Phylogenetic Relationships of Oryzomine Rodents (Muroidea: Sigmodontinae): Separate and Combined Analyses of Morphological and Molecular Data

  title={Phylogenetic Relationships of Oryzomine Rodents (Muroidea: Sigmodontinae): Separate and Combined Analyses of Morphological and Molecular Data},
  author={Marcelo Weksler},
Abstract In this study I provide a phylogenetic hypothesis for the tribe Oryzomyini that can be used to understand the diversification and evolution of this group of rodents and to revise the current generic-level classification. Morphological and molecular data were used for these purposes in combined and separate analyses. Molecular data consisted of partial sequences (1266 bp) from the first exon of the nuclear gene encoding the interphotoreceptor retinoid binding protein (IRBP); the… 

Tempo and mode of evolution of oryzomyine rodents (Rodentia, Cricetidae, Sigmodontinae): A phylogenomic approach ☆ Molecular Phylogenetics and Evolution

A genome-wide phylogenetic hypothesis for Oryzomyini is provided and all genera confirmed as monophyletic, a result that previous studies failed to obtain, and monophyly and phylogenetic relationship of three main clades of the tribe are corroborated.

First phylogenetic analysis of the tribe Phyllotini (Rodentia: Sigmodontinae) combining morphological and molecular data

This is the first combined phylogenetic analysis (morphological and molecular) of phyllotines, which includes the widest taxon and character sampling to date, and retrieved Phyllotini as a monophyletic clade with a composition that matches that obtained in most other recent analyses.

Diversification and species limits in two genera of the tribe Oryzomyini (Rodentia: Cricetidae: Sigmodontinae) revealed by combined molecular and cytogenetic approaches

The results revealed that cytogenetics is important in the recognition of all described species (cytotaxonomy), and that Cerradomys is a recent genus, with speciation events occurred mainly in the Pleistocene.

Phylogeny of the tribe Abrotrichini (Cricetidae, Sigmodontinae): integrating morphological and molecular evidence into a new classification

It is hypothesize that Abrotrichini originated in south‐western South America by vicariance and then diversified mostly by successive dispersal events, and is named here as subtribes.

Molecular divergence within the Oryzomys palustris complex: evidence for multiple species

The phylogenetic and genetic divergence data imply that consideration should be given to recognizing 4 additional species in this complex of Oryzomys palustris and O. couesi.

How many marmoset (Primates: Cebidae: Callitrichinae) genera are there? A phylogenetic analysis based on multiple morphological systems

  • G. Garbino
  • Biology
    Cladistics : the international journal of the Willi Hennig Society
  • 2015
This is the first morphological study to support an Amazonian marmoset clade (Cebuella + Mico), which is also strongly supported in exclusively molecular phylogenies, and to synonimize Callibella under Mico.

A newly recognized clade of trans-Andean Oryzomyini (Rodentia: Cricetidae), with description of a new genus

H aphrastus is best regarded as representing a new genus, which is described and named herein and forms a monophyletic group of mainly southern Central American and northern South American taxa primarily restricted to lowland to midelevation montane trans-Andean habitats and possessing a marked ability to cross expanses of salt water.

A review of Euryoryzomys legatus (Rodentia, Sigmodontinae): morphological redescription, cytogenetics, and molecular phylogeny

The authors' integrated analyses reinforce E. legatus as a full species, but highlight that E. macconnelli, E. emmonsae, and E. nitidus each may be a species complex and worthy of systematic attention.

The phylogenetic relationships of the Andean swamp rat genus Neotomys (Rodentia, Cricetidae, Sigmodontinae) based on mitochondrial and nuclear markers

The genus Neotomys is found closely related to the genera Euneomys and Irenomys, which are distributed around the Central and Southern Andes in South America evidencing that the Andes have played an important role in the diversification of several tribes of sigmodontine rodents.



Phylogeny of Neotropical oryzomyine rodents (Muridae: Sigmodontinae) based on the nuclear IRBP exon.

  • M. Weksler
  • Biology
    Molecular phylogenetics and evolution
  • 2003


A combined (simultaneous) maximum-parsimony analysis of both datasets (nonmolecular + IRBP) produced a consensus topology that closely resembled the results of analyzing IRBP separately, and a new genus is described for “Marmosa” canescens.

The diversification of South American murid rodents: evidence from mitochondrial DNA sequence data for the akodontine tribe

Phylogenetic relationships based on 801 base pairs of the mitochondrial cytochrome b gene are examined for eight genera and 28 species of the akodontine tribe of South American murid rodents, finding divergence among genera within the tribe reaches 35% in corrected estimates, a level that is as great as that among representatives of different tribes.

Systematics of Oligoryzomys: Protein-Electrophoretic Analyses

The oryzomyines are a speciose tribe of Neotropical muroid rodents within which morphological comparisons have so far failed to produce well-resolved phylogenies and are found to form a monophyletic group, although hierarchical relationships among them were not evident.


Phylogenetic relationships of 6 species of the genus Akodon have been determined by mtDNA sequence analysis of the cytochrome-b gene, with the majority of specimens also identified by karyotype, and populations showed high variation with little geographic pattern.

Molecular phylogeny of the genus Oryzomys (Rodentia: Sigmodontinae) based on cytochrome b DNA sequences.

The monophyly of three Oryzomys species groups was tested, by distance, parsimony, and maximum-likelihood (ML), and 801 bp of the mitochondrial gene cytochrome b was analyzed; the results did not sustain the monophyle of OryZomys nor of the nitidus and subflavus species groups.

Systematic studies of Oryzomyine rodents (Muridae, Sigmodontinae): diagnoses and distributions of species formerly assigned to Oryzomys 'capito'

This study considers Fischer’s (1814) Mus megacephalus to be valid and available, designate a neotype to bear the name, and reinstate it as a senior synonym of capito Olfers (1818).

Phylogenetic relationships among the phyllotini (rodentia: Sigmodontinae) using morphological characters

  • S. Steppan
  • Biology
    Journal of Mammalian Evolution
  • 2005
Thirty-three species representing all 14 genera of the South American rodent tribe Phyllotini and 5 problematic genera are surveyed for multistate and binary dental, cranial, skeletal, external, and male reproductive tract characters and the taxonomic consequences of the phylogeny are presented.

A new species of Oryzomys (Rodentia, Sigmodontinae) of the subflavus group from the Cerrado of Central Brazil

A new Oryzomys species was described on the basis of 31 specimens obtained in the Cerrado of central Brazil that possesses a tail that is longer than head and body, a soft and long pelage, and a dresden brown dorsum lined with black.

A new karyological variant of Oecomys (Rodentia: Sigmodontinae) and its phylogenetic relationship based on molecular data.

A new karyological variant of the Sigmodontinae genus Oecomys was detected in specimens from Brazilian Pantanal, and molecular analysis using cytochrome-b sequence data suggested the monophyly of OEComys.