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. 2017 Dec 12;5:e4056. doi: 10.7717/peerj.4056

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©2017 Lau and Jacobs

This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, reproduction and adaptation in any medium and for any purpose provided that it is properly attributed. For attribution, the original author(s), title, publication source (PeerJ) and either DOI or URL of the article must be cited.

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Dot plots showing external (A and C) and vertebral (B and D) morphological data; size of dots is proportional to the number of specimens (n). “Delta Edge” is the hypothesized hybrid zone; “Delta” is the territory for C. hubbsi; “Baja” and “Sonora” are the territories for C. regis. Refer to Tables 1 and 2 for location codes of modern and historical specimens, respectively. Six specimens from NWC and three specimens from YAV were excluded from the hemal spine data set (D) as these specimens were too small to reliably identify the presence/absence of the expanded process on the hemal spines (See Fig. S1).