AUSTROPEDIOMYS MARSHALLI GEN. ET SP NOV., A NEW PEDIOMYOIDEA (MAMMALIA, METATHERIA) FROM THE PALEOGENE OF BRAZIL: PALEOBIOGEOGRAPHIC IMPLICATIONS

被引:14
作者
Carneiro, Leonardo M. [1 ]
Oliveira, Edison V. [1 ]
Goin, Francisco J. [2 ,3 ]
机构
[1] Univ Fed Pernambuco, Lab Paleontol PALEOLAB, Dept Geol, Ctr Tecnol & Geociencias, Ave Acad Helio Ramos S-N, BR-50740530 Recife, PE, Brazil
[2] UNLP, MORPHOS Lab, CONICET, Fac Ciencias Nat & Museo La Plata, Paseo Bosque S-N,B1900FWA, La Plata, Buenos Aires, Argentina
[3] UNLP, Div Paleontol Vertebrados, CONICET, Fac Ciencias Nat & Museo La Plata, Paseo Bosque S-N,B1900FWA, La Plata, Buenos Aires, Argentina
来源
REVISTA BRASILEIRA DE PALEONTOLOGIA | 2018年 / 21卷 / 02期
关键词
Lower Eocene; Itaborai Basin; Pediomyoidea; systematics; NORTH-AMERICA; SOUTH-AMERICA; MARSUPIALS; EVOLUTION; AGE; REASSESSMENT; PALEOCENE; PHYLOGENY; DISPERSAL; BEARING;
D O I
10.4072/rbp.2018.2.03
中图分类号
Q91 [古生物学];
学科分类号
0709 ; 070903 ;
摘要
The Pediomyiodea has been largely regarded as a Late Cretaceous North American metatherian lineage; however, some studies have suggested that a few South American taxa could be related to this family. Herein, Austropediomys marshalli gen. et sp. nov. from the Itaborai Basin, Brazil (lower Eocene - Itaboraian SALMA), is described. Austropediomys gen. nov. represents the first report of a pediomyoid metatherian in the Paleogene of South America backed by a phylogenetic analysis. Several derived features in the upper molars support its belonging to the Pediomyoidea: presence of accessory cconular-like' structures (here named conuloids) lingual to the conules; supernumerary stylar cusps; asymmetric stylar shelf, with parastylar shelf reduced to a narrow rim in M1; straight centrocrista; short and obliquely oriented prepacrista, which contacts StA in M2-3. The presence of cconular-like' structures lingual to the paraconule and metaconule is identified in Austropediomys gen. nov. and in Late Cretaceous pediomyoids as well, and results in the phylogenetic analysis as a synapomorphy of the Pediomyoidea. Austropediomys gen. nov. is autapomorphyc in the presence of enlarged conuloids on protocristae. The record of a pediomyoid in the Paleogene of South America increases the temporal and biogeographical range of this lineage. Also, our results support the hypothesis that several non-related metatherian lineages dispersed from North to South America via the Caribbean Plate, most probably during the latest Cretaceous, in an island-hopping or sweepstakes model.
引用
收藏
页码:120 / 131
页数:12
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