Abstract
The morphology of the premaxilla, dentary, Weberian lamina, infraorbital series, vomer and frontal bones were observed in eight species of Glyptothorax of northeastern India. In G. botius, G. granulus, G. manipurensis, G. ngapang, G. striatus and G. ventrolineatus, the premaxilla consists only of proximal and distal tooth plates, the anterior portion of the dentary is slender and its dorsal surface bears villiform teeth, the lateral extension of posterior portion of Weberian lamina terminates at the level of the lateral margin of its anterior portion, and the frontal has a shallow orbital notch. In G. cavia and G. chindwinica, the premaxilla consists of proximal, distal and posterior elements on the roof of the oral cavity; the anterior portion of the dentary bears posterior extension of dentary tooth-plate; the lateral extension of the posterior portion of Weberian lamina extends almost to the distal tip of the fifth parapophysis; there are nine or ten infraorbital bones with a longer and broader body of the lacrimal; greatly enlarged vomerine head; and frontal bears a deep orbital notch. The jaw structure of G. burmanicus is discussed.
Highlights
Blyth (1860) described the genus Glyptothorax, for which Bleeker (186263) designated Glyptosternon striatus McClelland as the type species
In G. botius, G. granulus, G. manipurensis, G. ngapang, G. striatus and G. ventrolineatus, the premaxilla consists only of proximal and distal tooth plates, the anterior portion of the dentary is slender and its dorsal surface bears villiform teeth, the lateral extension of posterior portion of Weberian lamina terminates at the level of the lateral margin of its anterior portion, and the frontal has a shallow orbital notch
There are reports on the osteological studies of Glyptothorax, viz., Gauba (1966) on G. cavia (Hamilton) and Diogo et al (2002) on G. fukiensis (Rendahl), there are no reports of the comparative accounts on the osteology of the genus
Summary
Blyth (1860) described the genus Glyptothorax, for which Bleeker (186263) designated Glyptosternon striatus McClelland as the type species. de Pinna (1996) casts doubt on the monophyly of the genus Glyptothorax, citing the lack of unambiguous synapomorphies to diagnose it. His phylogenetic analysis of the Sisoroidea still recovered a monophyletic Sisoridae. This study attempts to identify the variation of bones i.e., premaxilla, dentary, infraorbital series, frontal, vomer and articulation of complex centrum with remaining vertebral column in eight species of Glyptothorax of north east India, viz. Glyptothorax botius (Hamilton), G. cavia (Hamilton), G. chindwinica Vishwanath & Linthoingambi.
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