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. 2019 Nov 1;11(11):637. doi: 10.3390/toxins11110637

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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(A) Maximum likelihood tree topology recovered from the analysis of 1982 genes, with 24 scorpion species. Bars to the right of termini indicate numbers of orthologs. Numbers on nodes indicate ultrafast bootstrap support values under 100. (B–G) Representative species of scorpions studied here: (B) Cercophonius squama (Gervais, 1843); (C) Urodacus yaschenkoi (Birula, 1903); (D) Urodacus elongatus Koch, 1977; (E) Hadrurus spadix Stahnke, 1940; (F) Hadrurus concolorous Stahnke, 1969; (G) Hadrurus arizonensis Ewing, 1928. Photos by Nick Volpe (C,D), Matthew Graham (B,E,G) and Carlos Santibañez (F).