Abstract
As the invasive murine rodents have too often been neglected in Neotropical faunal inventories, a synthesis on the presence of the House mouse, the Black rat, and the Norway rat was ascertained for French Guiana. We relied on preserved museum-specimens, on caught and released animals, on identified remains extracted from Barn owl (Tyto alba) pellets, and on bona-fide visual observations. The aggregated data allowed documenting the presence of at least one invasive Murinae in 31 localities throughout the country. Most observations and/or captures concern the northern coastal areas, where the vast majority of villages and cities are to be found. All three murines were found together in only two localities (Sinnamary; Cayenne) whereas globally the most frequent species was Rattus rattus, followed by Mus musculus, and finally R. norvegicus. Invasive murines were also found on five offshore islands, and the House mouse was caught in an isolated gold-mining camp in the center of the country. Biometric data are provided for characterizing some external and cranio-dental variables in M. musculus and R. rattus. Owl pellets materials indicate that both species of Rattus can be easily sorted by the crown-length non-overlapping values of their upper and/or lower molars.