A new species of the genus Sequoiadendron Buchholz (Cupressaceae) from the Upper Cretaceous of the Enmyvaam River Basin, Central Chukotka

被引：0
作者：
A. B. Sokolova
M. G. Moiseeva
机构：
[1] Russian Academy of Sciences,Borissiak Paleontological Institute
[2] Russian Academy of Sciences,Geological Institute
来源：
Paleontological Journal | 2016年 / 50卷
关键词：
Cupressaceae sensu lato; conifers; Late Cretaceous; Central Chukotka; Okhotsk–Chukotka Volcanogenic Belt;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
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.
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页码：96 / 107
页数：11
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