Early cretaceous mammals of Western Siberia: 3. Zhangheotheriidae

Лопатин, А. В.; Averianov, A. O.; Maschenko, E. N.; Leshchinskiy, Sergey V.

doi:10.1134/s0031030110050138

Cited by 20 publications

(21 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, molars are by definition never replaced37, and this fifth postcanine should be identified as the P5. Contrary to the original interpretation, it is likely that both maxillae referred to Kiyatherium bear the entire molar series, with the M3 more reduced in size in the holotype specimen28. Though damaged, it is clear that the P5 of the referred specimen is less worn than the M1 and belongs to a different tooth generation.…”

Section: Resultsmentioning

confidence: 77%

See 1 more Smart Citation

A new symmetrodont mammal (Trechnotheria: Zhangheotheriidae) from the Early Cretaceous of China and trechnotherian character evolution

Zheng²,

Meng

et al. 2016

Sci Rep

View full text Add to dashboard Cite

We report the discovery of Anebodon luoi, a new genus and species of zhangheotheriid symmetrodont mammal from the Lujiatun site of the Lower Cretaceous Yixian Formation, China. The fossil is represented by an associated partial skull and dentaries with a nearly complete dentition, and with a dental formula of I4/3 C1/1 P5/4 M3/4. This new taxon lacks the high molar count typical of derived symmetrodonts, differing from the well-represented zhangheotheriids Zhangheotherium and Maotherium in having a postcanine dental formula that resembles more primitive tinodontid symmetrodonts on the one hand, and sister taxa to therians such as Peramus on the other. Upper and lower distal premolars are strongly molariform and are captured undergoing replacement, clarifying positional homology among related taxa. We also describe the rostrum and, for the first time in a symmetrodont, much of the orbital mosaic. Importantly, our new taxon occupies a basal position within the Zhangheotheriidae and permits discussion of trechnotherian character evolution, ultimately shedding additional light on the evolution of therians.

show abstract

Section: Resultsmentioning

confidence: 77%

“…Despite limited taxonomic diversity, zhangheotheriids are known by relatively well-preserved material including partial skulls and nearly complete skeletons2324252628. The known record of this group is restricted to the Early Cretaceous of China and Siberia.…”

Section: Discussionmentioning

confidence: 99%

A new symmetrodont mammal (Trechnotheria: Zhangheotheriidae) from the Early Cretaceous of China and trechnotherian character evolution

Zheng²,

Meng

et al. 2016

Sci Rep

View full text Add to dashboard Cite

show abstract

“…This has been observed in some mammaliaforms (Crompton & Luo 1993) and has recently been documented for the tinodontids Yermackia and Gobiotheriodon (Averianov 2002;Lopatin et al 2005;Averianov & Lopatin 2008). It was hypothesized that this difference in the orientation of wear facets in upper and lower molariforms can be accommodated by rotation of the lower jaw and its teeth during occlusion (Crompton & Luo 1993), especially in those taxa with embrasure occlusion.…”

Section: Discussion (A) Morphologymentioning

confidence: 99%

“…(b) Palaeobiogeography The geographical distribution of Early Cretaceous mammals from East Asia has expanded in the last 20 years with new findings from Russia (Averianov et al 2005;Lopatin et al 2005), Japan (e.g. Tsubamoto et al 2004;Kusuhashi 2008), Korea and China (e.g.…”

mentioning

confidence: 99%

A new mammal skull from the Lower Cretaceous of China with implications for the evolution of obtuse-angled molars and ‘amphilestid’ eutriconodonts

Gao¹,

Wilson

Luo

et al. 2009

Proc. R. Soc. B.

