In press
20. Dong-Hwan, C, SR Ramírez, ND Tsutsui. A silica-based method for the extraction of surface hydrocarbons from insects Journal of Chemical Ecology.
2011
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19.Eltz T, F Fritzsch, JR Pech, Y Zimmermann, JG Quezada-Euan, SR Ramírez, B Bembé (2011) Characterization of the orchid bee Euglossa viridissima and a new cryptic sibling species by morphological, chemical, and genetic characters Zoological Journal of the Linnean Society 163: 1064-1076 [PDF]
18. 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 [PDF | suppl.pdf]
2010
17. Lopez-Uribe M, Green A, Ramírez SR, Bogdanowicz S, Danforth BN (2010) Isolation and cross-species characterization of polymorphic microsatellites for the orchid bee Eulaema meriana (Hymenoptera: Apidae: Euglossini) Conservation Genetics Resources DOI10.1007/s12686-010-9271-9 [PDF]
16. Ramírez SR, T Eltz, F Fritzsch, R Pemberton, EG Pringle, ND Tsutsui (2010) Intraspecific geographic variation of fragrances acquired by orchid bees in native and introduced populations. Journal of Chemical Ecology 36: 873-884 [PDF | suppl.pdf]
15. Ramírez SR, DW Roubik, C Skov, NE Pierce (2010) Phylogeny, diversification patterns and historical biogeography of euglossine orchid bees (Hymenoptera: Apidae). Biological Journal of the Linnean Society. 100(3): 552-572 [PDF | suppl.pdf]
14. Ramírez SR, C Nieh, TB Quental, DW Roubik, VL Imperatriz-Fonseca, NE Pierce (2010) A molecular phylogeny of the stingless bee genus Melipona (Hymenoptera: Meliponini). Molecular Phylogenetics and Evolution 56(2): 519-525 [PDF | suppl.pdf]
2009
13. Ramírez SR (2009) Orchid bees. Current Biology 19(2):1061-1063. [PDF]
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12.Zimmermann, Y, SR Ramírez, T Eltz (2009) Chemical niche differentiation among sympatric orchid bees. Ecology 90(11): 2994-3008. [PDF] cover feature
2008
11. Singer, RB, B Gravendeel, H Cross, SR Ramírez (2008) Structural variation, taxonomic utility and evolutionary patterns of orchid pollinia. Selbyana 29(1): 6–19.[PDF]
2007
10. 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 [PDF | suppl_mat. | Media ] cover feature
2006
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9.Ramírez, S (2006) Euglossa samperi n. sp., a new species of orchid bee from the Ecuadorian Andes (Hymenoptera:Apidae). Zootaxa 1272: 61-68. [PDF]
7. 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. [PDF]
2004-5
7. Ramírez, S (2005) Euglossa paisa, a new species of orchid bee from the Colombian Andes (Hymenoptera: Apidae). Zootaxa 1065: 51-60. [PDF]
2003
6. Nieh, JC, FAL Contreras, S Ramírez, VL Imperatriz-Fonseca (2003) Variation in the communication of resource height by stingless bees from different habitats Animal Behaviour 66: 1129–1139. [PDF]
5. Nieh, JC, S Ramírez, P Nogueira-Neto (2003) Multi-source odor-marking of food by a stingless bee, Melipona mandacaia Behavioral Ecolology and Sociobiology 54: 578-586. [PDF]
4. Ramírez, S, SA Cameron (2003) Army ant attacks by Eciton hamatum and E. rapax on nests of the Amazonian bumble bee, Bombus transversalis (Hymenoptera: Apidae) Journal of the Kansas Entomological Society 76 (3): 533-535. [PDF]
2002
3. Ramírez, S, RL Dressler, M Ospina (2002) Euglossine bees (Hymenoptera: Apidae) from the Neotropical Region: A species checklist with notes on their biology Biota Colombiana 3 (1): 7-118. [PDF]
2001
2. Cameron, SA & S Ramírez (2001) Nest architecture and nesting ecology of the orchid bee Eulaema meriana (Hymenoptera: Apinae: Euglossini) Journal of the Kansas Entomological Society 74 (3): 142-165. [PDF]
1. Whitfield, JB, SA Cameron, S Ramírez, K Roesch, S Messinger, OM Taylor & D Cole (2001) Review of the Apanteles species (Hymenoptera: Braconidae) attacking Lepidoptera in Bombus (Hymenoptera: Apidae) colonies in the New World, with description of a new species from South America. Annals of the Entomological Society of America 94(6): 851-857. [PDF]
