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It is a medium sized fish of about 5.5 " found in Brazil, South America.
It was first described by Kullander, 1997 , and has been placed in Genus Aequidens and subfamily Cichlasomatinae.
The Genus "Aequidens" is derived from Latin words, equips+equal+dens(teeth), which roughly translates to "Fish with equal teeth".
The species name refers to location Maués, and refers to the type locality, located in the drainage of the rio Maués.
It is found in South america,Brazil, Amazon River basin, in the Maués and Arapiuns rivers.
A.mauesanus is 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.
It is benthopelagic or swims above river bed at depths of about 1-3 m in black water rivers.
It is a omnivore in nature, and eats small insects, fish, algae etc.
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It is a medium sized fish having a Standard Length ( from tip of snout to begriming of tail fin) 5.5 " .
It is slender in appearance and can be easily distinguished uniquely by its color pattern.
- While the fish is juvenile the lateral band is continuous, but as the fish reaches adulthood the band is replaced by blackish blotches in posterior part.
- There is a small mid lateral spot and above it there is a prominent dark dorsal blotch which is separated from the mid lateral spot by wide light inter spaces.
There is only one other Aequidens species with a dorsal blotch and that is A. tubicen, however this blotch is found more towards dorsal side of the fish, a much wider light blotch anterior to the caudal spot, a dark blotch in the preopercular corner instead of a cheek spot.
- A.mauesanus has 25-26 E1 scales and 27-28 vertebra instead of more common 25-26 vertebra
It is known to live for 8-10 years.
It is found in black water rivers with a ph of 4-5 and dh range 3-9.
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