Cretaceous Trionychids of Asia: An Expanded Review of Their Record and Biogeography

Danilov, Igor G.; Vitek, Natasha

doi:10.1007/978-94-007-4309-0_23

Cited by 18 publications

(27 citation statements)

References 23 publications

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“…The phylogenetic relationships among modern soft-shelled turtle species are still controversial, but it is generally accepted that Trionychidae consists of two clades, Cyclanorbinae and Trionychinae, and that Trionychinae includes some well-supported monophyletic clades (Meylan, 1987;Engstrom et al, 2004). The taxonomy and phylogenetic relationships of fossil trionychid species are far more controversial, and very little is known regarding the origin and early radiation of this group (Gardner et al, 1995;Joyce andLyson, 2010, 2011;Vitek and Danilov, 2010;Vitek, 2012;Danilov and Vitek, 2013;Joyce et al, 2013). The early record of soft-shelled turtles is poor, and most taxa are based either on fragmentary shells or skulls (Yeh, 1994;Hutchison, 2000;Sukhanov, 2000;Danilov and Vitek, 2013).…”

Section: Introductionmentioning

confidence: 99%

“…The taxonomy and phylogenetic relationships of fossil trionychid species are far more controversial, and very little is known regarding the origin and early radiation of this group (Gardner et al, 1995;Joyce andLyson, 2010, 2011;Vitek and Danilov, 2010;Vitek, 2012;Danilov and Vitek, 2013;Joyce et al, 2013). The early record of soft-shelled turtles is poor, and most taxa are based either on fragmentary shells or skulls (Yeh, 1994;Hutchison, 2000;Sukhanov, 2000;Danilov and Vitek, 2013). More complete Mesozoic skull-shell-associated materials have been described only for trionychids from the Campanian and Maastrichtian of North America (Gardner et al, 1995;Brinkman, 2005;Joyce and Lyson, 2011;Vitek, 2012) or the Cenomanian-Santonian of Mongolia (Danilov et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

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The first soft-shelled turtle from the Jehol Biota of China

Joyce²,

Liu

2015

Journal of Vertebrate Paleontology

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ABSTRACT-A new turtle from the Early Cretaceous (Aptian) Jiufotang Formation of western Liaoning, China, Perochelys lamadongensis, gen. et sp. nov., represents the first species of soft-shelled turtle from the Jehol Biota. The new taxon is diagnosed by the combination of the following characters: nuchal bone about five times wider than long; preneural absent; reversal of the orientation in the neural series at neural V; neural series fully separates costal series; costal VIIIs reduced; plastral callosities poorly developed and poorly sculpted; postorbital bar narrow, around one-fourth of orbit diameter; jugal contacting squamosal; foramen jugulare posterius separated from fenestra postotica; neural spines weakly developed on anterior cervicals; and phalangeal formula for pes 2-3-3-4-?. High levels of homoplasy make the phylogenetic relationships of the new taxon difficult to assess, and the possibility therefore exists that Perochelys lamadongensis either represents a stem or a crown trionychid. This phylogenetic uncertainty confirms that the skeletal morphology of trionychids has remained virtually unchanged for the last 120 million years.http://zoobank.org/urn:lsid:zoobank

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The first soft-shelled turtle from the Jehol Biota of China

Joyce²,

Liu

2015

Journal of Vertebrate Paleontology

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“…This paper continues a series of publications on Cretaceous trionychids of Asia (Danilov and Vitek, 2009;Vitek andDanilov, 2010, 2012;Danilov and Vitek, 2012) and is devoted to trionychids from the Late Cretaceous (late Turonian) Bissekty Formation of the Dzharakuduk (Dzharakuduk II; Nessov, 1997) locality in Uzbekistan ( Fig. 1; see Vitek and Danilov (2010) for more details about geography).…”

Section: Introductionmentioning

confidence: 65%

Soft-shelled turtles (Trionychidae) from the Bissekty Formation (Late Cretaceous: late Turonian) of Uzbekistan: Shell-based taxa

