New information on the protorosaurian reptile<i>Macrocnemus fuyuanensis</i>Li et al., 2007, from the Middle/Upper Triassic of Yunnan, China

Jiang, Da-Yong; Rieppel, Olivier; Fraser, Nicholas C.; Motani, Ryosuke; Hao, Wenyan; Tintori, Andrea; Sun, Yongqi; Sun, Zhipeng

doi:10.1080/02724634.2011.610853

Cited by 28 publications

(61 citation statements)

References 12 publications

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“…The anterior part of the skeleton (up to dorsal vertebra 10) is visible in right lateral view, whereas the posterior part has separated and rotated to be embedded mostly in ventral view. Other material used for comparison in this study included the more complete and overall articulated specimens PIMUZ T 4355 ( Figure 1D) from the same locality Tre Fontane and PIMUZ T 4822 ( Figure 1E) from the lower Ladinian Meride Limestone (Cassina beds), as well as data from the literature (e.g., Peyer, 1937;Premru, 1991;Li et al, 2007;Jiang et al, 2011). Comparison with the holotype PIMUZ A/III 1467 of M. obristi was limited, because of little overlap of the skeletal remains (Fraser and Furrer, 2013).…”

Section: Methodsmentioning

confidence: 99%

“…Additional diagnostic characters were mentioned in the initial description of the species ("tibia shorter than femur" and "17 or 18 dorsal vertebrae": Li et al, 2007Li et al, , p. 1602 in addition a more slender pes compared to the hand was noted based on measurements of metacarpals/-tarsals IV). A re-examination of the holotype specimen IVPP V15001 and a new, referred specimen GMPKU-P-3001, however, concluded that the humerus/radius (H/R) ratio was the only unequivocal feature characteristic of M. fuyuanensis (Jiang et al, 2011). The third species, Macrocnemus obristi, was described based on two fragmentary posterior postcranial remains from the lower Ladinian of the Prosanto Formation in the Canton Graubünden in south-eastern Switzerland (Fraser and Furrer, 2013).…”

Section: Introductionmentioning

confidence: 99%

“…Macrocnemus fuyuanensis was described based on fossil finds from the Ladinian of the Zhuganpo Member of the Falang Formation, Fuyuan County of Yunnan Province in southern China (Li et al, 2007;Jiang et al, 2011). It differs from M. bassanii in having a considerably longer (∼20%) humerus relative to the radius.…”

Section: Introductionmentioning

confidence: 99%

“…Among protorosaurs, Macrocnemus (Nopcsa, 1930), is a small lizard-like form restricted to the Middle Triassic (Anisian-Ladinian), but possibly extending into the Late Triassic (earliest Carnian; Jiang et al, 2011Jiang et al, , p. 1230. The first species of Macrocnemus to be described was Macrocnemus bassanii (Nopcsa, 1930) from the Besano Formation at the Anisian-Ladinian boundary and the Cassina beds of the Meride Limestone (early Ladinian) of Monte San Giorgio, Canton Ticino, southern Switzerland and Province Varese, northern Italy (Nopcsa, 1931;Peyer, 1937;Rieppel, 1989).…”

Section: Introductionmentioning

confidence: 99%

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Osteology of a New Specimen of Macrocnemus aff. M. fuyuanensis (Archosauromorpha, Protorosauria) from the Middle Triassic of Europe: Potential Implications for Species Recognition and Paleogeography of Tanystropheid Protorosaurs

et al. 2017

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Over the past two decades, a wealth of marine and terrestrial reptiles, including protorosaurian archosauromorphs, has been described from Triassic shales and limestone layers in southern China. Recovered from the eastern margin of the Tethys Ocean, these forms often show remarkable similarities to taxa that were previously known and described from Europe, i.e., the western Tethyan margin. One protorosaurian that is known from the western and the eastern Tethyan province is the genus Macrocnemus, with currently three recognized species: (1) Macrocnemus bassanii from the Middle Triassic Besano Formation and Meride Limestone (late Anisian-early Ladinian), UNESCO World Heritage Site Monte San Giorgio, Ticino, Switzerland; (2) Macrocnemus obristi from the Prosanto Formation (early Ladinian) of the Ducan area, Grisons, Switzerland; and (3) Macrocnemus fuyuanensis from the Falang Formation (Ladinian), Yunnan Province, southern China. Recently a new specimen, PIMUZ T 1559, from the upper Besano Formation at Meride, Ticino, Switzerland, was prepared, revealing a disarticulated skeleton which includes most of the cranium and lower jaw, pre-caudal vertebral column and ribs, the forelimbs, and girdle elements. Unambiguously assignable to the genus Macrocnemus, it evinces particularly gracile elongated cervical ribs, as well as a humerus/radius ratio that is comparable only to that of M. fuyuanensis from southern China. Based on this feature we tentatively recognize the new specimen as M. aff. fuyuanensis from Europe. The position and exquisite preservation of the clavicle and interclavicle in this specimen allows a revision of the shoulder girdle of Macrocnemus when articulated, which also has implications for closely related protorosaurian taxa, Jaquier et al.Osteology and Paleogeography of Macrocnemus such as the long-necked Tanystropheus. Furthermore, differences in the shape and morphology of the interclavicle including pointed wing-like lateral processes and a short, fusiform caudal process represent rare discrete characters that allow separation of the specimens of M. bassanii from the new specimen of M. aff. fuyuanensis.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Osteology of a New Specimen of Macrocnemus aff. M. fuyuanensis (Archosauromorpha, Protorosauria) from the Middle Triassic of Europe: Potential Implications for Species Recognition and Paleogeography of Tanystropheid Protorosaurs

et al. 2017

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“…Similarly low anterior cervical neural spines occur in Langobardisaurus pandolfii (MCSNB 2883), Macrocnemus fuyuanensis (MCSN V 457; Jiang et al, 2011), and Prolacerta broomi (UCMP 37151;Gow, 1975). In A. madagaskarensis, the anterior cervical neural spines are transversely compressed into thin blades, resembling those in Prolacerta broomi (UCMP 37151) and Trilophosaurus buettneri (TMM 31025-140).…”

Section: Description Axial Skeletonmentioning

confidence: 99%