Mixoxylon australe gen. et sp. nov., a unique homoxylous wood with non-angiosperm affinity from the Lower Cretaceous of Antarctica (Albian, James Ross Island)

IF 2 4区地球科学 Q3 ENVIRONMENTAL SCIENCES

Antarctic Science Pub Date : 2021-10-01 DOI:10.1017/S0954102021000389

Oleksandra Chernomorets, J. Sakala

引用次数: 0

Abstract

Abstract A unique homoxylous wood is described from the Albian Lewis Hill Member of the Whisky Bay Formation on James Ross Island as Mixoxylon australe Chernomorets & Sakala, gen. et sp. nov. This fossil taxon shows an unusual combination of features in having indistinct growth rings with a significantly wider earlywood zone than latewood zone, tracheids with scalariform to araucarian pitting, exclusively uniseriate rays with distinctly pitted both tangential and horizontal walls and araucarioid to podocarpoid cross-field pits. Its characteristics are intermediate between Phoroxylon Sze and Sahnioxylon Bose & Sah, so a new genus is proposed. Its systematic affinities are dubious, but it represents the southernmost evidence of the homoxylous Mesozoic wood with scalariform pitting described so far.

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Mixoxylon australe gen.et sp.nov.，一种来自南极洲下白垩纪（Albian，James Ross岛）的具有非被子植物亲和性的独特同源木

摘要:本文描述了詹姆斯罗斯岛Whisky Bay组Albian Lewis Hill成员的一种独特的同质木材，名为Mixoxylon australe Chernomorets & Sakala, et sp. 11 .这个化石分类群具有不同寻常的组合特征:生长年轮不明显，早木带比晚木带宽得多，管胞具有鳞片状到砂状的点蚀。完全单一的射线，具有明显的切向和水平壁凹痕和弓形到足形交叉场凹痕。其特征介于Phoroxylon Sze和Sahnioxylon Bose & Sah之间，因此提出了一个新属。它的系统亲和性尚不确定，但它代表了迄今为止描述的具有鳞状麻点的中生代同源木材的最南端证据。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Antarctic Science 地学-地球科学综合

CiteScore

3.60

自引率

6.20%

发文量

审稿时长

3 months

期刊介绍： Antarctic Science provides a truly international forum for the broad spread of studies that increasingly characterise scientific research in the Antarctic. Whilst emphasising interdisciplinary work, the journal publishes papers from environmental management to biodiversity, from volcanoes to icebergs, and from oceanography to the upper atmosphere. No other journal covers such a wide range of Antarctic scientific studies. The journal attracts papers from all countries currently undertaking Antarctic research. It publishes both review and data papers with no limits on length, two-page short notes on technical developments and recent discoveries, and book reviews. These, together with an editorial discussing broader aspects of science, provide a rich and varied mixture of items to interest researchers in all areas of science. There are no page charges, or charges for colour, to authors publishing in the Journal. One issue each year is normally devoted to a specific theme or papers from a major meeting.