Species delimitation based on integrative approach suggests reallocation of genus in Hypostomini catfish (Siluriformes, Loricariidae)
Abstract
Integrative approaches are particularly useful to resolve taxonomic uncertainties in species-rich groups that have undergone explosive radiation, such as Hypostomini (suckermouth armored catfishes). This tribe encompasses the genera Hypostomus and Pterygoplichthys, but the actual number of species in each genus and the intergeneric interrelationships are confusing or unknown for some ecoregions in the Neotropics. Here, we analyzed three endemic species Hypostomus chrysostiktos, H. jaguar and H. unae from Northeastern Mata Atlântica in northeastern Brazil based on meristic characters, geometric morphometrics, chromosomal data, DNA barcode and species delimitation algorithms. The current taxonomic status of these catfishes is challenged. While H. unae and H. jaguar revealed a close evolutionary relationship similar to those observed within Hypostomus from other basins, H. chrysostiktos was herein more closely related to Pterygoplichthys, being invariably recovered as a highly distinctive taxonomic unit than to Hypostomus. Therefore, we recommend the reallocation of H. chrysostiktos as Pterygoplichthys chrysostiktos and a thorough systematic review of Pterygoplichthys, particularly focusing on putative convergence traits in relation to Hypostomus.
Keywords
Cytogenetics DNA barcode Geometric morphometrics Hypostomus PterygoplichthysNotes
Acknowledgements
The financial support to this work was provided by Fundação de Amparo à Pesquisa do Estado da Bahia (FAPESB) (Grant RED0009/2013). The license to collect the specimens (Number 26752-3) was obtained from the Instituto Chico Mendes de Conservação da Biodiversidade/Sistema de Autorização e Informação da Biodiversidade (ICMBio/SISBIO). The euthanasia and experiments were approved by the Ethic Committee of Utilization of Animals from Universidade Estadual do Sudoeste da Bahia (CEUA/UESB, Number 32/2013). The authors would also like to thank the field assistants, particularly the fishermen from Iaçu-BA.
Supplementary material
References
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