New data on Silurian vertebrates of southern Siberia

Сенников, Н В; Rodina, O; Изох, Н Г; Обут, О Т

doi:10.1016/j.palwor.2015.02.001

Cited by 5 publications

(7 citation statements)

References 11 publications

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“…sp. specimens have been reported ( Sennikov et al , 2015 ) from the Aeronian (Middle Llandovery) Sadra section (Gornaya Shoriya, Altai Republic, Russia) and the Sheinwoodian (Lower Wenlock) Upper Tarkhata Subformation (Charygka horizon, Gorny Altai, Altai Republic, Russia) and Baytal Formation (Pichishui Horizon, Tuva Republic, Russia).…”

Section: Resultsmentioning

confidence: 99%

“…The first erected species, Mongolepis rozmanae , was subsequently added to with the description of Teslepis jucunda Karatajūtė-Talimaa & Novitskaya ( 1992 ) and Sodolepis lucens Karatajūtė-Talimaa & Novitskaya ( 1997 ), also from the Chargat Formation. Recently the stratigraphic ranges of Mongolepis and Teslepis have been extended to include Aeronian (Middle Llandovery) and Sheinwoodian (Lower Wenlock) sedimentary sequences from Altai and Tuva ( Sennikov et al , 2015 ). Shiqianolepis hollandi from the Xiushan Formation (Telychian) of south China was also placed within the Order by Sansom, Aldridge & Smith ( 2000 ), although a new Family, the Shiqianolepidae, was erected based upon an interpretation of the scale growth patterns within mongolepids.…”

Section: Introductionmentioning

confidence: 99%

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The systematics of the Mongolepidida (Chondrichthyes) and the Ordovician origins of the clade

Andreev

Coates

Karatajūtē-Talimaa

et al. 2016

PeerJ

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The Mongolepidida is an Order of putative early chondrichthyan fish, originally erected to unite taxa from the Lower Silurian of Mongolia. The present study reassesses mongolepid systematics through the examination of the developmental, histological and morphological characteristics of scale-based specimens from the Upper Ordovician Harding Sandstone (Colorado, USA) and the Upper Llandovery–Lower Wenlock Yimugantawu (Tarim Basin, China), Xiushan (Guizhou Province, China) and Chargat (north-western Mongolia) Formations. The inclusion of the Mongolepidida within the Class Chondrichthyes is supported on the basis of a suite of scale attributes (areal odontode deposition, linear odontocomplex structure and lack of enamel, cancellous bone and hard-tissue resorption) shared with traditionally recognized chondrichthyans (euchondrichthyans, e.g., ctenacanthiforms). The mongolepid dermal skeleton exhibits a rare type of atubular dentine (lamellin) that is regarded as one of the diagnostic features of the Order within crown gnathostomes. The previously erected Mongolepididae and Shiqianolepidae families are revised, differentiated by scale-base histology and expanded to include the genera Rongolepisand Xinjiangichthys, respectively. A newly described mongolepid species (Solinalepis levis gen. et sp. nov.) from the Ordovician of North America is treated as family incertae sedis, as it possesses a type of basal bone tissue (acellular and vascular) that has yet to be documented in other mongolepids. This study extends the stratigraphic and palaeogeographic range of Mongolepidida and adds further evidence for an early diversification of the Chondrichthyes in the Ordovician Period, 50 million years prior to the first recorded appearance of euchondrichthyan teeth in the Lower Devonian.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The systematics of the Mongolepidida (Chondrichthyes) and the Ordovician origins of the clade

Andreev

Coates

Karatajūtē-Talimaa

et al. 2016

PeerJ

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“…The K-feldspar 40 Ar/ 39 Ar age of sample 3741-2 from the gabbro intruded Cambrian volcanic rocks is early Silurian (432.3 ± 13.2 Ma) as shown by a plateau of six steps (93% Ar*). In the Early Silurian, geological data indicates the existence of a regional passive margin basin with carbonate-terrigenous sedimentation and wide distribution of brachiopods and bryozoans [59]. The Silurian sedimentation history suggests a passive margin at this time, and therefore, the obtained 40 Ar/ 39 Ar age represents steady cooling post-emplacement.…”