View full text Add to dashboard Cite

We report the discovery of Juchilestes liaoningensis, a new genus and species of eutriconodont mammal from the Lujiatun Site of the Lower Cretaceous Yixian Formation (123.2 + 1.0 Ma; Lower Aptian). The holotype preserves a partial skull and full dentition. Among eutriconodonts, its lower dentition is similar to taxa formerly assigned to the paraphyletic group of 'amphilestids'. Some have considered 'amphilestid' molars to represent the structural intermediate between the lower molars of the 'triconodont' pattern of cusps in alignment and the fully triangulate and more derived therian molars. However, 'amphilestid' taxa were previously represented only by the lower dentition. Our study reveals, for the first time, the upper dentition and skull structure of an 'amphilestid', and shows that at least some eutriconodonts have an obtuse-angled cusp pattern on molars in middle positions of the long molar series. Its petrosal is similar to those of other eutriconodonts and spalacotheroid 'symmetrodonts'. Our phylogenetic analyses suggest that (i) Juchilestes is most closely related to the Early Cretaceous Hakusanodon from Japan, in the same Eastern Asiatic geographic region; (ii) 'amphilestids' are not monophyletic; and (iii) eutriconodonts might not be a monophyletic group, although this hypothesis must be further tested.

show abstract

“…The Lower Cretaceous Ilek Formation, widely distributed in Western Siberia, Russia (Fig. 1), recently yielded an important vertebrate fauna, including fishes, amphibians, squamates, choristoderes, crocodyliforms, pterosaurs, various dinosaurs, birds, tritylodontids, and mammals (Maschenko and Lopatin 1998;Alifanov et al 1999;Tatarinov and Maschenko 1999;Averianov and Voronkevich 2002;Maschenko et al 2003;Averianov et al 2005Averianov et al , 2017Averianov et al , 2018Lopatin et al 2005Lopatin et al , 2009Lopatin et al , 2010aKurochkin et al 2011;O'Connor et al 2014;Skutschas 2014Skutschas , 2016Vitenko 2015, 2017;. Dinosaurs are represented by fragmentary remains of a titanosauriform sauropod Sibirotitan astrosacralis, theropods, stegosaurs, and ornithopods, as well as by several complete and well-preserved skeletons of the basal ceratopsian Psittacosaurus sibiricus from the Shestakovo 3 locality (Averianov et al 2006(Averianov et al , 2018Lopatin et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Theropod teeth from the Lower Cretaceous Ilek Formation of Western Siberia, Russia

2019

View full text Add to dashboard Cite

A sample of 136 isolated theropod teeth from nine vertebrate localities within the Lower Cretaceous (Barremian-Aptian) Ilek Formation in West Siberia, Russia, can be separated into five dental morphotypes referred to five or six theropod taxa based on morphological characters. The Morphotype A includes small to large lateral teeth with relatively large distal denticles and smaller mesial denticles. Some of these teeth can be attributed to the Dromaeosauridae, while other teeth may belong to a basal member of the Tyrannosauroidea. The distinctly smaller lateral teeth referred to the Morphotype B are similar with Morphotype A in most respects but differ in the lack of mesial denticles and mesial carina, or having a lingually displaced mesial carina. These teeth may belong to juvenile individuals of the same dromaeosaurid taxon. The teeth belonging to Morphotype C also lack mesial denticles and differ from Morphotype B by a flattened area on the lingual side, which is also often present on the labial side. These teeth may belong to either Troodontidae or Microraptorinae, or to both groups. The mesial and lateral teeth of Morphotype E are characterized by unserrated mesial and distal carinae. These teeth most likely belong to a distinct taxon of Troodontidae with unserrated dentition. The teeth of the Morphotype D include mesial teeth with the mesial carina displaced lingually at various extent and denticles present on both carinae. The teeth with moderately displaced lingual carina can be referred to the same dromaeosaurid taxon, which lateral teeth represented by Morphotype A. The teeth with more displaced mesial carina and deeply U-shaped basal crown section belong to an indeterminate Tyrannosauroidea.

show abstract

Early cretaceous mammals of Western Siberia: 3. Zhangheotheriidae

Cited by 20 publications

References 16 publications

A new symmetrodont mammal (Trechnotheria: Zhangheotheriidae) from the Early Cretaceous of China and trechnotherian character evolution

A new symmetrodont mammal (Trechnotheria: Zhangheotheriidae) from the Early Cretaceous of China and trechnotherian character evolution

A new mammal skull from the Lower Cretaceous of China with implications for the evolution of obtuse-angled molars and ‘amphilestid’ eutriconodonts

Theropod teeth from the Lower Cretaceous Ilek Formation of Western Siberia, Russia

Contact Info

Product

Resources

About