Verhaagh, M. 1990. The Formicidae of the rain forest in Panguana, Peru: the most diverse local ant fauna ever recorded. Pp. 217-218 in: Veeresh, G. K.; Mallik, B.; Viraktamath, C. A. (eds.) 1990. Social insects and the environment. Proceedings of the 11th International Congress of IUSSI, 1990. New Delhi: Oxford & IBH Publishing Co., xxxi + 765 pp. PDF

Verhaagh, M. 1991. Clearing a tropical rain forest - effects on the ant fauna. Pp. 59-68 in: Erdelen, W.; Ishwaran, N.; Müller, P. (eds.) 1991. Tropical ecosystems: systems characteristics, utilization patterns, and conservation issues. Weikersheim: Margraf Scientific Books, 202 pp.

Verhaagh, M.; Rosciszewski, K. 1994. Ants (Hymenoptera, Formicidae) of forest and savanna in the Biosphere Reserve Beni, Bolivia. Andrias 13:199-214.

Verhaagh, M. 1994a. Pachycondyla luteola (Hymenoptera, Formicidae), an inhabitant of Cecropia trees in Peru. Andrias 13:215-224.

Verhaagh, M. 1994b. Neue Fundstellen einiger Ameisen in Südwestdeutschland. Carolinea 52:115-118.

Verhaagh, M. 1996. Warum die älteste bekannte Ameise keine ist (Hymenoptera). Beiträge der Hymenopterologen-Tagung in Stuttgart 1996:11. PDF

Brandão, C. R. F.; Verhaagh, M.; Diniz, J. L. M. 2002. A new ant subfamily from Central Amazon soil samples. [Abstract.]. P. 159 in: Billen, J. P. J. 2002. XIV International Congress of IUSSI. The Golden Jubilee Proceedings. 27 July - 3 August 2002, Hokkaido University, Sapporo, Japan. Sapporo: XIV International Congress of IUSSI, 233 pp.

Ketterl, J.; Verhaagh, M.; Bihn, J. H.; Brandão, C. R. F.; Engels, W. 2003. Spectrum of ants associated with Araucaria angustifolia trees and their relations to hemipteran trophobionts. Studies on the Neotropical Fauna and Environment 38:199-206. PDF

Ketterl, J.; Verhaagh, M. 2004. Acanthoponera mucronata (Roger, 1860) (Hymenoptera: Formicidae), first record in Peru and Rio Grande do Sul, Brazil, with description of its male. Revista Peruana de Entomología 44:65-68. PDF

Ketterl, J.; Verhaagh, M.; Dietz, B. H. 2004. Eurhopalothrix depressa sp. n. (Hymenoptera: Formicidae) from southern Brazil with a key to the Neotropical taxa of the genus. Studies on the Neotropical Fauna and Environment 39:45-48. PDF

Verhaagh, M. 2005. Diversität und Ökologie von Ameisen in neotropischen Regenwäldern (Hymenoptera, Formicidae). Entomologie Heute 17:119-145.

Klingenberg, C.; Verhaagh, M. 2005. Myrmecology in the internet: possibilities of information gathering (Hymenoptera, Formicidae). Beiträge zur Entomologie 55:485-498. PDF

Bihn, J. H.; Verhaagh, M. 2007. A review of the genus Mystrium (Hymenoptera: Formicidae) in the Indo-Australian region. Zootaxa 1642:1-12. PDF

Rabeling, C.; Verhaagh, M.; Engels, W. 2007. Comparative study of nest architecture and colony structure of the fungus-growing ants, Mycocepurus goeldii and M. smithii. Journal of Insect Science 7: Article 40 (available online: insectscience.org/7.40).

Rabeling, C.; Verhaagh, M. 2008. [Untitled. Subfamily Martialinae Rabeling & Verhaagh, subfam. nov. Martialis heureka Rabeling & Verhaagh, gen. et sp. nov.]. Pp. 14913-14915 in: Rabeling, C.; Brown, J. M.; Verhaagh, M. 2008. Newly discovered sister lineage sheds light on early ant evolution. Proceedings of the National Academy of Sciences of the United States of America 105 (30):14913-14917. PDF

Rabeling, C.; Brown, J. M.; Verhaagh, M. 2008. Newly discovered sister lineage sheds light on early ant evolution. Proceedings of the National Academy of Sciences of the United States of America 105 (30):14913-14917. PDF

Heil, M.; Gonzalez-Teuber, M.; Clement, L. W.; Kautz, S.; Verhaagh, M.; Bueno, J. S. 2009. Divergent investment strategies of Acacia myrmecophytes and the coexistence of mutualists and exploiters. Proceedings of the National Academy of Sciences of the United States of America 106:18091-18096. PDF