Bourque—Middle–Late Miocene Kinosternon
831
Figure 6. Stereograph of Kinosternon pannekollops n. sp., FAM 12778, in ventral aspect. This species possesses a thick posterior carapacial margin. The concave plastral hindlobe suggests that this specimen represents a male. Scale bar equals 1 cm.
Kinosternon pannekollops new species Figures 4–6
Holotype.—FAM 12778, nearly complete shell of an adult, consisting of the carapace and plastron. The specimen is missing portions of the right P1, distal two-thirds of right P2, and anterior right P3; distal margins of the right P10, pygal, and left P9–10; portions of left P4–6; and anterior-most margins of the right epiplastron and left hyoplastron.
Diagnosis.—Autapomorphies: V1–4 much longer than wide with V3–4 sulcus that crosses C6 pair; thick anteriorly extensive axillary buttressing on visceral P3–4 (that terminates on P2); deeply incised anterior musk duct groove with its originating foramen on the anterior of P3 and its terminus housed by a deep foramen situated on the anterior-most P2. Symplesiomorphies: nuchal contacts N1 (shared with Kinosternon skullridgescens, Kinosternon pojoaque, Kinosternon rincon, the Kinosternon flavescens and subrubrum groups, Kinosternon alamosae Berry and Legler, 1980, Kinosternon wakeeniense, and Kinosternon notolophus [described below]); P1 broadly contacts C1 dorsally
(shared with Kinosternon herrerai, Kinosternon hippocrepis, and K. skullridgescens) Synapomorphies: Costiform processes of the nuchal reduced, contacting P1 only and not extending to P2 (shared with Kinosternon herrerai and K. wakeeniense); reduced number (five) of neurals (shared with Kinosternon acutum [Gray, 1831], Kinosternon angustipons, Kinosternon chimalhuaca Berry, Seidel, and Iverson, 1997, Kinosternon cruentatum [Duméril and Bibron in Duméril and Duméril, 1851], Kinosternon dunni, Kinosternon hippocrepis, Kinosternon leucostomum [Duméril and Bibron in Duméril and Duméril, 1851], K. rincon, and K. pojoaque); N1–5 posteriorly symmetrically short-sided (shared with Kinosternon hirtipes [Wagler, 1830], Kinosternon integrum, Kinosternon oaxacae Berry and Iverson, 1980, and K. pojoaque); carapacial carina- tion absent (shared with the K. flavescens and subrubrum groups, K. pojoaque, K. skullridgescens, K. angustipons, and K. dunni); posterior marginals M8–9 thick and broad ventrally with deep visceral step and M10–11 taper to thin (shared with K. subrubrum, Kinosternon baurii, K. angustipons, Kinosternon sonoriense sonoriense [LeConte, 1854], and K. notolophus); posterior marginals not flared (shared with the
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