Cunoniaceae infructescences from the early Eocene Laguna del Hunco flora, Patagonia, Argentina
Cunoniaceae infructescences from the early Eocene Laguna del Hunco flora, Patagonia, Argentina
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来自阿根廷巴塔哥尼亚早期始新世 Laguna del Hunco 植物群的 Cunoniaceae 果序
DOI：
10.1002/ajb2.1867
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发表时间：
2022
影响因子：
3
通讯作者：
Wilf, Peter
中科院分区：
文献类型：
--
作者：
Matel, Theodore P.;Gandolfo, María A.;Hermsen, Elizabeth J.;Wilf, Peter
阿根廷巴塔哥尼亚丘布特省早始新世拉古纳德尔洪科植物群的两种不同类型的化石果序保存了古诺尼科的特征。这项研究的目标是评估他们的亲缘关系内Cunoniaceae和解释其进化和地理significant.MethodsSpecimens收集的Tufolitas拉古纳德尔Hunco，Huitrera形成。他们准备，拍照，并比较形态学上与类似的现存和化石的水果和果序，使用已发表的文献和植物标本material.ResultsThe水果和果序形态的地方Cunoniaceae内的化石类群。它们不符合任何现存的属，支持两个新化石属的建立。Racemofructusgen。nov.具有Cunonieae族的特征，特别是Weinmannias. l.，并表现出两个部落形态学的共形：一个总状花序和一个由一根柱子组成的假花序。标本是圆锥状花序具基瓣开裂，二心皮蒴果，具宿存花柱和花萼。它的replum形态表明，一个亲和的部落Caldcluvieae，特别是属Ackama.Conclusions的新巴塔哥尼亚化石这里描述的构成最古老的记录cunoniaceous胶囊全球，补充了一个重要的身体化石证据，从花粉，木材，和生殖结构，表明Cunoniaceae是多样化的，并广泛分布在南半球的早期始新世，Racemofructus和Cunoniocarpaare，分别是南美洲第一个生殖结构的化石记录，与Cunonieae和Caldcluvieae部落有密切关系。
PremiseTwo distinct types of fossil infructescences from the early Eocene Laguna del Hunco flora, Chubut Province, Patagonia, Argentina, preserve features of the family Cunoniaceae. The goal of the study was to assess their affinities within Cunoniaceae and to interpret their evolutionary and biogeographical significance.MethodsSpecimens were collected from the Tufolitas Laguna del Hunco, Huitrera Formation. They were prepared, photographed, and compared morphologically with similar extant and fossil fruits and infructescences using published literature and herbarium material.ResultsThe fruit and infructescence morphology place the fossil taxa within Cunoniaceae. They do not conform to any extant genus, supporting the erection of two new fossil genera.Racemofructusgen. nov. shares diagnostic features of the tribe Cunonieae, especiallyWeinmannias.l., and exhibits two tribal morphological synapomorphies: a racemose inflorescence and a replum composed of a single column.Cunoniocarpagen. nov. specimens are paniculate inflorescences with basipetally dehiscent, bicarpellate capsules that have persistent styles and calyces. Its replum morphology suggests an affinity to the tribe Caldcluvieae, particularly to the genusAckama.ConclusionsThe new Patagonian fossils described herein constitute the oldest record of cunoniaceous capsules globally, supplementing a significant body of fossil evidence from pollen, wood, and reproductive structures from southern South America and Antarctica that suggests that the Cunoniaceae were diversified and widely distributed in the southern hemisphere by the early Eocene.RacemofructusandCunoniocarpaare, respectively, the first fossil records from South America of reproductive structures with affinity to tribes Cunonieae and Caldcluvieae.