Premium
Hemiodus bimaculatus , a new species of Hemiodontidae from the Rio Tapajós drainage, Brazil (Ostariophysi: Characiformes)
Author(s) -
Nogueira Acácio F.,
Langeani Francisco,
NettoFerreira André L.
Publication year - 2019
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/jfb.13972
Subject(s) - biology , characiformes , peduncle (anatomy) , tributary , anatomy , zoology , fishery , fish <actinopterygii> , cartography , geography
Hemiodus bimaculatus sp. nov., is described from tributaries of the Rio Juruena and Rio Teles Pires in the upper Rio Tapajós basin. The new species is diagnosed from most congeners, except Hemiodus jatuarana , by having a conspicuous circular or horizontally elongate dark blotch on the caudal peduncle ( v . inconspicuous in H. iratapuru and absent in the other species). The new species differs from H. jatuarana by having a round midlateral spot on the flank ( v . absent in H. jatuarana ), 98–121 perforated scales in the lateral line ( v . 66–72 in H. jatuarana ), 23–28 scale series above and 14–19 below lateral line ( v . 12–13 above and 6–7 below in H. jatuarana ). Hemiodus bimaculatus is hypothesised to be related to species of the H. microlepis group, from which it also differs by having 11–25 epibranchial ( v . 26–34 in H. argenteus , 29–39 in H. microlepis , 21–42 in H. orthonops and 27–35 in H. parnaguae ) and 18–31 ceratobranchial ( v . 38–50 in H. argenteus , 43–58 in H. microlepis , 32–52 in H. orthonops and 34–48 in H. parnaguae ) gill rakers in the first arch.