Ota Rafaela P, Lima Flávio C T, Pavanelli Carla S
Programa de Pós-Graduação em Biologia de Água Doce e Pesca Interior, Instituto Nacional de Pesquisas da Amazônia, Coleção de Peixes, Avenida André Araújo, 2936, C. P. 2223, 69060-375 Manaus, Amazonas, Brazil; Email:
Núcleo de Pesquisas em Limnologia, Ictiologia e Aquicultura, Universidade Estadual de Maringá, Av. Colombo, 5790, 87020-900 Maringá, Paraná, Brazil.; Email:
Zootaxa. 2015 Apr 21;3948(2):218-32. doi: 10.11646/zootaxa.3948.2.4.
A new species of Hemigrammus is described from the middle rio Solimões/Amazonas and tributaries, upper and middle rio Madeira, and rio Paraná-Paraguai basins in Brazil and Paraguay. The new species is most similar among congeners with Hemigrammus marginatus, with which it shares similar caudal-fin pigmentation pattern. The new species can be distinguished from Hemigrammus marginatus by possessing two conspicuous dark patches of pigmentation on caudal fin, occupying most of caudal-fin lobes, except the tips, by having two dark narrow stripes along anal-fin base, and by possessing 5-8 pored lateral line scales. The new species differs from Hyphessobrycon diancistrus, which is similar in color pattern and general body shape, by the presence of small scales on caudal-fin lobes, occupying approximately its basal third, by the presence of two narrow stripes along anal fin base, and by the absence of bony hooks on analfin in mature males. The occurrence of the new species in both Amazon and rio Paraná-Paraguai basins is discussed in order to clarify and expand recent discussions on the biogeographical relationships between both river systems.
一种新的半线脂鲤属物种被描述，其分布于巴西和巴拉圭的索利蒙伊斯河/亚马逊河中游及其支流、马德拉河上游和中游以及巴拉那 - 巴拉圭河盆地。该新物种在同属物种中与边缘半线脂鲤最为相似，二者尾鳍色素沉着模式相似。新物种可通过以下特征与边缘半线脂鲤区分开来：尾鳍上有两个明显的深色色素沉着斑块，占据尾鳍叶的大部分区域，除了尖端；沿臀鳍基部有两条深色窄条纹；有5 - 8个有孔侧线鳞。新物种与颜色模式和总体体型相似的点纹魮脂鲤不同之处在于：尾鳍叶上有小鳞片，约占据其基部三分之一；沿臀鳍基部有两条窄条纹；成熟雄性臀鳍上没有骨质钩。文中讨论了该新物种在亚马逊河和巴拉那 - 巴拉圭河盆地的出现情况，以澄清和扩展近期关于这两个河流系统生物地理关系的讨论。
