Figueiredo Carlos Augusto, Moreira Cristiano R
Universidade Federal do Estado do Rio de Janeiro, Instituto de Biociências, Departamento de Ciências do Ambiente. Av. Pasteur, 458/sala 512F, 22290-240, Rio de Janeiro, RJ, Brazil..
Zootaxa. 2018 Aug 22;4461(3):438-444. doi: 10.11646/zootaxa.4464.3.9.
A new species, Poecilia (Pamphorichthys) akroa, is described from the Rio Tocantins drainage, Brazil. The new species differs from the remaining species of the genus by the possession of 10 or 11 pectoral-fin rays, entire preopercular ramus and posterior portion of the supraorbital ramus of the cephalic sensory system enclosed in canals, a faint longitudinal band along the body, a single gonapophysis, a homogeneous reticulate color pattern on sides of body, urogenital region of females heavily pigmented, distalmost segments of the anterior branch (4a) of the fourth gonopodial ray fused into an elongated segment turned anteriorly, subdistal segments of anterior branch (5a) of fifth gonopodial ray simple, without anterior (ventral) projections, dorsal fin with pigmentation at its distal portion and with a basal black blotch, and chromatophores more concentrated on the posterior margin of the mid-ventral scale series of the caudal peduncle and ventrolateral margin of the adjacent scales forming a series of rhombi posterior to anal fin.
一种新物种，即巴西托坎廷斯河水系的阿克罗波氏食蚊鱼（Poecilia (Pamphorichthys) akroa）被描述。该新物种与该属的其他物种的区别在于：拥有10或11根胸鳍鳍条；头部感觉系统的眶前支和眶上支后部完全被包于管内；身体上有一条淡淡的纵向条纹；有一个单一的生殖突；身体侧面有均匀的网状颜色图案；雌性的泌尿生殖区域色素沉着严重；第四生殖肢鳍条前支（4a）的最远端节段融合成一个向前弯曲拉长的节段；第五生殖肢鳍条前支（5a）的亚远端节段简单，无前（腹）突出；背鳍在其远端部分有色素沉着且有一个基部黑斑；色素细胞更集中于尾柄腹侧中部鳞片系列的后缘以及相邻鳞片的腹外侧边缘，在臀鳍后方形成一系列菱形。
