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Kinosternon angustipons Legler 1965:617 Holotype: KU 43631 (photographed in the original description, Pl. 26); paratypes (13), KU 84882; UU 3756-60, 3762-67, 4189. Skull of KU 3766 illustrated in the original description, p. 620, Fig. 1, and KU 3756 (Pl. 27) and 3767 (Pl. 28) photographed in the original description., Published as part of Iverson, John B., 2022, A review of Chelonian type specimens (order Testudines), pp. 1-85 in Megataxa 7 (1) on page 44, DOI: 10.11646/megataxa.7.1.1, http://zenodo.org/record/5964441, {"references":["Legler, J. M. (1965) A new species of turtle, genus Kinosternon, from Central America. University of Kansas Publications of the Museum of Natural History, 15 (13), 617 - 625. https: // doi. org / 10.5962 / bhl. part. 7292"]}

The nearly complete skeleton of a mud turtle, Kinosternon skullridgescens, n. sp., is described from Santa Fe County, New Mexico. The specimen was collected from the early middle Miocene, early Barstovian, Skull Ridge Member of the Tesuque Formation (16.0–14.9 Ma) and is one of the oldest and most complete fossil representatives of the genus Kinosternon. Phylogenetically, the new taxon is placed on the stem of the flavescens group in conjunction with the extinct Kinosternon pojoaque from the late Barstovian of New Mexico. In addition to the flavescens group, K. skullridgescens shares morphological similarities with members of the subrubrum group (of North America), as well as with Kinosternon herrerai (from gulf drainages of eastern Mexico). Close proximity of the fossils K. skullridgescens and K. pojoaque to Mexico suggests that a small-plastroned ancestor of the extant taxa K. herrerai, Kinosternon angustipons (from lower Central America), and Kinosternon dunni (from northwestern South America)...

The complete skeleton of a fossil mud turtle, Kinosternon pojoaque, n. sp., is described from the late Barstovian Rodent Pocket, San Ildefonso Locality of Santa Fe County, New Mexico. The new species represents the oldest member of the Kinosternon flavescens group and suggests that this clade first evolved in the southwestern United States, which, along with northern Mexico, is the center of diversity for these turtles today. The new taxon exhibits plastral characters that suggest phylogenetic affinities with Kinosternon angustipons, Kinosternon dunni, Kinosternon herrerai, Kinosternon hirtipes, and Kinosternon sonoriense and is interpreted here as an example of a morphological intermediate between the clade composed of these taxa and the flavescens group. The new fossil, along with other Miocene Kinosternon fossils from New Mexico, provides evidence that the flavescens clade likely diverged from other southwestern, Central, and South American Kinosternon by at least the late Barstovian, 14.3–13....