Section: Groupmentioning

confidence: 88%

Tectonic History of the South Tannuol Fault Zone (Tuva Region of the Northern Central Asian Orogenic Belt, Russia): Constraints from Multi-Method Geochronology

et al. 2020

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In this study, we present zircon U/Pb, plagioclase and K-feldspar 40Ar/39Ar and apatite fission track (AFT) data along the South Tannuol Fault Zone (STFZ). Integrating geochronology and multi-method thermochronology places constraints on the formation and subsequent reactivation of the STFZ. Cambrian (~510 Ma) zircon U/Pb ages obtained for felsic volcanic rocks date the final stage of STFZ basement formation. Ordovician (~460–450 Ma) zircon U/Pb ages were obtained for felsic rocks along the structure, dating their emplacement and marking post-formational local magmatic activity along the STFZ. 40Ar/39Ar stepwise heating plateau-ages (~410–400 Ma, ~365 and ~340 Ma) reveal Early Devonian and Late Devonian–Mississippian intrusion and/or post-magmatic cooling episodes of mafic rocks in the basement. Permian (~290 Ma) zircon U/Pb age of mafic rocks documents for the first time Permian magmatism in the study area creating prerequisites for revising the spread of Permian large igneous provinces of Central Asia. The AFT dating and Thermal history modeling based on the AFT data reveals two intracontinental tectonic reactivation episodes of the STFZ: (1) a period of Cretaceous–Eocene (~100–40 Ma) reactivation and (2) the late Neogene (from ~10 Ma onwards) impulse after a period of tectonic stability during the Eocene–Miocene (~40–10 Ma).

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“…The Xinjiang taxa described here expand the Mongolepidida to eleven formally described genera, adding to records from North America, Mongolia and South China [3,5,7,18,49,56,57] ( Fig 10). The mongolepids are the most widely distributed (in stratigraphic and palaeogeographic senses) scale-based components of the earliest chondrichthyan faunas, with microvertebrate assemblages from the Siberian Platform hinting that their diversity in the Silurian (Llandovery-Wenlock) might be greater than currently recognised [19,58]. The material from the Tataertag and Ymogantau Formations has extended the overlap between the Tarim and South China constituents of the Zhangjiajie Vertebrate Fauna.…”

Section: Discussionmentioning

confidence: 99%

“…This has prompted some authors to suggest grouping together mongolepids and sinacanthids on the basis of shared atubular dentine and the absence of other associated chondrichthyan-like remains [60]. The presence of mongolepid scales in other sinacanthid-bearing Formations (such as the Rongxi and Fentou from South China) is yet to be determined as these have not been sampled for microremains [2,8], and the abundance of associated sinacanthid fossils is not a feature of Mongolian and North American mongolepid assemblages [18,57,58]. In the absence of definitive proof for a co-association of mongolepid scales and sinacanthid spines, the discovery of Yuanolepis gen. nov. has bearing on the affinities of the Mongolepidida and their relationship to the Sinacanthidae.…”

Section: Discussionmentioning

confidence: 99%

Early Silurian chondrichthyans from the Tarim Basin (Xinjiang, China)

et al. 2020

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The Sinacanthida ordo nov. and Mongolepidida are spine-and scale-based taxa whose remains encompass some of the earliest reported fossils of chondrichthyan fish. Investigation of fragmentary material from the Early Silurian Tataertag and Ymogantau Formations of the Tarim Basin (Xinjiang Uygur Autonomous Region, China) has revealed a diverse mongolepidid and sinacanthid fauna dominated by mongolepids and sinacanthids in association with abundant dermoskeletal elements of the endemic 'armoured' agnathans known as galeaspids. Micro-computed tomography, scanning electron microscopy and histological sections were used to identify seven mongolepid genera (including Tielikewatielepis sinensis gen. et sp. nov., Xiaohaizilepis liui gen. et sp. nov. and Taklamakanolepis asiaticus gen. et sp. nov.) together with a new chondrichthyan (Yuanolepis bachunensis gen. et sp. nov.) with scale crowns consisting of a mongolepid-type atubular dentine (lamellin). Unlike the more elaborate crown architecture of mongolepids, Yuanolepis gen. nov. exhibits a single row of crown elements consistent with the condition reported in stem chondrichthyans from the Lower Devonian (e.g. in Seretolepis, Parexus). The results corroborate previous work by recognising lamellin as the main component of sinacanthid spines and point to corresponding developmental patterns shared across the dermal skeleton of taxa with lamellin and more derived chondrichthyans (e.g. Doliodus, Kathemacanthus, Seretolepis and Parexus). The Tarim mongolepid fauna is inclusive of coeval taxa from the South China Block and accounts for over two-thirds of the species currently attributed to Mongolepidida. This demonstrates considerable overlap between the Tarim and South China components of the Lower Silurian Zhangjiajie Vertebrate Fauna.

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New data on Silurian vertebrates of southern Siberia

Cited by 5 publications

References 11 publications

The systematics of the Mongolepidida (Chondrichthyes) and the Ordovician origins of the clade

The systematics of the Mongolepidida (Chondrichthyes) and the Ordovician origins of the clade

Tectonic History of the South Tannuol Fault Zone (Tuva Region of the Northern Central Asian Orogenic Belt, Russia): Constraints from Multi-Method Geochronology

Early Silurian chondrichthyans from the Tarim Basin (Xinjiang, China)

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