Figure 4 from: Rezaie-Atagholipour M, Ghezellou P, Hesni MA, Dakhteh SMH, Ahmadian H, Vidal N (2016) Sea snakes (Elapidae, Hydrophiinae) in their westernmost extent: an updated and illustrated checklist and key to the species in the Persian Gulf and Gulf of Oman. ZooKeys 622: 129-164. https://doi.org/10.3897/zookeys.622.9939

Figure 4 - Various shapes of ventrals on the mid-body of sea snakes of the genus Hydrophis in the Persian Gulf and Gulf of Oman: a wide and enlarged, more or less rectangular in shape (Hydrophis viperinus) b medium size, distinguishable from the adjacent scales, more or less hexagonal in shape (Hydrophis curtus) c and d small and slightly distinguishable from adjacent scales (Hydrophis ornatus and Hydrophis lapemoides, respectively) e and f small and more or less indistinguishable from adjacent scales (Hydrophis schistosus and Hydrophis platurus, respectively).