Ontogeny and Sexual Dimorphism of Glyptotherium texanum (Xenarthra, Cingulata) from the Pliocene and Pleistocene (Blancan and Irvingtonian NALMA) of Arizona, New Mexico, and Mexico
Por:
Gillette, David D., Carranza-Castaneda, Oscar, White, Jr., Richard S., Morgan, Gary S., Thrasher, Larry C., McCord, Robert, McCullough, Gavin
Publicada:
1 jun 2016
Categoría:
Ecology, Evolution, Behavior and Systematics
Resumen:
North American glyptodonts originated from South American ancestors
during the Great American Biotic Interchange no later than early Blancan
North American Land Mammal Age (NALMA). A substantial expansion in
population samples from the late Blancan 111 Ranch fauna of southeastern
Arizona, several late Blancan faunas in New Mexico, and the early
Blancan-Irvingtonian faunas of Guanajuato, Mexico, permit, analysis of
sexual dimorphism and ontogeny of Glyptotherium texanum Osborn, 1903.
Growth of carapacial osteoderms was allometric, including changes of the
external sculpturing. Overall anatomy of the carapace changed with
growth, with development of distinctive pre-iliac and post-iliac regions
in lateral profile of adults. Skulls of adults possess a unique boss on
the anterior surface of the descending process of the zygomatic arch
that is not present in juveniles. Sexual dimorphism involves differences
in anatomy of lateral and posterior osteoderms. Glyptotherium arizonae
Gidley, 1926, is a junior synonym of G. texanum. The temporal
distribution of G. texanum extends from early Blancan NALMA to
Irvingtonian NALMA, with geographical distribution from Central America
and Mexico to southern United States.
Filiaciones:
Museum Northern Arizona, 3101 N Ft Valley Rd, Flagstaff, AZ 86001 USA
Univ Nacl Autonoma Mexico, Ctr Geociencias, Campus Juriquilla, Queretaro, Mexico
New Mexico Museum Nat Hist & Sci, 1801 Mt Rd NW, Albuquerque, NM 87104 USA
Bur Land Management, Safford, AZ 85546 USA
Arizona Museum Nat Hist, 53 North McDonald St, Mesa, AZ 85201 USA
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