Oral Presentation- Symposium 12th International Mammalogical Congress

Introduction to the systematics of Peruvian forms of Caenolestes caniventer (Paucituberculata: Caenolestidae) (#389)

Víctor Pacheco 1 , Dennisse Ruelas 1 , Mercedes Molina 1 , Luz Segura 1 , Mónica Arakaki 1 , Dan Vivas 1 , Nadia Espinoza 1 , Isabel Centeno 1
  1. Museo de Historia Natural, Universidad Nacional Mayor de San Marcos, Jesús María, LIMA, Peru

Caenolestes caniventer is a shrew opossum widely distributed in the mountain forests of southern Ecuador and northern Peru, where the Huancabamba depression (HD) was considered as its southern limit of distribution. Currently, this species is considered monotypic, however C. sangay from the eastern of Ecuador was recently differentiated from C. caniventer by molecular analysis prompting us to re-examine Peruvian populations. We performed a morphological and morphometric study, and a phylogenetic analysis of mitochondrial DNA sequences, for Peruvian populations. We found that populations known as caniventer, correspond to two different clades. The first includes to C. sangay which is sister group to two hypothetical new taxa: Caenolestes sp. 1, from Cañaris (Lambayeque) and La Granja (Cajamarca), south of the HD; and Caenolestes sp. 2, from Río Majaz (Piura), north of the HD. These putative taxa are different from C. sangay with a genetic distance of 8.8-9.1% and 7.5% respectively. The second clade that apparently comprise the true C. caniventer includes the populations from Huamantanga and Las Ashitas (Cajamarca), and Alto Samaniego (Piura), and differs from the first by no less than 6%. A canonical component analysis with 58 specimens, assigned to C. caniventer from Peru, recognised these groups. Therefore, morphological, morphometric and molecular analysis suggest that Caenolestes sp. 1 and sp. 2 are likely new species related to C. sangay. The biogeography of C. caniventer complex does not fit with the hypothesis of HD as a barrier.