The first dinosaur egg from the Lower Cretaceous of Western Siberia, Russia

Skutschas, Pavel P.; Markova, Valentina D.; Boitsova, Elizaveta A.; Leshchinskiy, Sergey V.; Ivantsov, S. V.; Maschenko, E. N.; Averianov, Alexander O.

doi:10.1080/08912963.2017.1396322

Cited by 16 publications

(9 citation statements)

References 29 publications

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“…; Skutschas et al . ); Zelenitsky et al . () interpreted this ootaxon as theropod eggshell because of its remarkable similarity to Prismatoolithus levis and the presence of squamatic ultrastructure in Prismatoolithus levis , while Mikhailov (, ) claimed the absence of squamatic ultrastructure in Protoceratopsidovum .…”

Section: Discussionmentioning

confidence: 96%

Electron backscatter diffraction (EBSD) analysis of maniraptoran eggshells with important implications for microstructural and taphonomic interpretations

2019

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Electron backscatter diffraction (EBSD) is a useful tool for gathering crystallographic information from carbonate biominerals because it maps out the orientation of crystal grains very precisely. EBSD has become popular in invertebrate palaeontology but its application in vertebrate palaeontology remains limited. However, the study of fossil eggshells is a field where EBSD has wide potential applicability and provides a quantitative approach to fossil eggshell research as well as new qualitative data. Here we analyse fossil and extant maniraptoran dinosaur eggshells using EBSD analysis emphasizing four different aspects. The mapping imaging clarifies previously ambiguous characters such as squamatic ultrastructure and allows a more objective evaluation of avian and non-avian maniraptoran eggshell. In particular, our results imply that the presence of an external zone in the manirpatoran eggshell is not diagnostic of avian eggshell. EBSD analysis can be also used for differentiating true pore canals from cracks in the eggshell radial section, thereby determining the biological genuineness or otherwise of a pore-like structure. Finally, the misorientation angle distribution of the material shows a clear dichotomy that may reflect reproductive brooding strategy, although further studies on contact incubation of palaeognaths and neognaths are needed to confirm this.

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Section: Discussionmentioning

confidence: 96%

Electron backscatter diffraction (EBSD) analysis of maniraptoran eggshells with important implications for microstructural and taphonomic interpretations

2019

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“…Several features of UALVP 57622 support the referral of the fragments to Prismatoolithidae and Prismatoolithus. The narrow, sharp-bordered columns of the prismatic layer are typical of the oofamily, as are laterally continuous growth lines (Varricchio et al 2002, Skutschas et al 2017. The tabular ultrastructure of the mammillary layer and the ill-defined squamatic ultrastructure of the prismatic layer are both characters of Prismatoolithidae (Zelenitsky et al 2002).…”

Section: R a F Tmentioning

confidence: 99%

“…Finally, the gradual transition between the mammillary and prismatic layers is considered a defining feature of Prismatoolithidae (Skutschas et al 2017). Within Prismatoolithidae, oogenera vary in both surface ornamentation and in the number of structural layers.…”

Section: R a F Tmentioning

confidence: 99%

“…The combination of smooth eggshell lacking ornamentation and the presence of three structural layers are only known within a single oogenus, Prismatoolithus. Only two oospecies, Prismatoolithus ilekensis (Skutschas et al 2017) and Prismatoolithus levis (Zelenitsky and Hills 1996), show both of these characters, although the presence of an external layer in the latter is controversial (Varricchio et al 2002, Zelenitsky et al 2002, Jackson et al 2010. Between these oospecies, fragments of UALVP 57622 are more similar to Prismatoolithus levis in terms of the ratio of mammillary to prismatic layers (~1:2.5) and eggshell thickness (0.7 mm -1.2 mm)more than double the thickness of Prismatoolithus ilekensis.…”

Section: R a F Tmentioning

confidence: 99%

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The first record of dinosaur eggshell from the Horseshoe Canyon Formation (Maastrichtian) of Alberta, Canada

Funston¹,

Currie²

2018

Preprint

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Eggs and eggshell are generally rare in the Upper Cretaceous rocks of Alberta, despite being relatively abundant nearby in Montana. Palaeontologists and other people have been prospecting the Horseshoe Canyon Formation for more than a 130 years, but eggshell fragments have only just been recovered. The fragments are unornamented with angusticanaliculate pores and three structural layers. Numerous features support their referral to Prismatoolithus levis, and they confirm the presence of a bird-like external layer in this ootaxon. The fragments, which likely belonged to Albertavenator curriei, are from a site with abundant troodontid teeth and perinate material from hadrosaurs, ceratopsians, and theropods. The discovery of eggshell challenges the notion that the Horseshoe Canyon Formation is too heavily sideritized to preserve eggshell.

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“…Основные обнажения шестаковской толщи: А -общий вид точки Шестаково-1: нижняя пачка (1) глин из-за ракурса на фотографии не видна, iJ -общий вид точки Шестаково-4, В -общий вид точки Шестаково-3, Г-участок разреза Шестаково-3; 2 -пачка желтовато-серых песков и песчанников; 3 -пачка буровато-красных глин; 4 -пачка зеленовато-серых песков и песчанников; 5 -пачка буровато-красных глин ны (основание пачки 5). В основании глинистой пачки было найдено яйцо Prismatoolithus ilekensis [30] (таблица). Выше глинистую пачку 5 перекрывает слой плотного светло-серого мелкозернистого песчани ка с параллельной слоистостью мощностью до 1,5 м. Этот характерный слой (маркирующий гори зонт) разделяет глинистую пачку 5 на верхнюю и нижнюю составляющие, простираясь в толще гли нистых отложений по исследованному разрезу.…”

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The Features of the Geological Structure and Sedimentation of the Early Cretaceous Site of the Terrestrial Vertebrates of Shestakovo (Kemerovo Region, Russia)

Podlesnov

Morkovin

Maschenko

2018

Izvestiya Vysshikh Uchebnykh Zavedeniy. Geologiya i Razvedka

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A new data on the geological structure, conditions of formation and faunal composition of the Early Cretaceous site of the terrestrial vertebrates by Shestakovo village (Kemerovo Region, Western Siberia) has been presented.The consolidated geological section has been constructed along the line Shestakovo-1 — Shestakovo-4 — Shestakovo-3 in which five lithologic members have been identified. A distribution of the vertebrates fauna taxons has been carried out along the selected lithologic members composing the Shestakovo series of the Ilek formation. A new data obtained during fieldwork in 2017 has made it possible to distinguish two main bony levels (lithologic members 3 and 5), which contain whole skeletons of reptiles. Lithofacies analysis has shown that the formation of the sites occurred under the conditions of the fluviolacustrine plain, where the channel, delta and floodplain facies were replaced by lake and lake-marshy facies, forming a series of sedimentation cycles. The latter are the evidence of the increase in the aridization of the climate upwards along the section. The given data calls into question previously expressed point of view about the coastal-marine or lagoon genesis of the Shestakovo series.

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The first dinosaur egg from the Lower Cretaceous of Western Siberia, Russia

Cited by 16 publications

References 29 publications

Electron backscatter diffraction (EBSD) analysis of maniraptoran eggshells with important implications for microstructural and taphonomic interpretations

Electron backscatter diffraction (EBSD) analysis of maniraptoran eggshells with important implications for microstructural and taphonomic interpretations

The first record of dinosaur eggshell from the Horseshoe Canyon Formation (Maastrichtian) of Alberta, Canada

The Features of the Geological Structure and Sedimentation of the Early Cretaceous Site of the Terrestrial Vertebrates of Shestakovo (Kemerovo Region, Russia)

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