Danilov

Vitek

2013

Cretaceous Research

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a b s t r a c tIn this paper we describe previously unpublished trionychid turtle material, consisting of numerous shell fragments, from the Late Cretaceous (late Turonian) Bissekty Formation of the Dzharakuduk locality in Uzbekistan. This material is assigned to two shell-based taxa: Aspideretoides cf. riabinini and "Trionyx" cf. kansaiensis. The material which cannot be confidently attributed to these two taxa is identified as Trionychidae indet. In addition to these shell-based trionychid taxa, the Dzharakuduk turtle assemblage includes two skull-based taxa of trionychids (Khunnuchelys kizylkumensis and Trionychini indet.). The trionychids from the Bissekty Formation are most similar to trionychids from the younger (Santonian e early Campanian) Bostobe Formation of Kazakhstan, represented by three shell-based taxa (Aspideretoides riabinini, Paleotrionyx riabinini and "Trionyx" kansaiensis), and one skull-based taxon (Khunnuchelys sp.). We provide an improved understanding of the subtle similarities and differences between four closely related Cretaceous turtle assemblages of Middle Asia and Kazakhstan.

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“…This paper continues a series of publications on Cretaceous trionychids of Asia (Danilov and Vitek, 2009;Vitek and Danilov, 2010Danilov andVitek, 2012, 2013) and is devoted to trionychids from the early Late Cretaceous (Cenomanian) of Uzbekistan, situated in the region called Middle Asia and Kazakhstan ( Fig. 1; see Vitek and Danilov [2010] for more details about the geography of Middle Asia and Kazakhstan).…”

Section: Introductionmentioning

confidence: 67%

“…1 for map). Data about the composition of assemblages are taken from the following publications: Nessov (1997); Vitek and Danilov (2010); Danilov et al (2011);Danilov and Vitek (2012); Vitek and Danilov (2012 …”

Section: Discussionmentioning

confidence: 99%

Soft-shelled turtles (Trionychidae) from the Cenomanian of Uzbekistan

Vitek

Danilov

2014

Cretaceous Research

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a b s t r a c tLocalities from the Cenomanian of Uzbekistan are the oldest in Middle Asia and Kazakhstan to preserve two broadly sympatric species of trionychid turtle. Material described here comes from multiple Cenomanian formations from the Itemir locality, and from multiple localities in the Cenomanian Khodzhakul Formation. The first taxon from the locality, "Trionyx" cf. kyrgyzensis, has multiple morphological similarities with the older, Early Cretaceous "Trionyx" kyrgyzensis. In contrast, the second taxon, "Trionyx" dissolutus, has multiple similarities with "Trionyx" kansaiensis, one of two species of trionychid found in younger Late Cretaceous localities. "Trionyx" dissolutus bears some superficial resemblance to other trionychid taxa within the clade Plastomenidae because of its highly ossified plastron with a hyoplastral lappet and an epiplastral notch. However, Plastomenidae is diagnosed primarily through characters that are absent or cannot be observed in the available material of "T." dissolutus, and other shared features are plesiomorphic. In addition, "T." dissolutus shares other synapomorphies with Trionychinae. A heavily ossified plastron may be more homoplastric within Trionychidae than has been previously recognized. Finally, we provide an improved understanding of the subtle similarities and differences between several closely related Cretaceous turtle assemblages of Middle Asia and Kazakhstan.

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Cretaceous Trionychids of Asia: An Expanded Review of Their Record and Biogeography

Abstract: This chapter presents an expanded review of all described and/or figured specimens and taxa of trionychids from the Cretaceous (Barremian to Maastrichtian) of Asia.

Cited by 18 publications

References 23 publications

The first soft-shelled turtle from the Jehol Biota of China

The first soft-shelled turtle from the Jehol Biota of China

Soft-shelled turtles (Trionychidae) from the Bissekty Formation (Late Cretaceous: late Turonian) of Uzbekistan: Shell-based taxa

Soft-shelled turtles (Trionychidae) from the Cenomanian of Uzbekistan

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