What key identification factor simplifies the identification of the Western Worm Snake (C. vermis) compared to the Eastern species complex?

Answer

C. vermis has no recognized subspecies, simplifying identification across its range.

While both the Eastern and Western worm snakes belong to closely related complexes, the internal taxonomic structure of the Western Worm Snake (*C. vermis*) is simpler than that of its Eastern counterpart. The Eastern species complex includes recognized subspecies, such as *C. a. helenae*, which introduce variations in scale patterns and size that require careful observation for accurate identification. In contrast, *C. vermis* is a distinct species that has no recognized subspecies documented across its range. This lack of further internal divisions means that identification across the Western species' territory relies more consistently on its established characteristics, such as its typical coloration contrast, without needing to account for regional subspecies variations.

What key identification factor simplifies the identification of the Western Worm Snake (C. vermis) compared to the Eastern species complex?

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