 05422 - 970, São Paulo, SP, Brazil. text Papéis Avulsos de Zoologia 2003 2003-12-31 43 4 55 91 journal article 10.1590/S0031-10492003000400001 1807-0205 4900701 Genus Andrewsornis Patterson, 1941 Type Species – Andrewsornis abbotti Patterson, 1941 . Included Species – Only the type species. Distribution – Middle to Upper Oligocene of Argentina . Diagnos i s Revised – The largest of the known Patagornithinae . On the skull, the rostral edge of the antorbital fenestra is very inclined. When compared with Patagornis and Andalgalornis , the mandibular symphysis is proportionally smaller and the mandibular fenestra bigger and oval-shaped ( Fig. 26A ).