Perez et al.—Miocene sharks and rays from Lago Bayano, Panama


523


Figure 5. Carcharhiniformes I: Hemipristis, Galeocerdo, and Physogaleus from the Chucunaque Formation. (1–16) Hemipristis serra Agassiz, 1843: (1–4)UF 281404, upper anterior tooth in lingual, labial, distal lateral, and mesial lateral view, respectively; (5–8) UF 281174, upper lateral tooth in lingual, labial, distal lateral, and mesial lateral view, respectively; (9–12) UF 281396, upper symphyseal tooth in lingual, labial, distal lateral, and mesial lateral view, respectively; (13–16) UF 281405, lower lateral tooth in lingual, labial, mesial lateral, and distal lateral view, respectively; (17–20) Galeocerdo aduncus (Agassiz, 1835), UF 275083, indeterminate position in lingual, labial, mesial lateral, and distal lateral view, respectively; (21–28) Galeocerdo cuvier (Peron and Lesueur, 1822): (21–24) UF 281397, indeterminate position in lingual, labial, distal lateral, and mesial lateral view, respectively; (25–28) UF 275145, indeterminate position in lingual, labial, distal lateral, and mesial lateral view, respectively; (29–32) Physogaleus contortus (Gibbes, 1849), UF 281170, indeterminate position in lingual, labial, mesial lateral, and distal lateral view, respectively. Photo credit: R. Leder.


Naturkunde, Karlsruhe, but have since been lost (Purdy et al., 2001).


Occurrence.—STRI 290116 and STRI 430011.


Description.—Moderately large teeth with a thick, distally arched crown; deeply notched on the distal edge. The mesial edge is convex with moderately sized serrations basally and fine serrations apically; the distal side has a coarsely serrated distal heel lacking secondary serrations and a concave cutting edge with fine serrations. The root is thick with a prominent lingual


protuberance and concave basal margin; there are numerous nutrient pores and a transverse nutrient groove may be poorly developed (e.g., UF 275083) or distinct (e.g., UF 281398); the distal root lobes are lingually recurved at the extremities, indicating overlapping teeth within the dentition (Purdy et al., 2001). Galeocerdo aduncus from the Chucunaque Formation has a CH = 10.2–11.7mm and CW = 18.7–18.9mm.


Materials.—Two isolated teeth; indeterminate position: UF 275083, UF 281398.


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