在"英语"词典里pteridosperm}的意思

单词 PTERIDOSPERM的词源

From Greek pteris a fern + -sperm.

语源学是对单词起源和它们的结构和意义变化的研究

在英语中PTERIDOSPERM的发音

pteridosperm  [ˈtɛrɪdəˌspɜːm]

PTERIDOSPERM在英语中的意思是什么？

种子蕨门

Pteridospermatophyta

蕨类植物是指几种不同的灭绝种子植物组。 这种植物最古老的化石证据是泥盆纪晚期的埃尔金西亚属。 他们特别是在石炭纪和二叠纪时期兴盛起来。 蕨类植物在中生代期间下降，并且在白垩纪末期大部分消失，尽管一些类似蕨类植物的植物似乎已经存活到全新时期，在塔斯马尼亚化石化。 蕨类植物的概念可以追溯到19世纪后期，当古生物学家认识到许多类似蕨类叶子的石炭纪化石，其解剖特征更让人想起现代种子植物苏铁。 1899年，德国古生物学家亨利·波托尼（HenryPotonié）为这种化石创造了一个“鳕鱼”，表明它们是蕨类植物和苏铁类植物之间的一组非种子植物。

The term Pteridospermatophyta refers to several distinct groups of extinct seed-bearing plants. The oldest fossil evidence of plants of this type is the genus Elkinsia of late Devonian age. They flourished particularly during the Carboniferous and Permian periods. Pteridosperms declined during the Mesozoic Era and had mostly disappeared by the end of the Cretaceous Period, though some pteridosperm-like plants seem to have survived into Eocene times, fossilized in Tasmania. The concept of the pteridosperms goes back to the late 19th century when palaeobotanists came to realise that many Carboniferous fossils resembling fern fronds had anatomical features more reminiscent of the modern-day seed plants, the cycads. In 1899 the German palaeobotanist Henry Potonié coined the term "Cycadofilices" for such fossils, suggesting that they were a group of non-seed plants intermediate between the ferns and cycads.

在英语 词典里pteridosperm的定义

词典中的翼子精的定义是任何已经灭绝的种子蕨类植物蕨类植物也称为种子蕨。

PTERIDOSPERM的翻译

通过我们的英语多语言翻译器,找到pteridosperm的25种语言翻译

该章节所呈现的将pteridosperm由 英语向其他语言的翻译是通过自动统计翻译获得的；在英语中基本的翻译单位是单词«pteridosperm»。

• 翻译者英语 - 中文: pteridosperm
• 翻译者英语 - 西班牙语: pteridospermas
• 英语: pteridosperm
• 翻译者英语 - 印地语: pteridosperm
• 翻译者英语 - 阿拉伯语: pteridosperm
• 翻译者英语 - 俄语: pteridosperm
• 翻译者英语 - 葡萄牙语: pteridosperm
• 翻译者英语 - 孟加拉语: pteridosperm
• 翻译者英语 - 法语: pteridosperm
• 翻译者英语 - 马来语: Pteridosperm
• 翻译者英语 - 德语: pteridosperm
• 翻译者英语 - 日语: pteridosperm
• 翻译者英语 - 韩语: pteridosperm
• 翻译者英语 - 印尼爪哇语: Pteridosperm
• 翻译者英语 - 越南语: pteridosperm
• 翻译者英语 - 泰米尔语: pteridosperm
• 翻译者英语 - 马拉地语: पेरीडोस्पर्म
• 翻译者英语 - 土耳其语: pteridosperm
• 翻译者英语 - 意大利语: pteridosperm
• 翻译者英语 - 波兰语: pteridosperm
• 翻译者英语 - 乌克兰语: pteridosperm
• 翻译者英语 - 罗马尼亚语: pteridosperm
• 翻译者英语 - 希腊语: pteridosperm
• 翻译者英语 - 布尔语(南非荷兰语): pteridosperm
• 翻译者英语 - 瑞典语: pteridosperm
• 翻译者英语 - 挪威语: pteridosperm

与 «PTERIDOSPERM»相关的英语书籍

在以下的参考文献中发现pteridosperm的用法。与pteridosperm相关的书籍以及同一来源的简短摘要提供其在 英语文献中的使用情境。

Paleobotany and the Evolution of Plants

That this represents the way in which the pter- idosperm synangium evolved is evidenced by Carboniferous genera of presumed pteridosperm microspo- rangiate structures (Meyer-Berthaud, 1989). For example, in Zimmermannitheca ( Remy ...

