The late Miocene radiation of Neotropical sigmodontine rodents in North America
Published:January 01, 1986
Jon Alan Baskin, 1986. "The late Miocene radiation of Neotropical sigmodontine rodents in North America", Vertebrates, Phylogeny, and Philosophy, Kathryn M. Flanagan, Jason A. Lillegraven
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Abelmoschomys simpsoni, n. gen. et sp., from the latest Clarendonian of Florida, is the earliest known species of Neotropical sigmodontine rodent. Neotropical sigmodontines initially evolved and diversified in North America in the late Miocene. This group is derived from the North American genus Copemys, and forms the sister group of the peromyscines. The Neotropical sigmodontines entered South America in the Pliocene at about the time of formation of the Panamanian land bridge. This hypothesis is supported by evidence from physiology, karyology, molecular systematics, comparative anatomy, and paleontology, and is not contradicted by parasite data. The present day diversity of sigmodontines in South America is that expected for its continental area. Taxonomic frequency rates necessary to produce the more than 200 species of South American sigmodontines as determined by the geometric growth equation range between 0.68 and 0.82 per million years. Although these rates are higher than those previously reported for Cenozoic mammals, they are comparable to rates for other muroid radiations. These high rates may account for discrepancies between divergence times calculated by the molecular clock versus the fossil record.
“Is it of any interest to anyone but a mouse fancier? (The answer is yes.)”George Gaylord Simpson (1980, p. 196)
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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.