Melanorivulus Litteratus (Melanorivulus litteratus), first described by Costa, 2005 is a tiny fish in the family Rivulidae (order Cyprinodontiformes). Adults typically reach 2.80 cm in maximum length. It inhabits freshwater systems including rivers, streams, and lakes. It occurs in Tropical waters. It is broadly omnivorous, taking invertebrates, plant matter, and detritus. On the IUCN Red List, it is classified as Least Concern.The species is kept in the aquarium hobby. Care requirements and behaviour align broadly with other Rivulidae kept in the hobby.
Distinguished by the unique color pattern on the flank in males, with red marks variable in shape, highly overlapped (vs. never a similar color pattern), and caudal fn with dark gray stripe posterior to caudal spot in females (vs. stripe absent). Also distinguished from all other members of the R. punctatus group by the combination of the following features: frontal squamation F-patterned (vs. E-patterned), flank with striking iridescent colors in male, contrasting metallic blue to greenish blue on middle of flank with light purplish blue above anal fin and brownish golden on anterior dorsolateralportion of body (vs. never a similar color pattern), no distinctive dark stripe along midline of flank (vs. stripe present); red bars on caudal fin in males (vs. bars absent).: elongated.
Behavioural data for Melanorivulus Litteratus is currently being reviewed.
Freshwater; benthopelagic. Tropical South America: Upper rio Araguaia basin, central Brazil.
The following diseases are known to affect Melanorivulus Litteratus.
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