Systematics, biogeography, and diversification of Scytalopus tapaculos (Rhinocryptidae), an enigmatic radiation of Neotropical montane birds. Issue 4 (20th August 2020) - Cadena, Carlos Daniel; Cuervo, Andrés M; Céspedes, Laura N; Bravo, Gustavo A; Krabbe, Niels; Schulenberg, Thomas S; Derryberry, Graham E; Silveira, Luis Fabio; Derryberry, Elizabeth P; Brumfield, Robb T; Fjeldså, Jon