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 Psilopterus bachmanni (Moreno & Mercerat, 1891) comb. n. Patagornis bachmanni Moreno & Mercerat, 1891 (pp. 24 and 58). Ilustrations – Sinclair & Farr (1932) and Moreno & Mercerat (1891). Remarks – Patagornis bachmanni has priority over Psilopterus communis (both of Moreno & Mercerat, 1891). Psilopterus minutus Ameghino, 1981 , dealt with as a separate species by Brodkorb (11967), is represented only by an incomplete tarsometatarsus, inseparable from P. bachmanni (v. Sinclair & Farr, 1932:188). FIGURE 29. Proximal end of the right tarsometatarsus, plantar view, showing the variation of the hipotarsus in the three genera of the Psilopterinae : A - Procariama simplex ; B - Psilopterus lemoinei and C - Paleopsilopterus itaboraiensis . Psilopterus communis Moreno & Mercerat, 1891 (pp. 26 and 68); Brodkorb, 1967. Psilopterus intermedius Moreno & Mercerat, 1891 (pp. 26 and 68); Brodkorb, 1967 (syn. of P. communis ). Phororhacos delicatus Amegino, 1891; Brodkorb, 1967, (syn. of P. communis ). Pelecyornis pueyrredonensis Sinclair & Farr, 1932 ; Brodkorb 1967 (syn. of P. communis ). Lectotype – (by present designation): proximal portion of the left tarsometatarsus (MLP-168). Hypodigm – lectotype . A proximal and a distal portion of a femur (MLP-165-166) and a distal portion of the tibiotarsus, all of the left side (MLP-167), which appear to be associated to the lectotype . An almost complete skeleton (PUM-15.904), described and pictured by Sinclair & Farr (1932). Horizon and Locality – Middle Miocene (Santacrucian) of Argentina , Santa Cruz Province : Santa Cruz , Lake Pueyrredon , Monte Observación, La Cueva . Diagnos i s Revised – Perhaps the smallest of all the known Phorusrhacidae ( Fig. 1E ), estimated at being between 70 to 80 centimeters high, rivalling only Psilopterus affinis in size. Relatively low skull and upper maxilla, in height ( Fig. 26I ), presenting a certain similarity with the Mesembriornithinae . Differences with P. lemoinei as to the different segments of the skeleton are well described by Sinclair & Farr (1932). A peculiarity of P. bachmanni is to be found in the extremely slanted rostral edge of the antorbital fenestra, very different from P. lemoinei ( Figs. 26G and 26I ). Measurements – Table 8 and Sinclair & Farr (1932).