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Australoheros facetus (Jenyns, 1842) Chromis facetus Jenyns 1842:104. Chromys oblonga Castelnau 1855:14. Heros jenynsii Steindachne 1869:149. Material examined. Table 2, Figure 3F Orbicular, compressed body with 23–27 scales in the longitudinal series. Upper lateral line scales 15–19, lower lateral line scales 7–10. Dorsal fin with 15–16 spines and 9–12 soft rays. Anal fin with 5–7 spines and 7–10 soft rays. Dorsal and anal fin bases covered by scales. A midlateral blotch of variable size, 6 vertical flank bars and the caudal fin blotch make up the principal coloration markings. A very short-caudal peduncle where the vertical bar many often mixes with the caudal spot., Published as part of Bertora, Andrea, Grosman, Fabián, Sanzano, Pablo & Rosso, Juan J., 2018, Fish fauna from the Langueyú basin, Argentina: a prairie stream in a heavily modified landscape, pp. 461-470 in Check List 14 (2) on page 466, DOI: 10.15560/14.2.461, {"references":["Jenyns L (1842) Fish. In: Darwin C (Ed) The zoology of the voyage of H. M. S. Beagle, under the command of Captain Fitzroy, R. N., during the years 1832 to 1836. Part 4. Smith, Elder and Co., London, 172 pp. https: // doi. org / 10.5962 / bhl. title. 14216"]}

Cheirodon interruptus (Jenyns, 1842) Tetragonopterus interruptus Jenyns 1842: 127. Chirodon monodon Cope 1894: 91. Cheirodon meinkeni Ahl 1928: 320. Cheirodon leuciscus Ahl 1936: 19. Hyphessobrycon nigrifrons Ahl 1936: 23. Pedalibrycon felipponei Fowler 1943: 314. Material examined. Table 2, Figure 3C One row of 5 teeth on premaxilla and 1 tooth in the maxilla. Pseudotympanum present. Lateral line incomplete with 5– 8 perforated scales. Ventral procurrentrays 22–29, more notorious in males. Caudal-fin rays 14–17. A conspicuous dark rhombus mark in the peduncle. Pelvic fin with 6 branched rays., Published as part of Bertora, Andrea, Grosman, Fabián, Sanzano, Pablo & Rosso, Juan J., 2018, Fish fauna from the Langueyú basin, Argentina: a prairie stream in a heavily modified landscape, pp. 461-470 in Check List 14 (2) on page 465, DOI: 10.15560/14.2.461, {"references":["Jenyns L (1842) Fish. In: Darwin C (Ed) The zoology of the voyage of H. M. S. Beagle, under the command of Captain Fitzroy, R. N., during the years 1832 to 1836. Part 4. Smith, Elder and Co., London, 172 pp. https: // doi. org / 10.5962 / bhl. title. 14216"]}

Jenynsia multidentata (Jenyns, 1842) Lebias multidentata Jenyns 1842: 117. Poecilia punctata Valenciennes in Cuvier and Valenciennes 1846: 133. Xiphophorus heckelii Weyenbergh 1874: 292. Material examined. Table 2, Figure 3H Small, subcilindrical body. A large central scale on the dorsal surface of head. Predorsal series with 13 or 14 scales. Lateral lines series with 30–32 scales. A tubular gonopodium formed by modified anal-fin rays in males. A swelling between the urogenital papilla and the origin of anal fin in females. Anal fin with 13 or 14 rays. Color pattern: dash-shaped spots arranged in longitudinal lines, with 4 or 5 lines on caudal peduncle., Published as part of Bertora, Andrea, Grosman, Fabián, Sanzano, Pablo & Rosso, Juan J., 2018, Fish fauna from the Langueyú basin, Argentina: a prairie stream in a heavily modified landscape, pp. 461-470 in Check List 14 (2) on page 466, DOI: 10.15560/14.2.461, {"references":["Jenyns L (1842) Fish. In: Darwin C (Ed) The zoology of the voyage of H. M. S. Beagle, under the command of Captain Fitzroy, R. N., during the years 1832 to 1836. Part 4. Smith, Elder and Co., London, 172 pp. https: // doi. org / 10.5962 / bhl. title. 14216"]}

