Guillem, R. 2010. A survey of the ants of Minorca (Hymenoptera: Formicidae) with two new species for the island: Hypoponera punctatissima (Roger, 1859) and Temnothorax algiricus (Forel, 1894). Boletín de la Asociación Española de Entomologia 33:447-460.
Guillem, R. and K. Bensusan. 2008. Technomyrmex vexatus (Santschi, 1919) from Gibraltar (Hymentoptera: Formicidae) a new ant species for Europe and genus for Iberia. Myrmecological News 11: 21-23.
Guillem, R. and K. Bensusan. 2009. Tetramorium parvioculum sp. n. (Formicidae: Myrmicinae), A new species of the T. simillmum group from Gibraltar. Boletin Sociedad Entomoligica Aragonesa, 45: 157-161.
Guillem, R.; Bensusan, K.; Torres, J. L.; Perez, C. 2010. The genus Pyramica Roger, 1862 (Hymenoptera: Formicidae) in Cádiz province (southern Spain), with a description of methods for their capture. Boletín de la Asociación Española de Entomologia 33:461-468.
Tinaut, A.; Bensusan, K.; Guillem, R. 2011. Redescription of the queen of Anochetus ghilianii (Spinola, 1851) (Hymenoptera, Formicidae). Boletín de la Asociación Española de Entomologia 35(1-2):157-167.
C Malumphy, R Guillem, C Perez, K Bensusan (2020) Insect pest species of Eucalyptus in Gibraltar. Entomologists Monthly Magazine, No.1, January-March 2020, pp 51-57. doi:10.31184/M00138908.1561.4010
C Malumphy & R Guillem (2020) First records of Cacopsylla fulguralis (Kuwayama) and Macrohomotoma gladiata Kuwayama in Gibraltar (Hemiptera: Psylloidea). Entomologist’s Monthly Magazine, 156: 7-10. [Affiliation given as Gibraltar Botanic Gardens]. doi: 10.31184/M00138908.1561.4016
Rhian M Guillem, Falko P Drijfhout, Stephen J Martin (2016) Species-specific cuticular hydrocarbon stability within European Myrmica Ants. Journal of Chemical Ecology, published online. doi:10.1007/s10886-016-0784-x