Oxymycterus, Waterhouse, 1837

Bezerra, Alexandra Maria Ramos, Bonvicino, Cibele Rodrigues, Oliveira, Leony Dias de, Castiglia, Riccardo & Lazar, Ana, 2025, New data on the rare Oxymycterus itapeby and the Anajatuba hantavirus host Oligoryzomys mattogrossae (Rodentia: Cricetidae): the importance of surveys in challenging-to-access environments in the Brazilian Cerrado, Journal of Natural History 59 (17 - 20), pp. 1227-1247 : 1235

Phylogeny of the genus Oxymycterus

Phylogenetic trees with 13 species of the genus Oxymycterus produced the topology in Figure 4 (A) and confirmed the genus as monophyletic (96% bootstrap for ML, 0.99 posterior probability for BI). The conspecificity of the two new samples (ARB 872/MPEG 46615 and ARB 874/MPEG 46617) with O. itapeby is supported by the very low level of divergence with respect to the type series (range 1–1.5%), including the holotype, and the support of the clade including all the O. itapeby haplotypes (99% bootstrap for ML, 0.78 posterior probability for BI). This result was also retrieved in the TCS network ( Figure 4 (B), which shows the similarity between O. delator and O. amazonicus for the mt-Cytb molecular marker. The phylogenetic position of the O. itapeby cluster is only moderately supported in our tree, emerging as a sister clade to O. delator and O. amazonicus ( Figure 4 (A)).

Figures

Figure 4. Genetic relationships of Oxymycterus itapeby based on (A) a maximum likelihood (ML) tree using cytochrome b (mt-Cytb) sequence data considering the HKY +G + I model. Nodal support indices are indicated at the node (ML/BI). Terminal labels include GenBank accession numbers for the sequences downloaded from GenBank or specimen catalogue numbers for those sequences obtained in this study.The sequences of the new specimens from Águas Emendadas Ecological Station (ESECAE) are recovered well nested in the clade of O. itapeby; the holotype (GenBank sequence number MK331135; MHNCI 3595) is indicated with a red line. (B) Phylogenetic TCS parsimony network reconstruction including sequences of O. amazonicus (green dots and line), O. delator (blue dots and line), and O. itapeby (orange dots and line; the red dot is haplotype from holotype, and the violet dot represents haplotypes from the new specimens collected in the ESECAE). Missing haplotypes are indicated by dashes and black circles. The size of the coloured circles is proportional to the number of individuals for each haplotype.