(Serpentes: Colubridae) - compiled by Van Wallach
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Head drawings: genus
Hydrops(Serpentes: Colubridae) - compiled by Van Wallach
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 | Hydrops caesurus (from Scrocchi & al. 2005) |
 | Hydrops caesurus (from Scrocchi & al. 2005) |
 | Hydrops triangularis (from Chippaux 1986) |
 | Hydrops triangularis (from Emsley 1977) |
 | Hydrops triangularis (from Lancini & Kornacker 1989) |
 | Hydrops triangularis (from Pérez-Santos & Moreno 1988) |
 | Hydrops triangularis (from Cei 1993) |
 | Hydrops triangularis (from Cei 1993) |
 | Hydrops triangularis (from Cei 1993) |