Exostoma tenuicaudata, a new species of glyptosternine catfish (Siluriformes: Sisoridae) from the upper Brahmaputra drainage, northeastern India

Abstract

Glyptosternines are highly specialized sisorid catfishes with greatly depressed body profiles; enlarged, horizontally extended paired fins, modified for adhesion, typically inhabiting torrential waters in rocky mountain streams and rivers. Their range of distribution extends from the upper reaches of the Amu Darya River drainage in Turkmenistan southwards and eastwards to Indochina and the Yangtze River (Changjiang) drainage of central China, and the Mekong and Salween drainages in northern and western Thailand (Vidthayanon et al. 2009; Ng & Vidthayanon 2014).

中国云南怒江水系鰋属鱼类一新种

“…Recent workers ( Lalramliana et al, 2015 ; Ng & Vidthayanon, 2014 ; Talwar & Jhingran, 1991 ; Tamang et al, 2015 ; Vishwanath & Joyshree, 2007 ) all treated E . labiatum and E .…”

“…By comparison of available data from our material and literatures ( Tamang et al, 2015 ; Vishwanath & Joyshree, 2007 ), E . labiatum can be readily distinguished from E .…”

“…Exostoma Blyth, 1860 is a genus of the subfamily Glyptosterninae with nine species occurring in the Brahmaputra, Chao Phraya, Irrawaddy and Salween River drainages in China, India, Myanmar (=Burma) and Thailand ( Chu et al, 1990 ; Hora & Silas, 1952 ; Lalramliana et al, 2015 ; Ng & Vidthayanon, 2014 ; Tamang et al, 2015 ; Vishwanath & Joyshree, 2007 ; Wu & Wu, 1992 ). The genus is diagnosed by: continuous post-labial groove; gill openings not extending onto venter; homodont dentition; oar-shaped, distally flattened teeth in both jaws; tooth patches separated in upper jaw; 10–11 branched pectoral rays ( Thomson & Page, 2006 ).…”

Comparative Mitogenomics of Two Sympatric Catfishes of Exostoma (Siluriformes: Sisoridae) from the Lower Yarlung Tsangpo River and Its Application for Phylogenetic Consideration

“…The subfamily Glyptosternae is a specialized group of catfishes belonging to the order Siluriformes and family Sisoridae, and is found primarily in the Tibetan Plateau and adjacent drainage basins. The genus Exostoma Blyth 1860—a clade of glyptosternine catfishes—can be distinguished by their having a continuous post-labial groove, flattened ventral surface of the body with horizontally patulous paired fins specified for adhesion, and distally flattened oar-shaped homodont dentition in two separated patches on both the upper and lower jaws [ 5 , 6 ]. Fishes of this genus generally dwell beneath the rocks in torrential streams and rivers, with a distribution range across from the Yarlung Tsangpo–Brahmaputra River drainage eastwards to the Chao Phraya River drainage in northwestern Thailand [ 7 ].…”