Parra-H A, R Ospina-Torres, S Ramírez (2006) Euglossa natesi, a new species of orchid bee from the Chocó Region of Colombia and Ecuador (Hymenoptera: Apidae). Zootaxa 1298: 29-36.
Ramírez SR, B Gravendeel, RB Singer, CR Marshall, NE Pierce (2007) Dating the origin of the Orchidaceae from a fossil orchid with its pollinator. Nature 448:1042-1045
Media coverage:
Ramírez, SR T Eltz, MK Fujiwara, B Goldman-Huertas, G Gerlach, ND Tsutsui, NE Pierce (2011) Asynchronous diversification in a specialized plant-pollinator mutualism. Science 333:1742-1746
Zimmermann, Y, SR Ramírez, T Eltz (2009) Chemical niche differentiation among sympatric orchid bees. Ecology 90(11): 2994-3008.
Miscellaneous projects: