Department of Ichthyology, American Museum of Natural History, New York, New York, USA.
Laboratory of Systematics and Evolution of Teleost Fishes, Institute of Biology, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil.
J Fish Biol. 2021 Nov;99(5):1741-1745. doi: 10.1111/jfb.14841. Epub 2021 Jul 18.
Morphological examination of Potamoglanis specimens from three localities in the Essequibo River basin, Guyana, and one location in the Branco River basin, Brazil, confirmed their identification as Potamoglanis wapixana - a species originally described from only the Branco River basin. Morphological similarity of these miniature catfishes on opposite sides of the Rupununi savannah watershed divide and new records from lentic habitat suggest that either their modern populations predate the Pliocene division of the Branco and Essequibo rivers or the species is capable of living in and/or migrating across the Rupununi Portal - a seasonally flooded hydrological connection known to facilitate the movement of mostly much larger fishes between the Branco and Essequibo basins.
对来自圭亚那埃塞奎博河流域三个地点和巴西布朗库河流域一个地点的波塔莫加兰尼斯标本进行形态学检查，证实它们被鉴定为波塔莫加兰尼斯瓦皮萨纳——一种最初仅在布朗库河流域被描述的物种。这些位于鲁本努尼萨凡纳分水岭两侧的小型鲶鱼在形态上的相似性，以及在静水环境中的新记录表明，要么它们的现代种群早于上新世布朗库河和埃塞奎博河的划分，要么该物种能够生活在和/或迁移穿过鲁本努尼门户——一个季节性洪水泛滥的水文连接，已知这有助于在布朗库和埃塞奎博流域之间移动大多数体型较大的鱼类。
