Phenacogaster tegatus (Eigenmann, 1911)

Vera-Alcaraz, Héctor S., Rios, Gabriela & Emhart Vuletich, Jimmy D., 2017, Confirmation of the occurrence for seven fish species in Paraguay., Ichthyological Contributions of PecesCriollos 49, pp. 1-9 : 3-4

Phenacogaster tegatus (Eigenmann, 1911)

Synonyms. Vesicatrus tegatus Eigenmann, 1911 .

Morphology. Head large; snout short, tip acuminate; eye large. Body compressed, subrhomboidal; dorsal profile of body concave from snout to dorsal-fin insertion, straight from dorsal fin to caudal peduncle; ventral profile convex. Dorsal-fin insertion on midpoint of body; adipose fin small; low pectoral-fin insertion, its distal tip surpassing ventral-fin insertion; ventral fin surpassing anal-fin insertion; anal-fin base large, anal-fin insertion opposite to dorsal-fin insertion; caudal fin forked. Lateral line incomplete.

Measurements. Based in 5 specimens. Head length 26.8-29.3% in SL. Snout length 7.0-8.9% in SL. Upper jaw length 9.1-11.2% in SL. Eye diameter 7.6-10.5% in SL. Body depth 32.7-36.2% in SL.

Counts. Based in 5 specimens. Lateral line scales 5-9. Anal-fin rays iii-iv+32-35.

Coloration in alcohol. Body ground yellow with dispersed dark brown chromatophores. Small to moderate size humeral spot, its height smaller than eye diameter, located anterior to vertical line of dorsal-fin insertion and reaching second dorsal-fin ray vertical line. Caudal peduncle spot shape rhomboidal, posterior margin located on caudal-fin rays. All fins with dispersed small chromatophores on rays, more evident on anal fin distal tips.

Remarks. First listed in Paraguay by Mandelburger et al. (1996) in Lima, Departamento de San Pedro, no record of specimens.

Examined material. All from Paraguay: Departamento de San Pedro: MNHNP 442 , alc. 2, 30.5-33.3 mm SL, Valle a 3 km al noroeste de Lima, Lima . Departamento de Misiones: MNHNP 2474 , alc. 30, 18.9-27.5 mm SL, Arroyo Atinguy , Ayolas .