Bentley Rebecca Frances, Grant Steven, Tencatt Luiz Fernando Caserta
Sweet Briar, Crowthorne, Berkshire, England, RG45 6TJ..
Zootaxa. 2021 Mar 19;4948(2):zootaxa.4948.2.2. doi: 10.11646/zootaxa.4948.2.2.
A new Corydoras is described from the Blanco and Ucayali river basins in Peru. The new species can be distinguished from its congeners by having the following features: (I) posterior margin of dorsal-fin spine with laminar serrations directed towards the origin of the spine; (II) a long, wide, arched, and continuous black stripe, which runs parallel to the dorsal profile of the body, extending at least from the region below anterior origin of dorsal fin to the anterior half of the ventral caudal-fin lobe; (III) a black stripe transversally crossing the eye, forming the typical mask-like blotch; mask clearly not fused to arched stripe in most specimens; some specimens with mask separated from arched stripe by a thin line around the suture between neurocranium (in the region composed by the posteroventral margin of parieto-supraoccipital plus the posterodorsal margin of the compound pterotic) and first dorsolateral body plate; (IV) posterior margin of pectoral-fin spine with laminar serrations directed towards the origin of the spine; (V) pointed snout, presenting a long mesethmoid, with anterior tip larger than 50% of the entire length of the bone; and (V) ventral surface of trunk covered by small, non-coalescent platelets. A discussion on the possible positive adaptive value of the arc-striped color pattern is also provided.
一种新的兵鲶属鱼类在秘鲁的布兰科河和乌卡亚利河流域被描述。新物种可通过以下特征与其同属物种区分开来：(I) 背鳍棘的后缘有朝向棘起点的层状锯齿；(II) 一条长而宽、呈拱形且连续的黑色条纹，与身体的背侧轮廓平行，至少从前背鳍起点下方的区域延伸至尾鳍腹叶的前半部分；(III) 一条黑色条纹横向穿过眼睛，形成典型的面具状斑点；在大多数标本中，面具明显不与拱形条纹融合；一些标本的面具与拱形条纹在神经颅骨（在由顶枕骨后腹缘加复合翼耳骨后缘组成的区域）和第一背外侧体板之间的缝线周围由一条细线隔开；(IV) 胸鳍棘的后缘有朝向棘起点的层状锯齿；(V) 吻尖，有一个长的中筛骨，前端大于骨全长的50%；以及(V) 躯干腹面覆盖着小的、不相连的鳞片。还对弧形条纹颜色模式可能的积极适应价值进行了讨论。