Synbranchus marmoratus Bloch, 1795 Synbranchus immaculatus Bloch 1795: 87. Synbranchus marmoratus Bloch 1795: 87. Typhlobranchus spurius Bloch and Schneider 1801: 537. Unibranchapertura lineata Lacepède 1803: 656, 658. Synbranchus pardalis Valenciennes 1836: pl. 13. Synbranchus fuliginosus Ranzani 1839: 75. Synbranchus vittatus Castelnau 1855: 84. Symbranchus hieronymi Weyenbergh 1877: 14. Symbranchus doeringii Weyenbergh 1877: 15. Symbranchus tigrinus Weyenbergh 1877: 16. Synbranchus mercedarius Weyenbergh 1877: 22. Falconeria aptera Larrañaga 1923: 381. Falconeria pinnata Larrañaga 1923: 381. Material examined. Table 2, Figure 3O Long body very often reaching 1 m SL, lacking scales. Sole branchial opening in ventral midline. Upper lip and the nuchal hump well developed. Lack of pectoral and pelvic fins. Black or dark brown roundish blotches scattered homogeneously along body with marbled pattern., Published as part of Bertora, Andrea, Grosman, Fabián, Sanzano, Pablo & Rosso, Juan J., 2018, Fish fauna from the Langueyú basin, Argentina: a prairie stream in a heavily modified landscape, pp. 461-470 in Check List 14 (2) on page 467, DOI: 10.15560/14.2.461, {"references":["Bloch ME (1795) Naturgeschichte der auslandischen Fische. Berlin, Auf Kosten des Verfassers und in Commission bei dem Buchhandler Hr. Hesse: 1 - 192, pls 397 - 429. https: // doi. org / 10.5962 / bhl. title. 63303","Valenciennes A (1836) Poissons. In: d'Orbigny A (Ed) Voyage dans l'Amerique meridionale: (le Bresil, la republique orientale de l'Uruguay, la Republique argentine, la Patagonie, la republique du Chili, la republique de Bolivia, la republique du Perou), execute pendant les annees 1826, 1827, 1828, 1829, 1830, 1831, 1832, et 1833. Bertrand et Levrault, Paris, pls. 1 - 16."]}

Oligosarcus jenynsii (Günther, 1864) Xiphorhamphus jenynsii Günther 1864: 356. Xiphorhamphus brachycephalus Cope 1894: 84. Sphyraenocharax brachycephalus Fowler 1906: 84. Acestrorhamphus jenynsii Eigenamnn and Ogle 1907: 35. Acestrorhamphus brachycephalus Eigenamnn 1907: 452. Acestrorhynchus jenynsii Devincenzi 1924: 178. Acestrorhamphus purpureus Messner 1962: 1. Material examined. Table 2, Figure 3D A large, oblique head. Orbital diameter 25–34% of the head length. Upper jaw slightly larger than lower jaw when the mouth is closed. Both jaws with canine teeth. Maxilla with 19–28 teeth. Large (may reach 220 mm SL) compressed body with 54–65 scales in the lateral line system. Ten to 13 scales from lateral line origin to dorsal fin. Anal-fin rays 26–30. Scale around lateral peduncle 21–25., Published as part of Bertora, Andrea, Grosman, Fabián, Sanzano, Pablo & Rosso, Juan J., 2018, Fish fauna from the Langueyú basin, Argentina: a prairie stream in a heavily modified landscape, pp. 461-470 in Check List 14 (2) on page 465, DOI: 10.15560/14.2.461, {"references":["Gunther A (1864) Catalogue of the fishes in the British Museum. Catalogue of the Physostomi, containing the families Siluridae, Characinidae, Haplochitonidae, Sternoptychidae, Scopelidae, Stomiatidae in the collection of the British Museum 5: 1 - 455."]}

Pimelodella laticeps Eigenmann, 1917 Pimelodella laticeps Eigenmann 1917: 243. Material examined. Table 2, Figure 3K Naked, low and long body. Maxillary barbels reaching the posterior most tip of dorsal fin. Mental barbels reaching the pectoral-fin base. Adipose fin short, 3.3–4 times in SL. Pectoral fin with anterior and posterior margins serrated. Caudal-fin lobes equals in size. Color pattern: a dark grey background with a midlateral darker band., Published as part of Bertora, Andrea, Grosman, Fabián, Sanzano, Pablo & Rosso, Juan J., 2018, Fish fauna from the Langueyú basin, Argentina: a prairie stream in a heavily modified landscape, pp. 461-470 in Check List 14 (2) on page 467, DOI: 10.15560/14.2.461, {"references":["Eigenmann CH (1917) Pimelodella and Typhlobagrus. Memoirs of the Carnegie Museum 7 (4): 229 - 258, pls. 29 - 35."]}

On the Pampa plain, one of the most productive modified areas of Argentina, important changes in land uses have drastically altered the landscape during the last decades. This has led to an increased deterioration of surface waters affecting fish that inhabit them. We provide a list of fish species inhabiting an unsurveyed prairie stream of this region. Environmental variables were measured and fish samplings were conducted in 3 sites of the Langueyú stream. A total of 15 species belonging to 10 families and 6 orders were collected. Characiformes and Siluriformes were the richest orders. Characidae was the most representative family. Species richness was highest when compared with other similar regional environments without connection with the Salado river basin. Most of the fish species collected are typical of the region but others are species which typically do not progress beyond the Salado river basin. The role of human intervention in fish species distribution is discussed.

