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Analysis of 477 base pairs of the mitochondrial tRNA<jats:sup>Pro<\/jats:sup>\u2010tRNA<jats:sup>Phe<\/jats:sup>\u2010Dloop region revealed the presence of pure<jats:italic>C<\/jats:italic>.<jats:italic>acutus<\/jats:italic>(<jats:italic>N=<\/jats:italic>43) and<jats:italic>C. moreletii<\/jats:italic>(<jats:italic>N=<\/jats:italic>56), as well as a high proportion of interspecific hybrids (<jats:italic>N=<\/jats:italic>17, 14.6%) in the Yucatan Peninsula, Mexico. Although all individuals could be assigned to one species or other based on phenotypic characters, some had been characterized as potential hybrids in the field by anomalous scale counts. The hybridization zone lies along the area of sympatry between<jats:italic>C. acutus<\/jats:italic>and<jats:italic>C. moreletii<\/jats:italic>investigated in this study, but extends further inland if hybrid localities from Belize are included. Hybridization in the Yucatan Peninsula is bidirectional, which indicates considerably more genetic contact between these species than previously recognized, and is probably more detrimental to the genetic integrity of smaller<jats:italic>C. acutus<\/jats:italic>populations. A more intensive study of the pattern of hybridization is warranted and supports continued classification of<jats:italic>C. acutus<\/jats:italic>as a critically threatened species in the Yucatan Peninsula.<jats:italic>J. Exp. Zool. 309A:661\u2013673, 2008<\/jats:italic>. \u00a9 2008 Wiley\u2010Liss, Inc.<\/jats:p>","DOI":"10.1002\/jez.473","type":"journal-article","created":{"date-parts":[[2008,7,14]],"date-time":"2008-07-14T13:42:41Z","timestamp":1216042961000},"page":"661-673","source":"Crossref","is-referenced-by-count":49,"title":["Hybridization between<i>Crocodylus acutus<\/i>and<i>Crocodylus moreletii<\/i>in the Yucatan Peninsula: I. evidence from mitochondrial DNA and morphology"],"prefix":"10.1002","volume":"309A","author":[{"given":"Jos\u00e9 Rogelio","family":"Cede\u00f1o\u2010V\u00e1zquez","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"David","family":"Rodriguez","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sophie","family":"Calm\u00e9","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"James Perran","family":"Ross","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Llewellyn D.","family":"Densmore","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"John B.","family":"Thorbjarnarson","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2008,7,14]]},"reference":[{"key":"e_1_2_1_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/0006-3207(80)90040-3"},{"key":"e_1_2_1_3_1","first-page":"11","article-title":"Observations on nesting behavior of Crocodylus acutus","volume":"17","author":"Alonso\u2010Tabet M","year":"1998","journal-title":"Crocodile Spec Group Newsl"},{"key":"e_1_2_1_4_1","doi-asserted-by":"crossref","DOI":"10.1093\/oso\/9780195099744.001.0001","volume-title":"Natural hybridization and evolution. 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