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Melanorivulus planaltinus (Costa & Brasil, 2008) |
| Family: | Rivulidae (Rivulines), subfamily: Rivulinae | |||
| Max. size: | 3.11 cm SL (male/unsexed); 2.76 cm SL (female) | |||
| Environment: | benthopelagic; freshwater | |||
| Distribution: | South America: known only from the type locality in the Cocal River floodplains, Maranhão River drainage, upper Tocantins River basin in Brazil. | |||
| Diagnosis: | Dorsal soft rays (total): 8-10; Anal soft rays: 12-14. Belongs to the subgenus Melanorivulus by having all the subgeneric synapomorphic characters: short and pointed dorsal portion of preopercle; melanophores concentrated on opercular region to form oblique stripes; melanophores concentrated on margins of unpaired fins in females; black spot on upper portion of caudal-fin base not close to fin margin in females. Differs from all other species of Melanorivulus by the following characters: lack or extreme reduction of pelvic fins and pelvic girdle; vomerine teeth 5-7; and basihyal width about 70% basihyal length (Ref. 75171). | |||
| Biology: | ||||
| IUCN Red List Status: | Data deficient (DD); Date assessed: 18 May 2022 Ref. (130435) | |||
| Threat to humans: | harmless | |||