Browsing by Autor "H. Torrico-Destre"

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    A New Species of Propimelodus (Pimelodidae) from the Upper Madeira System, Amazon Basin
    (Pleiades Publishing, 2025) H. Torrico-Destre; M. Careaga; Fernando M. Carvajal‐Vallejos
    A new species of pimelodid catfish of the genus Propimelodus, diagnosed in this group by a long adipose fin and shorter spines on dorsal and pectoral fins, from the upper Madeira system in Bolivia is described. Propimelodus lobatus sp. nov. is distinguished from its congeners by the eye diameter (P. lobatus 20.6–24.8% of head length, 45.3–56% of snout length and 114–153.1% of posterior nostril–eye distance vs. 29.7–34.8% of head length and 62.7–74.7% of snout length in P. araguayae, 30.7–44.1% of snout length and 70.4–114% of posterior nostril–eye distance in P. caesius, and 9.6–19.8% of head length, 17.2–37.9% of snout length and 36–90% of posterior nostril-eye distance in P. eigenmanni), total number of gills rakers on first branchial arch (P. lobatus 30–34 vs. 20–23 in P. caesius and 19–20 in P. eigenmanni), anal fin lobe present in P. lobatus (vs. absent in P. caesius and P. eigenmanni), total number of vertebrae (P. lobatus 42–44 vs. 46–48 in P. caesius and 45–46 in P. eigenmanni). This species may potentially be distributed throughout the Madeira River, other parts of the Amazon basin, and the Orinoco basin.
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    Bolivian Freshwater Stingrays (Potamotrygonidae): Species Characterization and Taxonomic Knowledge Update
    (Pleiades Publishing, 2025) H. Torrico-Destre; M. Careaga; Fernando M. Carvajal‐Vallejos
    The aim of this study was to characterize the species of stingrays present in Bolivia and to update the species list. Forty–four specimens were examined, and 32 linear measurements were taken on each individual. Specimens examined are deposited in the Ichthyological Collection Universidad Mayor de San Simón–Museo d’Orbigny, Cochabamba, Bolivia. Eight species and two genera Paratrygon and Potamotrygon were identified. The Amazon Basin comprises seven species and La Plata Basin four. The sub–basins with the highest species diversity were Mamoré and Iténez. The species with the widest distribution was P. motoro. Some species, such as P. amandae, P. motoro and P. pantanensis share certain diagnostic morphological characters, making their identification difficult. A dichotomous artificial key for species identification is provided. This study reveals an increase in the number of stingrays species previously documented in Bolivia.