Corydoras paleatus (Jenyns, 1842) Callichthys paleatus Jenyns 1842: 113. Corydoras marmoratus Steindachner 1879: 26. Corydoras maculates Steindachner 1879: 32. Silurus quadricostatus Larrañaga 1923: 376. Silurus septemradiatus Larrañaga 1923: 385. Material examined. Table 2, Figure 3J Small, deep body. Head compressed, triangular in dorsal view. Maxillary barbels moderate in size, not reaching gill opening. Outer mental barbels slightly longer than maxillary barbels. Body covered by 2 series of plates. Dorsal series with 23–25 plates. Ventral series with 20–22 plates. Serrae along the entire posterior margin of the pectoral spine perpendicularly oriented. A longitudinal series of 3 large black blotches along midline of flank. Ventral surface yellowish., Published as part of Bertora, Andrea, Grosman, Fabián, Sanzano, Pablo & Rosso, Juan J., 2018, Fish fauna from the Langueyú basin, Argentina: a prairie stream in a heavily modified landscape, pp. 461-470 in Check List 14 (2) on page 467, DOI: 10.15560/14.2.461, {"references":["Jenyns L (1842) Fish. In: Darwin C (Ed) The zoology of the voyage of H. M. S. Beagle, under the command of Captain Fitzroy, R. N., during the years 1832 to 1836. Part 4. Smith, Elder and Co., London, 172 pp. https: // doi. org / 10.5962 / bhl. title. 14216"]}

La estructura y el funcionamiento de las lagunas pampeanas pueden explicarse por su geomorfología, régimen climático, drenajes ubicados en suelos naturalmente ricos en nutrientes y por las modificaciones humanas en el uso de la tierra y el agua. Es posible caracterizarlas sintéticamente como lagos de llanura, someros, polimícticos, eutróficos o hipertróficos, y con tiempo de permanencia del agua y salinidad altamente variables. Estas características explicarían la elevada biomasa de sus comunidades bióticas. Un análisis sincrónico, durante el pico de la estación de crecimiento, nos permitió discriminar tres tipos dentro de las grandes lagunas de carácter permanente: lagunas con biomasa del fitoplancton relativamente baja y abundante desarrollo de las macrófitas acuáticas, lagunas con abundante desarrollo del fitoplancton pero escaso desarrollo de la macrofitia, y lagunas con alta turbidez inorgánica y escaso desarrollo de la macrofitia y del fitoplancton. El primer tipo coincide con lo que comúnmente se conoce como lagunas “claras”, de aguas relativamente transparentes y alta abundancia relativa de peces piscívoros de alto porte. El segundo coincide con lagunas verdes y “turbias”, y que generalmente presentan altas abundancias de peces planctívoros. El tercer tipo sería resultado de la acción humana directa sobre el espejo de agua o su cuenca de drenaje. La abundancia relativa de lagunas turbias es mayor en las zonas con mayor intensidad de uso de la tierra. Sin embargo, la alta variabilidad anual e interanual del paisaje pampeano se ve reflejada en el funcionamiento del ecosistema lacunar. Gran parte de las lagunas pasa por una fase estacional de aguas claras caracterizada por una alta abundancia de los cladóceros de gran tamaño, que finaliza cuando alcanza su pico de abundancia la clase 0+ de planctívoros. La compleja interacción de factores climáticos y de uso de la tierra explicaría la ocurrencia de cambios no periódicos en la tipología de una determinada laguna, fenómeno que se intensifica a medida que las lagunas disminuyen de tamaño. The structure and function of the Pampa plain lakes are explained, in large part, by its history, geomorphology, climate, nutrient rich soils drainages, and by the modifications produced by man in his use of land and water. They can be synthetically characterized as plain lakes, very shallow, polimyctic, eutrophic or hypertrophic, and with water renewal time and salinity highly fluctuating. This conjunction of external characteristics explains the high biomass of each one of its biotic communities. A synchronous analysis, during the peak of the growth season, permits us to discriminate three types within the large lakes of permanent character: lakes with relatively low phytoplankton biomass and abundant development of the rooted macrophyte, lakes with abundant development of the phytoplankton but scarce macrophyte development, and lakes with high inorganic turbidity, scarce aquatic macrophyte abundance, and low phytoplankton biomass. The first type coincides with what usually is known as “clear” lakes, of relatively transparent waters and high relative abundance of large piscivorous fishes. The second coincides with green, “turbid” lakes, of low water transparency, and usually with high abundance of visual planktivorous fishes. An increased relative abundance of filter feeding planktivores is noticeable in lakes impacted by organic waste discharges. The third type encompasses lakes clearly limited in their productivity by light availability, and would be the result of direct human action on their drainage basins. The relative abundance of turbid lakes is generally greater in zones with higher intensity of land use. However, the high annual and year-to-year variability of the Pampean landscape is seen reflected in the operation of the lake ecosystem. Large part of the lakes goes through a seasonal phase of clear waters characterized by a high abundance of cladocerans of greater size that ends when reaches its peak of abundance the class 0+ of planktivores. The complex interaction between climatic factors and land use also would explain the non-periodic changes in the typology of a given lake. For permanent lakes, this phenomenon would be intensified with a decrease in lake surface area.