Wilson Nichols Stewart, 1993

Taxonomy of Angiosperms

The Pteridosperm Theory Throughout the Palaeozoic from the Upper Devonian to the Permian, leaves closely resembling those of living ferns are abundant. Some of these leaves were associated with cycad-like.stem structure and on the  ...

V.N. Naik, 1984

Plant Life Through the Ages: A Geological and Botanical ...

In the possession of two kinds of spore a pteridosperm agrees with Selaginella and Isoetes among the lycopods and with the water ferns (Hydropteri- deae) Pilularia and Azolla; but the larger spores of a pteridosperm were not shed from the ...

A. C. Seward, 2010

Paleopalynology: Second Edition

Falcisporites Falcisporites (as well as Vitreisporites and Exiguisporites) pollen was reported from pollen sacs of Caytonanthus (Jurassic caytonialean) and Harrisiothecium (Triassic pteridosperm) by Townrow (1962). Townrow (1965) also ...

Alfred Traverse, 2007

Developmental Genetics and Plant Evolution

Chapter. 6. The. Mostly. Male. theory. of. flower. origins: summary. and. update. regarding. the. Jurassic. pteridosperm. Pteroma. MichaeI W. Frohlich ABSTRACT The Mostly Male theory is the first explanation of the evolutionary origins of the ...

Quentin C.B. Cronk, Richard M. Bateman, Julie A. Hawkins, 2002

The Seeds of Dicotyledons

Misconceptions of the intercalary growth in the chalazal regions of cycads has led to the interpretation of their seeds as bitegmic (Stopes 1905). It has been taken up to reinterpret the lyginopterid pteridosperm seed as the bitegmic forebear of ...

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Paleobotany: The Biology and Evolution of Fossil Plants

Tristichia ovensi gen. sp. nov., a protostelic Lower Carboniferous pteridosperm from Berwickshire and East Lothian, with an account of some associated seeds and cupules. Transactions of the Royal Society of Edinburgh 64: 477–492.

Edith L. Taylor, Thomas N. Taylor, Michael Krings, 2009

Sphenopteris Sellardsii, a Problematical Pteridosperm from ...

Discusses the characteristics of Sphenopteris sellardsii, a new species of pteridosperm based on fertile foliage from the Elmo Limestone member of Early Permian age in east-central Kansas.

Robert W. Baxter, 1978

Geological Survey Professional Paper

DISCUSSION The specimen described here is not only the first demonstrably ovuliferous pteridosperm found in the Hermit Shale, but it is also one of very few examples of seed-bearing pteridospermous foliage known in the Paleozoic of North ...

‎1971

Introduction to Taxonomy of Angiosperms

8.3.3. Pteridosperm. Theory. According to Andrews (1961), some Pteridosperms may have given rise to angiosperms. Many Palaeozoic pteridosperms, like Lagenostoma possess cupulate seeds. On the other hand in Gnetopsis (Figure 8.4) ...

Verma, Verma B. K.

包含词语«PTERIDOSPERM»的新条目

找出国内和国际出版社所讨论的内容，以及词语pteridosperm在以下新条目的上下文中是如何使用的。

City-sized fossilized forest found

Detail of a pteridosperm, an extinct seed-producing fern-like plant. The image shows an area about six cm (2.4 inches) in height. (Courtesy Howard Falcon-Lang) ... «World Science, 四月 07»

World's first rainforest found in Illinois

Detail of a pteridosperm, an extinct seed-producing fern-like plant. Width across image about six centimeters. Credit: Dr. Howard Falcon-Lang ... «Mongabay.com, 四月 07»