A Middle Triassic pachypleurosaur (Diapsida: Eosauropterygia) from a restricted carbonate ramp in the Western Carpathians (Gutenstein Formation, Fatric Unit): paleogeographic implications

被引:10
作者
Cernansky, Andrej [1 ]
Klein, Nicole [2 ]
Sotak, Jan [3 ,4 ]
Olsavsky, Mario [5 ]
Surka, Juraj [3 ]
Herich, Pavel [6 ,7 ]
机构
[1] Comenius Univ, Fac Nat Sci, Dept Ecol, Bratislava 84215, Slovakia
[2] Univ Bonn, Div Paleontol, Steinmann Inst, Nussallee 8, D-53115 Bonn, Germany
[3] Slovak Acad Sci, Earth Sci Inst, Dumbierska 1, Banska Bystrica 97401, Slovakia
[4] KU Ruzomberok, Fac Educ, Dept Geog, Hrabovska Cesta 1, Ruzomberok 03401, Slovakia
[5] State Geol Inst Dionyz Stur, Lazovna 10, Banska Bystrica 97401, Slovakia
[6] Demanovska Dolina Valley Caving Club, Plostin 91, Liptovsky Mikulas 03101, Slovakia
[7] Slovak Caves Adm, Hodzova 11, Liptovsky Mikulas 03101, Slovakia
关键词
Reptilia; osteology; Gutenstein Limestone; Low Tatra Mountains; Mesozoic; KEICHOUSAURUS-HUI REPTILIA; MONTE SAN GIORGIO; SEXUAL-DIMORPHISM; SAUROPTERYGIA; INFORMATION; INSIGHTS; GUIZHOU; EXAMPLE; HUNGARY; LIFE;
D O I
10.1515/geoca-2018-0001
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
An eosauropterygian skeleton found in the Middle Triassic (upper Anisian) Gutenstein Formation of the Fatric Unit (Demanovska dolina Valley, Low Tatra Mountains, Slovakia) represents the earliest known occurrence of marine tetrapods in the Western Carpathians. The specimen represents a partly articulated portion of the postcranial skeleton (nine dorsal vertebrae, coracoid, ribs, gastral ribs, pelvic girdle, femur and one zeugopodial element). It is assigned to the Pachypleurosauria, more precisely to the Serpianosaurus-Neusticosaurus clade based on the following combination of features: (1) small body size; (2) morphology of vertebrae, ribs and femur; (3) tripartite gastral ribs; and (4) microanatomy of the femur as revealed by mu CT. Members of this clade were described from the epicontinental Germanic Basin and the Alpine Triassic (now southern Germany, Switzerland, Italy), and possibly from Spain. This finding shows that pachypleurosaur reptiles attained a broader geographical distribution during the Middle Triassic, with their geographical range reaching to the Central Western Carpathians. Pachypleurosaurs are often found in sediments formed in shallow, hypersaline carbonate-platform environments. The specimen found here occurs in a succession with vermicular limestones in a shallow subtidal zone and stromatolitic limestones in a peritidal zone, indicating that pachypleurosaurs -inhabited hypersaline, restricted carbonate ramps in the Western Carpathians.
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页码:3 / 16
页数:14
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