Pimelodella guato, a new species is described from rio Paraguai basin in Mato Grosso do Sul and Mato Grosso States, Brazil. This new species can be diagnosed from all congeners by several exclusive characteristics, not least the long maxillary barbels reaching at least the anal-fin terminus.
Open-access – https://www.scielo.br/j/ni/a/jKj7yDJKFMPnD7CsJSjvvbw/
“This study also discusses the ichthyofaunal similarities between the Paraguai and Amazon basins, shedding light on their biogeographic history. Additionally, the research includes considerations about the sexual dimorphism of Pimelodella and provides an identification key for the Pimelodella species found in the Paraguai basin.”
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A new species of Pimelodella (Siluriformes: Heptapteridae) from the Paraguai basin, Brazil, with a discussion regarding its distribution
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Pierre, V., & Slobodian, V.. (2024). A new species of Pimelodella (Siluriformes: Heptapteridae) from the Paraguai basin, Brazil, with a discussion regarding its distribution. Neotropical Ichthyology, 22(1), e230110. https://doi.org/10.1590/1982-0224-2023-0110
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A new species of Pimelodella is described from the rio Paraguai basin in Mato Grosso do Sul and Mato Grosso States, Brazil. The new species distinguishes from all other members of the genus based on a unique combination of characteristics, which include: dorsal profile straight from snout to dorsal-fin, maxillary barbel reaching at least the anal-fin terminus when parallel to main body axis, robust dorsal-fin spine bearing small spinules along three-fourths of its posterior margin, 41โ42 total vertebrae (rarely 43 or 44), 13โ23 large and retrorse blades at the posterior margin of the pectoral-fin spine, and dorsolateral region of body slightly darkened.
This study also discusses the ichthyofaunal similarities between the Paraguai and Amazon basins, shedding light on their biogeographic history. Additionally, the research includes considerations about the sexual dimorphism of Pimelodella and provides an identification key for the Pimelodella species found in the Paraguai basin.
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The species name guato is in honour of the indigenous Guatรณ people, who are affectionately known as โpeople of the Pantanal watersโ due to their primary mode of transportation, canoes. Historically, the Guatรณ people inhabited an extensive area along the rio Paraguai (Schmidt, 1942).
However, in the 1940s, they began to lose their territory due to cattle ranching, and many relocated to cities such as Cรกceres and Corumbรก. This dispersal led to a reduction in the Guatรณ population, and since then, they have been fighting for recognition of their ethnicity and the demarcation of their lands (Costa, 2015).
The choice of guato is a homage to the resilience and cultural significance of these people who inhabit the same region where the new species is found. It also recognizes the ongoing struggles with land delimitation that indigenous communities continue to face, particularly in Brazil. A noun in apposition.
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Pimelodella guato, holotype, ZUFMS-PIS 8515, 78.5 mm SL, Brazil, Mato Grosso do Sul, Corumbรก municipality, rio Paraguai basin, rio Miranda, sandy beaches at Passo do Lontra region, 19ยฐ34โ37โS 57ยฐ00โ42โW. A. Dorsal; B. Left lateral; and C. Ventral views. Scale bar = 1 cm.
Copyright ยฉ 2024 the Author(s). Published in Neotropical Ichthyology journal. This paper is released under a Creative Commons Attribution 4.0 International (CC BY 4.0) licence. https://creativecommons.org/licenses/by/4.0/
