Psilorhynchus rowleyi Hora and Misra 1941 known from the Chindwin–Irrawaddy drainage, formerly treated as a subspecies of the Ganga–Brahmaputra drainage species, Psilorhynchus homaloptera Hora and Mukerji 1935, is redescribed here based on newly collected materials and two syntypes in the Zoological Survey of India. It differs from the latter in having a larger eye (21.7–31.5 % head length vs. 13.4–19.4), a greater number of principal rays in the lower lobe of the caudal fin (9 vs. 8), a longer (vs. shorter) upper lobe of the caudal fin, fewer unbranched pectoral-fin rays (vii vs. viii), a higher number of predorsal scales (14–15 vs. 12–13), a lower number of transverse scales below the lateral line (2 vs. 2½), a narrower caudal peduncle (44.0–52.9 % caudal-peduncle length vs. 57.9–76.2) and a dome-shaped (vs. slightly pointed) rostral cap. The lectotype of P. rowleyi was also designated.
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We are grateful to K. Conway, Department of Wildlife and Fisheries Sciences and Biodiversity Research and Teaching Collections, Texas A and M University, USA, for literature and critical comments to improve the manuscript and also to K. Venkataraman and N. Sen for giving access to materials in ZSI Kolkata and ZSI-ERS respectively. The first author is grateful to the University Grants Commission for providing a University Research Scholarship and the third author to the Department of Biotechnology, New Delhi (Project No BCIL/NER-BPMC/2012/1549) for a research grant.
This article was registered in the Official Register of Zoological Nomenclature (ZooBank) as 53897509-1A66-49B0-9A7C-D80B3C00B95C.
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Shangningam, B., Kosygin, L. & Vishwanath, W. Redescription of Psilorhynchus rowleyi Hora and Misra 1941 (Cypriniformes: Psilorhynchidae). Ichthyol Res 60, 249–255 (2013). https://doi.org/10.1007/s10228-013-0344-0
- Psilorhynchus homaloptera
- Psilorhynchus rowleyi
- Chindwin drainage