New dispersed seed-megaspores from the mid-Givetian of European Russia

被引：8

作者：

Arkhangelskaya, AD

Turnau, E

机构：

[1] Polish Acad Sci, Inst Geol Sci, Krakow Res Ctr, PL-31002 Krakow, Poland

[2] All Russia Res Geol Oil Inst, VNIGNI, Moscow 105118, Russia

来源：

REVIEW OF PALAEOBOTANY AND PALYNOLOGY | 2003年 / 127卷 / 1-2期

关键词：

Devonian; Givetian; seed-megaspore; Russia; evolution;

D O I：

10.1016/S0034-6667(03)00093-9

中图分类号：

Q94 [植物学];

学科分类号：

071001 ;

摘要：

New genus and species of dispersed megaspore tetrads, consisting of one large (presumably fertile) and three small (presumably aborted) spores, are described from mid-Givetian deposits of European Russia. These are probably the oldest seed-megaspores recorded so far. The new taxon is Granditetraspora zharkovae gen. et sp. nov. A progymnosperm affinity for the fossil is suggested. It is also implied that the parent plants of the described seed-megaspores arose from ancestors that displayed only a low grade of heterospory. (C) 2003 Elsevier B.V. All rights reserved.

引用

页码：45 / 58

页数：14

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