Systematics of Brucepattersonius Hershkovitz, 1998 (Rodentia, Sigmodontinae): molecular species delimitation and morphological analyses suggest an overestimation in species diversity

Edson Fiedler Abreu, Diego Marques Henriques Jung, Alexandre Uarth Christoff, Victor Hugo Valiati, Sharon A. Jansa, Alexandre Reis Percequillo

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

The genus Brucepattersonius currently includes eight valid species from the Atlantic Forest of south-eastern Brazil and north-eastern Argentina. Most of those species were described in the past 20 years, based on very small sample sizes: four species are known only from their type localities. Concerns on the taxonomic validity of some Brucepattersonius species have been raised in the recent literature. In this study, we present a phylogenetic hypothesis including samples throughout the distribution of the genus (among them the holotypes of two species) and employed single-locus molecular species delimitation analyses to provide a new hypothesis for species limits within Brucepattersonius. We also analysed intra- and interpopulation morphological and morphometric variation to apply an integrative taxonomic approach to species delimitation. Our phylogenetic inference of molecular data recovered four strongly supported clades within Brucepattersonius, which were recognized as distinct operational taxonomic units in all species delimitation analyses. The first two clades represent the Caparaó mountain range endemic B. griserufescens and its sister-group, the recently described species B. nebulosus. The third clade comprises several specimens assigned to B. soricinus but also includes the holotype of B. igniventris; we revise these species limits accordingly. The last clade is composed of samples from southern Brazil assigned to B. iheringi. Based on morphological and morphometric analyses, we find no clear structure among the three described species from Misiones Province, Argentina (B. guarani, B. misionensis and B. paradisus) and B. inheringi from southern Brazil, suggesting that those samples represent a single species. Therefore, in the present study we propose that the genus Brucepattersonius comprises only four diagnosable species: B. griserufescens (including B. albinasus), B. nebulosus, B. soricinus (including B. igniventris) and B. iheringi (including B. guarani, B. misionensis and B. paradisus).

Original languageEnglish (US)
Pages (from-to)544-570
Number of pages27
JournalSystematics and Biodiversity
Volume19
Issue number6
DOIs
StatePublished - Apr 1 2021

Bibliographical note

Funding Information:
This study was supported by the Fundação de Amparo à Pesquisa do Estado de Sào Paulo (FAPESP) under grants 2010/14633-7 and 2012/15928-6 to EFA, and 2009/16009-1 and 2016/20055-2 to ARP; Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES); and Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) under grants 165553/2017-0 to EFA, 308996/2017-8 to VHV, and 304156/2019-1 to ARP. We thank curators and staff of scientific collections listed in the topic ‘Sampling’ for allowing us to examine specimens under their care. We are indebted to James L. Patton, Yuri L.R. Leite, and Dayse Dias for kindly providing valuable CYTB sequences. We are also deeply indebted to Rubén Barquez, who provided information and photographs of type specimens housed at the Colección Mamíferos Lillo (CML). We also thank to Ricardo Bovendorp and Ricardo Roth for allowing us to use their photographs of B. soricinus and B. iheringi, respectively. Finally, we are grateful to Don E. Wilson who generously reviewed an early version this manuscript, and two anonymous referees for providing important suggestions that certainly helped to improve this manuscript.

Publisher Copyright:
© The Trustees of the Natural History Museum, London 2021. All Rights Reserved.

Keywords

  • Atlantic Forest
  • morphology
  • morphometry
  • phylogeny
  • rodents
  • species limits
  • synonym
  • taxonomic inflation

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