FIRST RECORD OF SUPERNUMERARY TEETH IN GLYPTODONTIDAE (MAMMALIA, XENARTHRA, CINGULATA)

GONZÁLEZ-RUIZ, LAUREANO; CIANCIO, MARTÍN R.; MARTIN, G.; ZURITA, A. E.

JOURNAL OF VERTEBRATE PALEONTOLOGY

SOC VERTEBRATE PALEONTOLOGY

Lugar: Lawrence; Año: 2015 vol. 35 p. 1 - 6

0272-4634

The specimen under study corresponds to a skull of an adult of Boreostemma acostae from La Venta (Huila, Colombia), specifically from the Villavieja Formation, ?Monkey Unit? The ?Monkey Unit? is located at the base of Villavieja Formation (ca. 12.9?11.5 Ma) (middle Miocene) of the Honda Group. Most glyptodonts have eight trilobed and molariform teeth in each hemimaxilla and eight in each dentary (Mf 8/mf 8), none of them located in the premaxillary bone. In some taxa, the first two or three have a simpler morphology (i.e., not evidently lobed or trilobed) and the Mf1 have been called by several authors incisiforms though without implying homologies but function. The specimen described herein present an upper right dental series that is composed of nine well preserved Mf teeth. On the left dental series, the presence of eight Mfs is inferred by the preservation of the first four Mfs and the four alveoli of the last four Mfs.