Mármol, G.M.D., Geniez, P., Neumann, A., Glaw, F. & Fritz, U. (2025) Phenotypic variability in the western grass snake Natrix astreptophora, with description of a new subspecies from Morocco. Zootaxa, 5693 (1), 41–65.
https://doi.org/10.11646/zootaxa.5693.1.3