1999

• Krabbe, N., Isler, M.L., Isler, P.R., Whitney, B.M., Álvarez A., J. & Greenfield, P.J.. 1999. A new species in the Myrmotherula haematonota superspecies (Aves: Thamnophilidae) from the western amazonian lowlands of Ecuador and Peru. The Wilson Bulletin 111 (2): 157–165. Full article (PDF).Reference page. 

• Isler, M.L., Isler, P.R. & Whitney, B.M. 1999. Species limits in antbirds (Passeriformes: Thamnophilidae): the Myrmotherula surinamensis complex. The Auk 116(1):83-96. Full article (PDF) Reference page. 

2001

• Isler, M.L.; Álvarez A., J.; Isler, P.R. & Whitney, B.M. (2001). A new species of Percnostola antbird (Passeriformes: Thamnophilidae) from Amazonian Peru, and an analysis of species limits within Percnostola rufifrons. The Wilson Bulletin 113:164–176. DOI: 10.1676/0043-5643(2001)113[0164:ANSOPA]2.0.CO;2 Full article PDFReference page. 

2002

• Isler, M. L., Álvarez A., J., Isler, P.R., Valqui, T., Begazo, A. & Whitney, B.M. 2002. Rediscovery of a cryptic species and description of a new subspecies in the Myrmeciza hemimelaena complex (Thamnophilidae) of the Neotropics. The Auk 119: 362–378 Full article view DOI: 10.1642/0004-8038(2002)119[0362:ROACSA]2.0.CO;2 Reference page. 

2003

• Isler, M.L. & Isler, P.R. 2003. Species limits in the pygmy antwren complex (Aves: Passeriformes: Thamnophilidae); 1. The taxonomic status of Myrmotherula brachyura ignota. Proceedings of the Biological Society of Washington. 116(l):23-28. Full article (PDF)Reference page. 

2005

• Braun, M.J., Isler, M.L., Isler, P.R., Bates, J.M. & Robbins, M.B.. 2005. Avian speciation in the Pantepui: the case of the Roraiman Antbird (Percnostola [Schistocichla] "leucostigma" saturata). Condor 107:327-341. DOI: 10.1650/7647 Full Article (PDF)Reference page. 

2006

• Isler, M. L., D. R. Lacerda, P. R. Isler, S. J. Hackett, K. V. Rosenberg, and R. T. Brumfield. 2006. Epinecrophylla, a new genus of antwrens (Aves: Passeriformes: Thamnophilidae). Proceedings of the Biological Society of Washington 119(4):522-527. DOI: 10.2988/0006-324X(2006)119[522:EANGOA]2.0.CO;2 Full article viewReference page. 

2007

• Isler, M.L., Isler, P.R. & Whitney, B.M. (2007). Species limits in Antbirds (Thamnophilidae): The Warbling Antbird (Hypocnemis cantator) complex. Auk 124(1): 11–28. DOI: 10.1642/0004-8038(2007)124[11:SLIATT]2.0.CO;2 Reference page. 

• Isler, M.L., Isler, P.R., Whitney, B.M. & Zimmer, K.J. 2007. Species limits in the "Schistocichla" complex of Percnostola antbirds (Passeriformes: Thamnophilidae). Wilson Journal of Ornithology 119: 53:70. DOI: 10.1676/05-121.1 Full article viewReference page. 

2008

• Isler, M.L., Isler, P.R. & Whitney, B.M. 2008. Species limits in antbirds (Aves: Passeriformes: Thamnophilidae): an evaluation of Plumbeous Antvireo (Dysithamnus plumbeus) based on vocalizations. Zootaxa 1726: 60–68. Full article viewReference page. 

2009

• Isler, M.L., Isler, P.R, Whitney, B.M., Zimmer, K.J. & Whittaker, A. 2009. Species limits in antbirds (Aves: Passeriformes: Thamnophilidae): an evaluation of Frederickena unduligera (Undulated Antshrike) based on vocalizations. Zootaxa, 2305: 61-68. Full article viewReference page.