Early Eocene artiodactyls from the San Juan Basin, New Mexico, and the Piceance Basin, Colorado
Published:January 01, 1986
Leonard Krishtalka, Richard K. Stucky, 1986. "Early Eocene artiodactyls from the San Juan Basin, New Mexico, and the Piceance Basin, Colorado", Vertebrates, Phylogeny, and Philosophy, Kathryn M. Flanagan, Jason A. Lillegraven
Download citation file:
Three species of artiodactyls (Diacodexis sp. cf. D. secans, Simpsonodus chacensis [new genus and species], and Wasatchia grangeri) are reported from the San Jose Formation, New Mexico; these three and an additional four taxa (Simpsonodus sp., W. pattersoni, Bunophorus sinclairi, and Hexacodus pelodes) occur in the Debeque Formation, Colorado. The new diacodexeid genus, Simpsonodus, includes D. chacensis and W. lysitensis. Wasatchia pattersoni, new species, the most derived known species of Wasatchia, is morphologically suitable as an ancestor to Bunophorus, with which it overlaps stratigraphically. Diacodexis sp. cf. D. secans is morphologically and apparently phylogenetically intermediate between D. secans, on the one hand, and Hexacodus and Antiacodon on the other. The early Eocene record of diacodexeids is robust enough to indicate: (1) the gradual and continuous divergence of D. secans and Diacodexis sp. cf. D. secans in the mosaic distribution of derived character states; and (2) from these taxa, respectively, the gradational origin of other diacodexeids/leptochoerids and antiacodontids/homacodontids. In these instances, microevolutionary processes appear to account for the macroevolutionary pattern.
Figures & Tables
Vertebrates, Phylogeny, and Philosophy
Dr. George Gaylord Simpson, one of the most important evolutionary biologists of the Twentieth Century, was born on June 16, 1902 and died on October 6, 1984. His contributions to science include not only a modern synthesis of evolutionary thought, but original research on anthropology, mammalogy, paleontology, general biology, and statistics. His prolific writings were intended for scientific and non—scientific communities alike. He helped and encouraged many who now work in the fields of paleontology and evolutionary biology. Contributors to this book dedicate their efforts as tribute to his memory.
Included authors are colleagues, former students, and friends of Dr. Simpson’s. They represent but a few of the people he would have included in these categories. The book is intended to suggest only a sampling of the diversity of George Gaylord Simpson's impact on present vertebrate paleontology, from its most senior to its very junior participants.
Ms. Flanagan’s letter of invitation entreated the following from potential authors: "In the spirit of Dr. Simpson’s own writings, we encourage imaginative contributions that would be just a little different from items expected in a regular scientific journal." The title of the volume (Vertebrates, Phylogeny, and Philosophy) reflects that request. Though individual articles deal almost exclusively with fossil mammals, emphases cross the spectrum of evolutionary biology, including systematic paleontology, considerations of adaptation, ontogeny, analyses of evolutionary tem— po and mode, biogeographic procedure, and paleogeography. Philip Gingerich’s contribution stresses the crucial importance of solid empirical research to the foundations upon which theoretical/philosophical writings should be based. Mesozoic and Cenozoic taxa are considered, and two articles discuss the modern union of molecular biology, genetics, and paleontology. Most articles benefited directly from the pioneering writings of George Simpson, yet the breadth of concerns of this volume covers only a small fraction of the interests exhibited in his lifetime of evolutionary research.
Kathryn Flanagan served as principal correspondent with authors and reviewers. Jason Lillegraven had principal responsibility for manuscript editing and considerations of production.
We take this opportunity to thank the thirty-two authors for their contributions. Similarly, more than fifty individuals served as unpaid reviewers, and we give our most sincere thanks for their generosity of time and effort. Also, we thank Linda E. Lillegraven for creating the cover design.