Paraphyly in Catopsalis (Mammalia: Multituberculata) and its biogeographic implications
Published:January 01, 1986
Nancy B. Simmons, Miao Desui, 1986. "Paraphyly in Catopsalis (Mammalia: Multituberculata) and its biogeographic implications", Vertebrates, Phylogeny, and Philosophy, Kathryn M. Flanagan, Jason A. Lillegraven
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The genus Catopsalis Cope includes eight species (C. matthewi, C. catopsaloides, C. joyneri, C. alexanderi, C. foliatus, C. utahensis, C. fissidens, C. calgariensis) spanning Late Cretaceous through late Paleocene/early Eocene time on two continents, Asia (first two taxa) and North America (last six taxa). A cladistic analysis of dental and palatal features within the Taeniolabididae (which includes Catopsalis, Kamptobaatar, Lambdopsalis, Prionessus, Sphenopsalis, and Taeniolabis) indicates that Catopsalis is a paraphyletic taxon, composed of no fewer than five independent monophyletic groups. Taeniolabis is a monophyletic taxon, and Lambdopsalis, Prionessus, and Sphenopsalis (individually monophyletic by monotypy) together form another monophyletic group. These two clades appear to have evolved from ancestors within the paraphyletic taxon Catopsalis; accordingly, the smallest monophyletic group including all Catopsalis species also includes Taeniolabis, Lambdopsalis, Prionessus, and Sphenopsalis. C. matthewi, the most primitive member of this clade, is returned to Djadochtatherium Simpson, previously considered a junior subjective synonym of Catopsalis. The relationships demonstrated among various members of the Taeniolabididae support the hypothesis of a Late Cretaceous taeniolabidid dispersal from Asia to North America. The data additionally suggest a second dispersal event, probably in the middle to late Paleocene, in which the ancestors of the Lambdopsalis/ Prionessus/Sphenopsalis lineage dispersed from North America back to Asia.
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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.