Trinectes fluviatilis (Meek & Hildebrand 1928)

Angulo, Arturo, 2021, New records and range extensions to the Costa Rican freshwater fish fauna, with an updated checklist, Zootaxa 5083 (1), pp. 1-72 : 10

13) Trinectes fluviatilis (Meek & Hildebrand 1928) ;

Achiridae .

Freshwater Sole; Lenguado Redondo Fluvial, Suela Fluvial ( Fig. 3G ).

Diagnosis: This species differs from the other species of the family occurring in freshwaters of the country (Pacific side) by the following combination of characters: absence of interbranchial foramen (vs. present in Achirus spp. ); pectoral fin usually absent [vs. usually present in Trinectes fonsecensis (Günther, 1862) ]; lateral line scales 90–98 (vs. 73–76 in T. fonsecensis ); caudal vertebrae 21 (vs. 19–20 in T. fonsecensis ); anal fin rays 43–46 [vs. 35–38 in Trinectes fimbriatus (Günther, 1862) ]; and coloration pattern (see Krupp 1995, Robertson & Allen 2015).

Basis of the record: Three specimens were captured in the Barranca and Coto River basins. One in the río Lagarto, near Punta Morales, Chomes, Puntarenas (10.08569, -84.92540), at 28 m. a.s.l., on January 25, 2021, by Arturo Angulo (UCR 3318-001). Another specimen was captured in río Sábalo, 2.5 Km E of Playa Zancudo (Coto River basin), on the Sabalos-Playa Zancudo road, Puntarenas (8.49517, -83.10448), at 15 m. a.s.l., on March 28, 2021. The third specimen was captured in the quebrada Cocal Amarillo (Coto River basin), 5 Km N of Pavones, on the Puerto Pilón-Pavones road, Puntarenas (8.43643, -83.09660), at 26 m. a.s.l., on March 30, 2021; both by Arturo Angulo, Jorge San Gil, Alejandro Oviedo and Juan Ignacio Abarca.

Remarks: This species inhabits estuarine areas and coastal environs; it could be considered as an opportunistic visitor of freshwater ecosystems ( Robertson & Allen 2015).

Figures

FIG. 3. New country records. (A) Mugil incilis, specimen captured in the Río Pacuare, near the mouth of the river, Siquirres, Limón (10.219424, -83.284898), at 8 m.a.s.l., on July 22, 2004, by Jorge Picado (UCR 2835-005). (B) Oligoplites saliens, specimen captured in the Caño Palma, near the Caño Palma Biological Station, Pococí, Limón (10.5938, -83.52731), at 11 m.a.s.l., on February 22, 2019, by Nathan Lovejoy et al. (UCR 3311-001). (C) Oreochromis aureus, specimen captured the Río Pacuar (Térraba river basin), 4 km SE of San Isidro del General, under bridge on road San Isidro-Dominical, San José (09.35264, -83.72790), at 619 m.a.s.l., on March 25, 2013 by Carlos Garita (UCR 3018-001). (D) Pangasianodon hypophthalmus, specimen captured in the laguna San Sebastian, Caño Negro, Alajuela (10.8630, -84.7807), at 41 m.a.s.l., on September 29, 2021, by Bryan Castro and Jader Urbina. (E) Rhencus macracanthus, specimen captured in the Río Lagarto, Chomes, Puntarenas (10.08320, -84.92064), at 15 m.a.s.l., on September 1, 1979, by William Bussing et al (UCR 1268-025). (F) Thalassoma bifasciatum, specimen captured in the Quebrada Cocles (Matina river basin), 2.5 km SE of Puerto Viejo, near the bridge on El Tucán-Cocles road, Limón (9.64221, -82.73588), at 22 m.a.s.l., on August 20, 2020, by Walter Carranza. (G) Trinectes fluviatilis, specimen captured in the Quebrada Cocal Amarillo, 5 Km N of Pavones, on the Puerto Pilón-Pavones road, Puntarenas (8.43643, - 83.09660), at 26 m.a.s.l., on March 30, 2021, by Arturo Angulo et al. (H) Trinectes xanthurus, specimen captured in the Río Tempisque (Tempisque river basin), at Puerto Humo, Guanacaste (10.31653, -85.35365), at 9 m.a.s.l., on January 25, 1976, by William Bussing et al. (UCR 0970-005). Range extensions. (I) Achirus declivis, specimen captured in the Río Moín, at the Puerto Fluvial JAPDEVA, Limón (09.99745, -83.08077), at 7 m.a.s.l., on December 14, 2006, by Karina Rodríguez (UCR 2761-003). (J) Amatitlania myrnae, specimen captured in the Río Estrella, Valle La Estrella, Limón (9.77552, -82.93240), at 13 m.a.s.l., on April 6, 2014, by Arturo Angulo. (K) Amphilophus citrinellus, specimen captured in the Río Bebedero, near Paso Real, Cañas, Guanacaste (10.43318, -85.15697), at 32 m.a.s.l., on August 7, 2021, by Luis Bolivar Montero-Chacón. (L) Brachyrhaphis olomina, specimens captured in an unnamed pound in the Reserva Biológica Monteverde, Altos de San Luis, Monteverde, Puntarenas (10.31667, -84.80932), at 1486 m.a.s.l., on July 6, 2019, by Arturo Angulo.