Shibatta Oscar A
Museu de Zoologia, Departamento de Biologia Animal e Vegetal, Centro de Ciências Biológicas, Universidade Estadual de Londrina, 86051-990, Londrina, PR, Brazil..
Zootaxa. 2019 Sep 24;4674(2):zootaxa.4674.2.6. doi: 10.11646/zootaxa.4674.2.6.
A new species, Batrochoglanis castaneus, is described from the Aripuanã River basin, Brazil. It differs from congeners, except B. raninus and B. transmontanus, by the dark brown color of the body and a dark brown stripe on the caudal fin. The new species differs from B. raninus by the longer maxillary barbel, longer prepelvic length, greater prepectoral length, smaller anal-fin base length, and smaller head depth. The new species differs from B. transmontanus by the longer caudal-fin dorsal lobe, presence of a hyaline spot or stripe on pelvic, dorsal, and anal fins, longer maxillary barbel, longer pectoral-fin, and dorsal-fin spines, greater eye diameter, smaller head depth, and larger mouth width. A metapterygoid anteriorly bifurcated and the lateral line reaching the adipose fin present in the new species are interpreted as synapomorphies of Batrochoglanis. On the other hand, the distribution of pore and neuromasts of the laterosensory system of the head seems to be very conservative in the family. The new species is known only from the Aripuanã River basin, reinforcing its characteristics as an area of endemism for fishes in the Amazon basin.
一种新物种——栗色巴塔哥尼亚鲶鱼（Batrochoglanis castaneus），在巴西阿里普阿南河流域被发现并加以描述。它与同属物种不同，除了拉氏巴塔哥尼亚鲶鱼（B. raninus）和跨山巴塔哥尼亚鲶鱼（B. transmontanus），其身体呈深褐色，尾鳍上有一条深褐色条纹。新物种与拉氏巴塔哥尼亚鲶鱼的区别在于上颌须更长、腹鳍前长度更长、胸鳍前长度更长、臀鳍基部长度更小以及头部深度更小。新物种与跨山巴塔哥尼亚鲶鱼的区别在于尾鳍背叶更长、腹鳍、背鳍和臀鳍上有透明斑点或条纹、上颌须更长、胸鳍和背鳍棘更长、眼径更大、头部深度更小以及口宽更大。新物种中存在的前鳃盖骨前部二叉状以及侧线延伸至脂鳍被解释为巴塔哥尼亚鲶属的共有衍征。另一方面，头部侧线感觉系统的小孔和神经丘分布在该科中似乎非常保守。新物种仅在阿里普阿南河流域被发现，这进一步凸显了该流域作为亚马逊河流域鱼类特有区域的特征。
