A new species of the genus Sequoiadendron Buchholz (Cupressaceae) from the Upper Cretaceous of the Enmyvaam River Basin, Central Chukotka
- Authors: Sokolova A.B.1, Moiseeva M.G.2
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Affiliations:
- Borissiak Paleontological Institute
- Geological Institute
- Issue: Vol 50, No 1 (2016)
- Pages: 96-107
- Section: Article
- URL: https://journals.rcsi.science/0031-0301/article/view/166261
- DOI: https://doi.org/10.1134/S003103011601010X
- ID: 166261
Cite item
Abstract
A new conifer species, Sequoiadendron tchucoticum A. Sokolova from the Emuneret Formation on the Enmyvaam River (Anadyr River Basin) is described. It is established based on a thorough study of the morphology and epidermal features of shoot impressions, using scanning electron microscopy. The new species has polymorphic shoots with helical branching and three main leaf types: scalelike, subulate, and falcate. Leaves are amphistomatic; amphicyclic stomata are mostly obliquely arranged; ordinary epidermal cells are rectangular, frequently with oblique end walls, and their length-to-width ratio reaches 15: 1. Shoots of the new species prevail among conifers of the Ust’-Emuneret Assemblage. The age of the deposits enclosing the assemblage is debated; according to the latest data, it is estimated as Santonian–Early Campanian.
About the authors
A. B. Sokolova
Borissiak Paleontological Institute
Author for correspondence.
Email: klumbochka@mail.ru
Russian Federation, Profsoyuznaya ul. 123, Moscow, 117997
M. G. Moiseeva
Geological Institute
Email: klumbochka@mail.ru
Russian Federation, Pyzhevskii per. 7, Moscow, 119017