@article{fdi:010069243, title = {{A} new silver dollar species of {M}etynnis {C}ope, 1878 ({C}haraciformes : {S}errasalmidae) from {N}orthwestern {B}razil and {S}outhern {V}enezuela}, author = {{O}ta, {R}. {P}. and {P}y-{D}aniel, {L}. {H}. {R}. and {J}{\'e}gu, {M}ichel}, editor = {}, language = {{ENG}}, abstract = {{A} new {M}etynnis is described from the rio {N}egro in {B}razil and {V}enezuela, and from black- or clearwater tributaries in {B}razil including the rios {P}arauari, {U}atuma, {T}rombetas, and {S}ucunduri (the latter belonging to the rio {M}adeira basin). {T}he new species can be distinguished readily from all congeners by having a high concentration of dark chromatophores on the lateral line scales. {I}t can be further distinguished by the combination of head length 24.3-27.5% of {SL}, 13-18 gill-rakers on upper limb and 16-24 gill-rakers on lower limb. {T}he new species is most similar to and likely most closely related to {M}etynnis hypsauchen. {T}hese two species share a similar color pattern, body shape and sexual dimorphism of the anal fin. {H}owever, they differ in that {M}. hypsauchen has a lightly pigmented lateral line. {T}he new species is also distinguished from {M}. hypsauchen by having 56-65 predorsal scales and 90-104 lateral line scales (vs. 36-54, and 65-82, respectively). {A} detailed osteological description of the new species is provided.}, keywords = {{B}iogeography ; {M}etynnis hypsauchen ; {O}steological description ; {P}hylogeny ; {T}axonomy ; {BRESIL} ; {VENEZUELA}}, booktitle = {}, journal = {{N}eotropical {I}chthyology}, volume = {14}, numero = {4}, pages = {e160023 [12 p.]}, ISSN = {1679-6225}, year = {2016}, DOI = {10.1590/1982-0224-20160023}, URL = {https://www.documentation.ird.fr/hor/fdi:010069243}, }