Myloplus nigrolineatus Ota, Machado, Andrade, Collins, Farias & Hrbek, 2020
Blackline myleus

Family:  Serrasalmidae (Piranhas and pacus), subfamily: Myleinae
Max. size:  23.77 cm SL (male/unsexed)
Environment:  benthopelagic; freshwater
Distribution:  South America: Brazil.
Diagnosis:  Dorsal soft rays (total): 25-29; Anal soft rays: 33-38. This species is distinguished from its congeners by the following characters: highly concentrated dark chromatophores on the lateral-line scales, resulting in a markedly, dark pigmentation along the lateral line; it differs from arnoldi, lobatus, lucienae, planquettei, rhomboidalis, schomburgkii, zorroi by having 25-29 branched dorsal-fin rays (vs. 18-24); from ternetzi by the presence of a symphyseal pair of conical teeth posterior to the main row of dentary (vs. absence); from asterias, levis, rubripinnis, taphorni, tiete, torquatus, tumukumak by having 89-114 lateral line scales from supracleithrum to end of hypural plate (vs. 56-89) and 98-120 total perforated lateral line scales (vs. 59-97) (Ref. 123127).
Biology:  This species was reported to inhabit slow-flowing habitats such as backwaters and lake, feedng mainly on aquatic and terrestrial plants. Collection localities include clearwater rivers chemically characterized by a low concentration of suspended sediments, dissolved minerals and humic compounds and also from extremely acidic oligotrophic blackwaters. The type locality is also a blackwater system that has its headwaters in the Purus-Madeira interfluvium and like other blackwater rivers, is of low sediment load and low pH. These blackwater environments are reported to be inhospitable to certain species of fish (Ref. 123127).
IUCN Red List Status: Not Evaluated (N.E.) Ref. (130435)
Threat to humans:  harmless


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