New remains of Glyptodontidae (Mammalia, Xenarthra) from the Salicas Formation (late Miocene, Messinian), La Rioja Province, Argentina. (January 2021)

• Record Type: Journal Article
• Authors: Brandoni, Diego; González Ruiz, Laureano R.
• Is Part Of: Journal of South American earth sciences. Volume 105(2021)
• Publication Date: 2021-01
• Subjects: Stromaphorus compressidens -- Eosclerocalyptus proximus -- Nopachtus coagmentatus -- Osteoderms -- Tortonian -- Zanclean; Geology -- Latin America -- Periodicals; Earth sciences -- Latin America -- Periodicals; Geology -- Antarctica -- Periodicals; Earth sciences -- Antarctica -- Periodicals; Geology -- Caribbean Area -- Periodicals; Earth sciences -- Caribbean Area -- Periodicals; Géologie -- Amérique latine -- Périodiques; Sciences de la terre -- Amérique latine -- Périodiques; Géologie -- Antarctique -- Périodiques; Sciences de la terre -- Antarctique -- Périodiques; Géologie -- Caraïbes (Région) -- Périodiques; Sciences de la terre -- Caraïbes (Région) -- Périodiques; Earth sciences; Geology; Antarctica; Caribbean Area; Latin America; Periodicals; 550.5
• DOI: 10.1016/j.jsames.2020.102952
• Languages: English
• ISSNs: 0895-9811

Abstract

Abstract: In South America, glyptodonts are recorded since the late Eocene to the early Holocene. Their fossil record is represented mainly by disarticulated osteoderms during the Eocene and Oligocene, whereas more complete skeletons appeared since the early Miocene. The characters from the dorsal surface of the osteoderms (e.g., figures, foramina, sulci) are used for systematic recognition and phylogenetical relationships of Glyptodontidae. The aim of this contribution is to analyze a new collection of glyptodontid osteoderms from the Salicas Formation (late Miocene) at La Rioja Province, Argentina. The glyptodontids osteoderms herein presented are assigned to 1) Stromaphorus compressidens (CRILAR-Pv 113 and CRILAR-Pv 114) given the osteoderms have a central figure surrounded by a first row of 12–14 peripheral figures and, by a not always a complete second row of peripheral figures; and 2) Eosclerocalyptus cf. proximus (CRILAR-Pv 115) given the osteoderms have a circular to subelliptical central figure surrounded by a first row of 10 peripheral figures and by some peripheral figures located on a second row. The record of S. compressidens from Salicas Formation herein presented constitutes the first record of the species for the late Neogene of La Rioja Province; whereas the record of E. cf. proximus corroborates the presence of the genus in the Salicas Formation. The mammal assemblage recorded at the El Degolladito area suggests a latest Miocene age (Messinian) for the Salicas Formation at this locality. Highlights: A new collection of glyptodontid osteoderms from the Salicas Formation is described. Specimens CRILAR-Pv 113 and CRILAR-Pv 114 are assigned to Stromaphorus compressidens. Specimen CRILAR-Pv 115 is assigned to Eosclerocalyptus cf. proximus. Stromaphorus compressidens from Salicas Formation constitutes the first record of the species for La Rioja Province. The record of E. cf. proximus corroborates the presence of the genus in the Salicas Formation.