Reappraisal of the systematics of Microglanis cottoides (Siluriformes, Pseudopimelodidae), a catfish from southern Brazil

Abstract

The southern region of Brazil is characterized by high species diversity and endemism of freshwater fishes distributed across geographically isolated river basins. Microglanis cottoides has a widespread range across these river basins and occurs in sympatry with other endemic species of the genus (e.g. M. cibelae, M. eurystoma, and M. malabarbai). Herein we tested the monophyly of M. cottoides and presented for the first time information about the molecular phylogeny of species in the genus. The results suggest that M. cottoides currently forms a non-monophyletic group which includes populations endemic to the Uruguay River basin that are more closely related to M. malabarbai, and excludes M. cibelae, found to be nested within M. cottoides. Based on an integrative approach using morphological and molecular data, we propose M. cibelae as a junior synonym of M. cottoides, and the populations of the Uruguay River basin previously assigned to M. cottoides in fact belong to M. malabarbai. Our molecular phylogeny shows that M. cottoides is sister to M. parahybae, which is also a coastal species, and M. malabarbai is sister of M. garavelloi, both endemic to inland river basins. The time-calibrated phylogeny indicates that the separation between inland and the coastal clades occurred in the Tertiary period, and that the species within the coastal basins diverged in the Pliocene, which overlaps with the diversification times estimated for the two inland species as well. This pattern of diversification corroborates some previous studies with other fishes from the same region.

Lista De Especies De Peces De La Cuenca Del Río Queguay, Río Uruguay Bajo

“…Hoplias argentinensis fue recientemente descrita en base a ejemplares previamente asignados a Hoplias malabaricus (Rosso et al, 2018); Megaleporinus obtusidens fue transferida desde Leporinus obtusidens por Ramirez et al (2017); Corydoras longipinnis fue descrita en base a ejemplares previamente considerados como C. paleatus (Knaak, 2007). En base a una revisión del género, Souza-Shibatta et al (2018) consideraron que los individuos de Microglanis de la cuenca del Río Uruguay previamente asignados a M. cottoides deben ser considerados como Microglanis cf. malabarbai.…”

“…En el caso de tres especies, el registro corresponde solamente a una fotografía tomada in situ por pescadores locales la cual se encuentra en el repositorio electrónico de la colección de peces de la Facultad de Ciencias (ZVC-PF). La identificación taxonómica de los ejemplares se realizó en base a Ghazzi (2008), Rodríguez & Miquelarena (2008), de Lucena et al (2013, Serra et al (2014), Almirón et al (2015), Loureiro et al (2016), Tencatt et al (2016), Rosso et al (2018), Serra & Loureiro (2018), Souza-Shibatta et al (2018) y Turcati et al (2018). Además, se sumaron al listado las especies mencionadas por Litovsky & Urruty (2013), cuya identificación consideramos no ambigua (Tabla 1).…”

Phylogenomics of the bumblebee catfishes (Siluriformes: Pseudopimelodidae) using ultraconserved elements

“…Some species of Batrochoglanis and Microglanis are popular in the aquarium trade (Shibatta, 2003) and Lophiosilurus , a Rio São Francisco endemic, is used in aquaculture (Costa et al, 2015; Sato et al, 2003). In addition, pseudopimelodids have been in the subjects of various studies on development (Guimarães‐Cruz et al, 2009), cytogenetics (Gouveia et al, 2018; Martinez et al, 2004), mitogenomics (Carvalho et al, 2016), internal anatomy (Abrahão et al, 2018, 2021; Abrahão & Shibatta, 2015; Birindelli & Shibatta, 2011), and biogeography (Rangel‐Medrano et al, 2020; Souza‐Shibatta et al, 2018).…”

Iterative taxonomic study of Pareiorhaphis hystrix (Siluriformes, Loricariidae) suggests a single, yet phenotypically variable, species in south Brazil

“…The geographic distribution of such variation has not been investigated, and it is thus not clear whether these represent intraspecific variation or could indicate the presence of multiple species. The combination of phenotypical data with molecular markers in an iterative approach, as opposed to the traditionally used morphology or molecules alone, has been efficient in fish population studies, and their use can contribute to the identification of cryptic species [9,10].…”