The catfish distributions sticky

For the discussion of catfish systematics. Post here to draw our attention to new publications or to discuss existing works.
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Silurus glanis in Iraq

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Jawad, L. A., Abed, J., Mohsen, Z., & Al-Janabi, M. (2021). A confirmed record of the European catfish Silurus glanis L., 1758 (Actinopterygii: Siluriformes: Siluridae) from the southern marshes of Iraq, with a new anatomical set of characters to separate S. glanis and S. triostegus. Integrative Systematics: Stuttgart Contributions to Natural History, 3(1), 85-100.
Abstract
Investigations conducted in the southern Iraq freshwater systems allowed the authors to collect the European catfish, Silurus glanis L., 1758. These are the first confirmed records of S. glanis from the freshwater systems in Lower Mesopotamia, based on 13 adult specimens, each 325–525 mm in total length. Furthermore, a new set of anatomical characters of S. glanis and S. triostegus from Chibayish marsh area, south of Iraq, was examined to reveal similarities and differences between the two Silurus species. In addition to the traditional separation of the two species of Silurus by number of barbels, these two species can now be recognised based on a new set of morphological and osteological features.
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Re: The catfish distributions sticky

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SILVIA YASMIN LUSTOSA-COSTA, SERGIO BOGAN, LUIZ JARDIM DE QUEIROZ, JUAN I. MONTOYA-BURGOS, ARIEL PARACAMPO, TOMAS MAIZTEGUI, & YAMILA P. CARDOSO. (2021). Distribution extension of Hypostomus uruguayensis (Siluriformes: Loricariidae) in Argentina and first record for Bolivia. Molecular, morphology and biogeography data. Zootaxa, 4996(1): 2 July 2021.

https://DOI.10.11646/ZOOTAXA.4996.1.12
https://mapress.com/zt/article/view/zootaxa.4996.1.12
In recent years, the evolutionary history of the catfish genus Hypostomus has attracted much interest (Cardoso et al. 2021; Jardim de Queiroz et al. 2020; Silva et al. 2016). However, the identification of species of this genus is challenging, given the complex taxonomy of the group and the scarce morphological information available for many taxa. Accurate taxonomic identification is essential to estimate the biodiversity in freshwater environments and the discover of new fish species contributes not only to assess the diversity of regional fauna but also to reconstruct the geomorphological evolution of the river basins, notably in South America. The application of multi-source approaches takes advantage of the complementarity between disciplines to estimate the species diversity, especially among those with an obscure taxonomic status (Dayrat 2005).
Hypostomus constitutes an assemblage of more than 150 species of bottom-dwelling fishes with algivorous or detritivore diets that are widely distributed throughout South America (Fricke et al. 2021). Within the La Plata Basin (which includes the Paraguay, Paraná, Uruguay and Rio de La Plata rivers) the diversity of species of this genus is being revised (Cardoso et al. 2011, 2012, 2016, 2019). However, there are still many studies to be done given problems within the genus, the excessively short original descriptions of many species and the mistaken species identifications, including in scientific collections. Hypostomus uruguayensis (Reis et al. 1990) was originally described from the Uruguay River Basin in Brazil and Uruguay, Reis et al. (1990) distinguishing it from other Hypostomus from the Uruguay River by a very light ground color with darker dots, lower number of lateral plates (26-27) and a strongly concave caudal fin margin. This species was then cited for Argentina (Boltovsky & Cataldo 1999) and its distribution was expanded into the Lower Paraná River (Almiron et al. 2015; Casciotta et al. 2016).
The specimens examined in this work were collected in the Bermejo River in Argentina and in the Pilcomayo River in Bolivia (Figures 1 and 2). Most of the sequences used here are available in GenBank, but two new sequences were added (accession numbers in Figure 1). Tissue sampling, DNA extraction, PCR amplification of D-loop mitochondrial marker and sequencing were following (Cardoso et al. 2011). With a total of 35 sequences, we found the best substitution model and inferred the phylogeny of the genus using the Maximum Likelihood method in Mega v7 (Kumar et al. 2016). Noe support was assessed using 1000 bootstrap replicates. The fish specimens from Argentina were fixed in formalin and then in ethanol 70% and are deposited at the Foundation Felix de Azara (Institution Code: CFA-IC). Morphometrics follow Reis et al. (1990).
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First record of Plotosus canius in Laos

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Hortle, KG & S Phommanivong, 2021. The first record from Laos of Plotosus canius. Ichthyological Exploration of Freshwaters doi:10.23788/IEF-1167.

Abstract

We record the first capture from Laos of the diadromous eel-tail catfish Plotosus canius as a single specimen of total length 1111 mm from Phapheng Channel, which is the most easterly anabranch of the Mekong in the Khone Falls system in southern Laos. The capture location is about 2.5 km downstream of Phapheng Waterfall and about 2.1 km upstream of the Cambodian border with Laos. As the location is about 720 km from the sea and at least 500 km upstream of any possible saline influence, this record shows that some large individuals of this diadromous species, which breeds in brackish waters, may penetrate long distances into freshwaters, where they feed on crabs and molluscs.
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Re: The catfish distributions sticky

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Henschel, E., & Lujan, N. K. (2021). Range extension of the miniature pencil‐catfish Potamoglanis wapixana (Siluriformes: Trichomycteridae) into the Essequibo River basin, Guyana. Journal of Fish Biology.

https://onlinelibrary.wiley.com/doi/abs ... /jfb.14841
Abstract
Morphological examination of Potamoglanis specimens from three localities in the Essequibo River basin, Guyana, and one location in the Branco River basin, Brazil, confirmed their identification as P. wapixana – a species originally described from only the Branco River basin. Morphological similarity of these miniature catfishes on opposite sides of the Rupununi savannah watershed divide and new records from lentic habitat suggest that either their modern populations predate the Pliocene division of the Branco and Essequibo rivers or that the species is capable of living in and/or migrating across the Rupununi Portal – a seasonally flooded hydrological connection known to facilitate movement of mostly much larger fishes between the Branco and Essequibo basins.
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