The mechanosensory system in batoids has a unique sensory canal distribution located on both dorsal and ventral surfaces of the body. Due to the opposite position of eyes and mouth, ventral lateral-line canals are essential to detect and capture prey buried in the substrate. The present study analyzes the density of neuromasts in ventral lateral-line canals as well as their specific distribution patterns to help to understand the mechanisms involved in the foraging activities in potamotrygonid stingrays. The organization of the lateral-line canals was described in Potamotrygon albimaculata , P. jabuti and P. schroederi . Neuromasts were quantified in each canal of the ventral surface and endemic their densities were compared among P. albimaculata , P. jabuti , P. schroederi , P. wallacei , and Paratrygon aiereba . The orbito-nasal component of the infraorbital canal was examined for all genera of Potamotrygoninae to understand its origin and connection patterns. Despite similarities in the morphology of the lateral line in the examined potamotrygonid species, differences of the densities of neuromasts were observed. The distinct web-like infraorbital canal in Paratrygon aiereba held a significantly higher number of neuromasts, which apparently compensates the lower density of neuromasts along its ventral surface. The orbito-nasal component of the infraorbital canal presents connections between infraorbital and nasal canals, except for P. aiereba , which has a supra-infraorbital canals’ connection. The complex distribution of lateral line canals and their neuromasts indicate distinct sensory abilities that probably provide a high capability to detect a variety of prey in different types of substrate.

中文翻译：

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神经肥大分布及其与新热带淡水黄貂鱼（Elasmobranchii：Potamotrygonidae）的摄食相关性

batoids 的机械感觉系统具有独特的感觉管分布，位于身体的背侧和腹侧表面。由于眼睛和嘴巴的位置相反，腹侧侧线管对于探测和捕获埋在基质中的猎物至关重要。本研究分析了腹侧侧线管中神经瘤的密度及其具体分布模式，以帮助了解参与黄貂鱼觅食活动的机制。Potamotrygon albimaculata、P. jabuti 和 P. schroederi 中描述了侧线运河的组织。在腹面的每个管道中量化神经瘤，并在 P. albimaculata、P. jabuti、P. schroederi、P. wallacei 和 Paratrygon aiereba 中比较它们的地方性密度。对所有 Potamotrygoninae 属的眶下管的眶鼻部分进行了检查，以了解其起源和连接模式。尽管所检查的potamotrygonid物种侧线的形态相似，但观察到神经瘤的密度差异。Paratrygon aiereba 中独特的网状眶下管具有明显更多的神经瘤，这显然补偿了沿其腹面的较低密度的神经瘤。眶下管的眶鼻部分呈现眶下管和鼻管之间的连接，但P. aiereba 除外，它具有眶上管的连接。