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AUTHOR

Sven O Kullander

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Aequidens mauesanus Kullander

Synonymy

Aequidens mauesanus Kullander, 1997. Ichthyol. Explor. Freshwaters 7: 378, fig. 1 (Brazil, Estado do Amazonas, rio Maués drainage, município do Maués, igarapé do rio Maraú).

Aequidens mauseanus. Holotype, MZUSP 7306, 134.1 mm SL. Photo © S.O. Kullander
Aequidens mauseanus. Holotype, MZUSP 7306, 134.1 mm SL. Photo: S.O. Kullander.

Diagnosis

A moderately large, relatively slender Aequidens species, uniquely distinguished by its colour pattern: (1) the lateral band is continuous in young, but posteriorly replaced by a row of blackish blotches in adults; (2) above the small midlateral spot is a prominent dark dorsal blotch which is separated from the midlateral spot by a wide light interspace on E2 row scales. The only other Aequidens species described with a dorsal blotch, Aequidens tubicen, has the lateral band course shifted dorsally, a much wider light blotch anterior to the caudal spot, a dark blotch in the preopercular corner instead of a cheek spot, dark-margined nuchal scales; and higher meristics, with 25-26 instead of usually 24 (rarely 25) E1 row scales and 27-28 instead of 25-26 vertebrae. (From Kullander, 1997.)

Twenty-two specimens were included in the original description. Eighteen could be sexed, and among those were two males, 76.6-79.6 mm, the remainder females or probable females, 50.6-134.1 mm.

Aequidens mauesanus. Live specimen in aquarium, originally from Vila Gorête on the lower rio Arapiuns. Specimen not preserved. Photo © F. Warzel
Aequidens mauesanus. Live specimen in aquarium, originally from Vila Gorête on the lower rio Arapiuns. Specimen not preserved. Photo: F. Warzel.

Holotype

MZUSP 7306. Adult female, 134.1 mm SL. Brazil, Estado do Amazonas, rio Maués drainage, municìpio do Maués, igarapé do rio Maraú. Collected 3 December 1967 by the Expedição Permanente da Amazônia (EPA).

Etymology

The species name is an adjective derived from Maués, and refers to the type locality, located in the drainage of the rio Maués.

Geographical distribution

Known only from the lower rio Maués, a tributary to the paraná Urariá, a channel of the rio Amazonas; and from the rio Arapiuns, a tributary of the lower rio Tapajós. The type locality is a small stream of the left bank of the rio Maraú at its mouth into the rio Maués.
Lifemapper map

Aequidens mauesanus. Live specimen, NRM 18454, 61.2 mm SL, immediately after capture in the lower rio Arapiuns between Vila de Cachoeira and Vila Brasil. Photo © R. Stawikowski
Aequidens mauesanus. Live specimen, NRM 18454, 61.2 mm SL, immediately after capture in the lower rio Arapiuns between Vila de Cachoeira and Vila Brasil. Photo: R. Stawikowski.

Natural history

Both the Maués and the Arapiuns are blackwater rivers, contrasting with their recipients, the whitewater Amazonas and the clearwater Tapajós. Little information is available on particular collecting sites. However, two specimens were collected 13 September 1995 on a sandy beach of the Arapiuns with tree litter and some small rocks. The water was clear, tea coloured, with an underwater sight about 2-2.5 m; temperature 31.5 °C, pH 4.65, conductivity 30 µScm-1.

References

KULLANDER, S.O. 1997.Aequidens mauesanus, a new species of cichlid fish from the Amazon basin, Brazil. Ichthyological Exploration of Freshwaters, 7: 377-383.