@article{cadena_schweitzer_2014, title={A Pelomedusoid Turtle from the Paleocene-Eocene of Colombia Exhibiting Preservation of Blood Vessels and Osteocytes}, volume={48}, ISSN={["1937-2418"]}, DOI={10.1670/13-046}, abstractNote={Abstract We describe a Paleocene–Eocene pelomedusoid turtle from tropical South America in a new fossiliferous locality, from Los Cuervos Formation, at the Calenturitas Coal Mine, Colombia. Although no further systematic precision beyond Pelomedusoides incertae sedis can be supported, the presence of an ischial scar positioned far anteriorly to the anal notch, and a strongly decorated ventral surface of the plastron, indicate that this specimen is potentially related to the bothremydid clade formed by Puentemys–Foxemys. We also demonstrate the potential organic preservation of osteocytes and blood vessels for this specimen, indicating that preservation of soft tissue such as vessels and bone cells in the fossil record is independent of bone type, fossil site, or locality; occurring in different lineages of vertebrates; and that it is even possible to occur in tropical depositional environments during a period of maximum global warming such as the Paleocene–Eocene. Resumen Aqui describimos la primera ocurencia de tortugas pelomedusoid del Paleoceno–Eoceno en la parte tropical de Suramérica, en una nueva localidad fósilifera, de la Formación Los Cuervos, en la mina de carbón Calenturitas, Colombia. Aunque, no mayor precisión sistemática puede ser soportada más que Pelomedusoides incertae sedis, la presencia de una cicatriz isquial posicionada muy anteriormente a la escotadura anal y una fuertemente decorada superficie ventral del plastron, indican que el especimen esta relacionado con el clado bothremydido formado por Puentemys–Foxemys. También demostramos la posible preservación orgánica de osteocitos y vasos sanguineos para este especimen; indicando que la preservación de tejidos blandos como vasos y celulas oseas en el registro fósil es independiente del tipo de hueso, sitio fósil o localidad, ocurriendo en diferentes linajes de vertebrados, y que es possible que ocurra en ambientes deposicionales tropicales, durante periodos de maximo calentamiento global como el Paleoceno–Eoceno.}, number={4}, journal={JOURNAL OF HERPETOLOGY}, author={Cadena, Edwin A. and Schweitzer, Mary H.}, year={2014}, month={Dec}, pages={461–465} }
 @article{cadena_ksepka_norell_2013, title={New material of Mongolemys elegans Khosatzky and Mlynarski, 1971 (Testudines: Lindholmemydidae), from the Late Cretaceous of Mongolia with comments on bone histology and phylogeny}, number={3766}, journal={American Museum Novitates}, author={Cadena, E. A. and Ksepka, D. T. and Norell, M. A.}, year={2013}, pages={1–27} }
 @article{cadena_bloch_jaramillo_2012, title={New bothremydid turtle (Testudines, Pleurodira) from the Paleocene of Northeastern Colombia}, volume={86}, number={4}, journal={Journal of Paleontology}, author={Cadena, E. A. and Bloch, J. I. and Jaramillo, C. A.}, year={2012}, pages={688–698} }
 @article{cadena_ksepka_jaramillo_bloch_2012, title={New pelomedusoid turtles from the late Palaeocene Cerrejon Formation of Colombia and their implications for phylogeny and body size evolution}, volume={10}, number={2}, journal={Journal of Systematic Palaeontology}, author={Cadena, E. A. and Ksepka, D. T. and Jaramillo, C. A. and Bloch, J. I.}, year={2012}, pages={313–331} }
 @article{rodriguez-forero_oboh-ikuenobe_jaramillo-munoz_rueda-serrano_cadena-rueda_2012, title={Palynology of the Eocene Esmeraldas formation, Middle Magdalena Valley Basin, Colombia}, volume={36}, journal={Palynology}, author={Rodriguez-Forero, G. and Oboh-Ikuenobe, F. E. and Jaramillo-Munoz, C. and Rueda-Serrano, M. J. and Cadena-Rueda, E.}, year={2012}, pages={96–111} }
 @misc{cadena_schweitzer_2012, title={Variation in osteocytes morphology vs bone type in turtle shell and their exceptional preservation from the Jurassic to the present}, volume={51}, ISSN={["1873-2763"]}, DOI={10.1016/j.bone.2012.05.002}, abstractNote={Here we describe variations in osteocytes derived from each of the three bone layers that comprise the turtle shell. We examine osteocytes in bone from four extant turtle species to form a morphological 'baseline', and then compare these with morphologies of osteocytes preserved in Cenozoic and Mesozoic fossils. Two different morphotypes of osteocytes are recognized: flattened-oblate osteocytes (FO osteocytes), which are particularly abundant in the internal cortex and lamellae of secondary osteons in cancellous bone, and stellate osteocytes (SO osteocytes), principally present in the interstitial lamellae between secondary osteons and external cortex. We show that the morphology of osteocytes in each of the three bone layers is conserved through ontogeny. We also demonstrate that these morphological variations are phylogenetically independent, as well as independent of the bone origin (intramembranous or endochondral). Preservation of microstructures consistent with osteocytes in the morphology in Cenozoic and Mesozoic fossil turtle bones appears to be common, and occurs in diverse diagenetic environments including marine, freshwater, and terrestrial deposits. These data have potential to illuminate aspects of turtle biology and evolution previously unapproachable, such as estimates of genome size of extinct species, differences in metabolic rates among different bones from a single individual, and potential function of osteocytes as capsules for preservation of ancient biomolecules.}, number={3}, journal={BONE}, author={Cadena, Edwin A. and Schweitzer, Mary H.}, year={2012}, month={Sep}, pages={614–620} }
 @article{cadena_2011, title={Potential earliest record of podocnemidoid turtles from the early Cretaceous (Valanginian) of Colombia}, volume={85}, number={5}, journal={Journal of Paleontology}, author={Cadena, E. A.}, year={2011}, pages={877–881} }