Azolla Sporophytes and Spores from the Late Cretaceous and Paleocene of Patagonia, Argentina
Azolla Sporophytes and Spores from the Late Cretaceous and Paleocene of Patagonia, Argentina
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阿根廷巴塔哥尼亚晚白垩世和古新世的满江红孢子体和孢子
DOI：
10.1086/704377
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发表时间：
2019
影响因子：
2.3
通讯作者：
Gandolfo, Maria A.
中科院分区：
文献类型：
--
作者：
Hermsen, Elizabeth J.;Jud, Nathan A.;De Benedetti, Facundo;Gandolfo, Maria A.
满江红化石记录丰富，大孢子器和小孢子囊分散，但孢子体化石相对较少。本文描述了采自阿根廷巴塔哥尼亚丘布特省的两个满江红化石种：Azolla coloniensisDe Benedetti & Zamaloa，emend。Hermsen等人，和A. keujaJud等人，sp. nov.Azolla coloniensi和A. keuja是满江红的第一个化石物种，以植物结构为代表（即，叶、茎和根）。 Coloniensis来自上白垩统La科洛尼亚组Cañadón del Irupé地区，A. keuja来自Palacio de los Loros地区PL-2，古新统Salamanca组。A.从孢子体标本及其周围的岩石基质中获得。使用标准光学显微镜、落射荧光显微镜和扫描电子显微镜研究材料。化石保存在阿根廷丘布特省Talluw的Paleontológico Egidio Feruglio博物馆。初步结果：满江红coloniensis产生了许多漂浮的大孢子器和小孢子囊，具有锚尖钩介体，将其置于化石AzollasectionFlorschuetzia中。nilotica和晚白垩世-古新世北美种A.结果表明，三种植物的小孢子囊结构相似，但大孢子器的结构不同，不能归属于满江红属的任何组。keuja是重要的，因为他们提供了两个新的有机体概念灭绝物种红萍。我们无法完全分类A. keujato剖面的研究结果，结合红萍化石的形态多样性，表明有必要对红萍的发生学和分类学进行一个综合性的重新评价，将现存种和化石种结合起来。
Premise of research. WhileAzollahas a rich fossil record based on dispersed megaspore apparatuses and microspore massulae, fossil sporophytes are relatively rare. In this contribution, we describe two fossilAzollaspecies based on both sporophytes and spores from Chubut Province, Patagonia, Argentina:Azolla coloniensisDe Benedetti & Zamaloa, emend. Hermsen et al., andA. keujaJud et al., sp. nov.Azolla coloniensisandA. keujaare the first fossil species ofAzollato be represented by vegetative structures (i.e., leaves, stems, and roots) from both South America and the Southern Hemisphere.Methodology. We examined sporophyte material ofA. coloniensisfrom the Cañadón del Irupé locality, Upper Cretaceous, La Colonia Formation, andA.keujafrom the Palacio de los Loros locality PL-2, Paleocene, Salamanca Formation. Spores ofA. keujawere obtained from a sporophyte specimen and its surrounding rock matrix. Material was studied using standard light microscopy, epifluorescence microscopy, and scanning electron microscopy. Fossils are held at the Museo Paleontológico Egidio Feruglio, Trelew, Chubut Province, Argentina.Pivotal results.Azolla coloniensisproduced many-floated megaspore apparatuses and microspore massulae with anchor-tipped glochidia, placing it in the fossilAzollasectionFlorschuetzia.Azolla keujasporophytes are structurally similar to those produced by the extant African speciesA. niloticaand the Late Cretaceous–Paleocene North American speciesA. schopfiiin overall size, growth form, leaf structure, and production of fascicled roots; while all three taxa produce similar microspore massulae, the structure of their megaspore apparatuses differ.Azolla keujacannot be assigned to any section ofAzolla.Conclusions.Azolla coloniensisandA. keujaare important because they provide two new organismal concepts for extinct species ofAzolla. Our inability to fully classifyA. keujato section, in combination with the great morphological diversity of fossilAzolla, indicates that a comprehensive reevaluation of phylogeny and taxonomy that incorporates both extant and fossil species is needed.
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影响因子：
2.3
作者：
T. Yamada;Masahiro Kato
通讯作者：
T. Yamada;Masahiro Kato
来自始新世北极和北欧海沉积物的淡水蕨类满江红（Azollaceae）：新物种及其地层分布
影响因子：
1.9
作者：
J. Burgh;M. Collinson;J. K. Cittert;J. Barke;H. Brinkhuis
通讯作者：
H. Brinkhuis
始新世北冰洋淡水蕨类满江红（满江红科）新种
影响因子：
1.9
作者：
M. Collinson;J. Barke;J. Burgh;J. K. Cittert
通讯作者：
J. K. Cittert
来自印度德干特拉普盆地的萨尔维尼亚和满江红化石
DOI：
--
发表时间：
1991
期刊：
影响因子：
--
作者：
E. Nambudiri;S. Chitaley
通讯作者：
S. Chitaley
地质系新生代植物名录，第一卷。
DOI：
--
发表时间：
--
期刊：
影响因子：
--
作者：
E. Berry
通讯作者：
E. Berry