153. Pseudobiotus megalonyx (Thulin, 1928) sensu lato [F]

Hypsibius (subgen. Isohypsibius Thulin 1928) augusti (J. Murray 1907) forma megalonyx Thulin 1928 (Marcus 1939) H. (I.) augusti (J. Murray, 1907), forma typica (du Bois-Reymond Marcus 1944) Hypsibius augusti (Murray) (Van der Land 1970)

Pseudobiotus augusti (J. Murray) (Claps 1984)

Pseudobiotus augusti (Murray, 1907) (Claps & Rossi 1988, Rossi and Claps 1991) Pseudobiotus augusti (Murray, 1907) (Rossi & Claps 1991)

Terra typica: Sweden (Europe)

Argentina:

• 29°11′S, 58°04′W; 100 m asl: Corrientes Province, near Mercedes, cerro Pajarito, laguna, algae ( Chara sp.). Claps & Rossi (1988), Rossi & Claps (1991)

• 31°39′S, 64°59′W; 1,050 m asl: Córdoba Province, Toro Muerto, sample on plant ( Potamogeton af. berteroanus). Rossi & Claps (1991)

• 33°37′S, 60°15′W; 50 m asl: Buenos Aires Province, Arroyo Manantiales, benthos samples. Rossi & Claps (1991)

• 33°56′S, 59°21′W; 0 m asl: Buenos Aires Province, Rio Areco, plankton samples. Rossi & Claps (1991)

• 33°57′S, 59°43′W; 0 m asl: Buenos Aires Province, Arroyo Burgos, benthos, plankton samples and on plant ( Hydrocotyle ranunculoides L.). Rossi & Claps (1991)

• 34°33′S, 59°07′W; 0 m asl: Buenos Aires Province, Rio Luján, on plant ( Alternanthera philoxeroides (Martius) Grisebach). Rossi & Claps (1991)

• 34°53′S, 57°59′W; 0 m asl: Buenos Aires Province, Arroyo del Gato [Arroyo el Gato], benthos samples. Rossi & Claps (1991)

• 34°54′S, 57°56′W; 0 m asl: Buenos Aires Province, La Plata, Jardín Zoológico de la Plata, lentic microlimnotopes, on plant ( Nymphaea sp.). Rossi & Claps (1991)

• 34°56′S, 58°04′W; 0 m asl: Buenos Aires Province, Arroyo Rodríguez, plankton sample. Rossi & Claps (1991)

• 35°01′S, 57 ° 31′W; 0 m asl: Buenos Aires Province, Punta Atalaya, Rio de la Plata, zooperiphyton on plant ( Scirpus (Schoenoplectus) californicus (Meyer) Steud.). Claps (1984)

• 38°08′S, 61°48′W; 250 m asl: Buenos Aires Province, arroyo in Sierra de la Ventana, stones in the water. Rossi & Claps (1991)

Brazil:

• 23°30′S, 46°48′W; 750 m asl: São Paulo State, tributaries to Rio Tiet, mosses or aquatic plants. du Bois-Reymond Marcus (1944)

Peru:

• 15°43′S, 70°43′W; 4,200 m asl: Puno Region, Lake Titicaca, edge of Laguna Tejane, mud. Marcus (1939)

Suriname:

• 05°52′N, 55°12′W; 0 m asl: Weg naar Zee at Paramaribo, swamp with plants ( Cyperus giganteus Vahl. and Montrichardia arborescens Schott), pH 7.5, soil and plankton sample No. 292. Van der Land (1970)

• 05°48′N, 55°10′W; 0 m asl: Paramaribo District, Latour near Paramaribo, ditch, ( Eichornia) and other plants (grass), soil and plankton sample (2 samples Nos. 313 & 314). Van der Land (1970)

• 05°46′N, 55°20′W; 0 m asl: Saramacca District, Uitkijk, dich (drainage channel 19) with floating aquatic plants (especially Eichornia) and between roots of plant ( Eichornia), pH 7.5, plankton sample (2 samples Nos. 293 & 294). Van der Land (1970)

• 05°46′N, 55°12′W; 0 m asl: Wanica District, Vierkinderenweg, S of Paramaribo, trench in rice field, soil sample No. 316. Van der Land (1970)

• 05°46′N, 55°12′W; 0 m asl: Wanica District, Noordbergerweg, S of Paramaribo, pond between rice fields overgrown with Eichornia, soil sample No. 317. Van der Land (1970)

• 05°46′N, 55°10′W; 0 m asl: Wanica District, Livorno near Paramaribo, swamp, pH 5.9, soil and plankton sample No. 297. Van der Land (1970)

• 05°46′N, 55°09′W; 0 m asl: Wanica District, bank of Tout Lui Faut Kanaal, pH 6.5, soil and plankton sample No. 298 lost. Van der Land (1970)

• 05°44′N, 55°10′W; 0 m asl: Wanica District, Houttuin near Paramaribo, puddle, pH 6.3, plankton sample (2 samples Nos. 300 & 301). Van der Land (1970)

• 05°42′N, 55°14′W; 0 m asl: Wanica District, Lelydorp, marsh and swamp with floating turf, pH 5.9, soil and plankton sample Nos. 302 (lost) & 303. Van der Land (1970)

• 05°36′N, 55°12′W; 0 m asl: Para District, Onverwacht, swamp with Montrichardia arborescens Schott, pH 5.9, soil and plankton sample No. 306. Van der Land (1970)

• 05°36′N, 55°08′W; 0 m asl: Para District, Onverdacht, bauxite lake, soil and plankton sample No 323. Van der Land (1970)

Uruguay:

• 31°23′S, 57°57′W; 50 m asl: Salto Department, Salto, mosses or lichens on rocks, trees or posts or aquatic macrophytes. Claps & Rossi (1997)

Record numbers: Argentina: 11, Brazil: 1, Peru: 1, Suriname: 11, Uruguay: 1; total: 25.

Remarks: Reports for both Pseudobiotus augusti and Isohypsibius augusti are included here as taxonomic confusion of the original P. augusti description has left the records split between Pseudobiotus and Thulinius . It is highly probable that records belong to both genera (Bertolani et al. 1999, Nelson et al. 1999). Marcus (1939) is the only Neotropical report for an otherwise Palaearctic Pseudobiotus megalonyx (McInnes 1994a), suggesting all South American records require re-examination.