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FIGURE 1. Map showing manatee occurrences along the northwestern coast of the Gulf of Mexico. The two red stars mark the locations of fossil specimens from McFaddin Beach (to the northeast) and Corpus Christi Bay (to the southwest). The blue symbols indicate historical occurrences, including sightings (circles), caracasses (squares), and captured specimens (triangles). Historical distribution data are modified from Fertl et al. (2005). North at top.

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FIGURE 2. TxVP 46040-9, thoracic vertebral centrum. Dorsal to top. Scale bar equals 2 cm.

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FIGURE 3. SHSU 1-236, distal rib fragment. Scale bar equals 2 cm.

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FIGURE 4. SHSU 1-027, edentulous left dentary in lingual (A) and labial (B) views. Scale bar equals 2 cm.

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FIGURE 5. SHSU 1-231, edentulous right anterior maxilla fragment in dorsal (A) and ventral (B) views. Note the resorbed anterior alveolar region typical of manatees. The rubber band was not removed because it was considered to be part of the history of the specimen. Scale bar equals 2 cm.

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FIGURE 6. SHSU 1-235, mandibular symphysis with partial left dentary ramus in dorsal (A), ventral (B), and anterior (C) views. The shallow dorsoventral depth and low, rounded ventrally projecting boss (arrow) are diagnostic features of the extinct morphotype Trichechus manatus bakerorum. Scale bar equals 2 cm.

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