J. Herman, M. Hovestadt-Euler, D.C. Hovestadt, and M. Stehmann (2002)
Contributions to the study of the comparative morphology of teeth and other relevant ichthyodorulites in living subraspecific taxa of Chondrichthyan fishes. Part B: Batomorphii 4: Order Torpediniformes – Family Narcinidae – Subfamily Narcininae – Genera: Benthobatis, Diplobatis, Discopyge and Narcine, Subfamily Narkinae – Genera: Bengalichthys, Crassinarke, Heteronarce, Narke, Temera, and Typhlonarke, Family Torpedinidae – Subfamily Torpedininae – Genus: Torpedo – Subgenus: T.(Tetronarke) and T. (Torpedo) and Subfamily Hypninae – Genus: Hypnos.
Bulletin de l'Institut Royal des Sciences Naturelles de Belgique - Bulletin van het Koninklijk Belgisch Instituut voor Natuurwetenschappen, 72:5-45.
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