B. Mohr, S. Schultka, Herbert Suess, M. E. Bernardes-DE-Oliveira
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引用次数: 11
摘要
本文报道了巴西下白垩统(上阿普梯统至可能下阿普梯统)克拉托组一个新的裸子植物分类群，Duartenia araripensis gen. nov. et sp. nov.。最突出的标本，一个具有高阶分支的分支，表现出明显的各向异性分支模式。非常致密的木材由管胞组成，管胞具有间隔和部分相邻的单元化凹坑和低射线，每交叉场有一个凹坑(混合原生型)。当叶片未被磨损时，Duartenia呈现出皮质的短叶类叶片。Duartenia可能与首足类针叶树有关，但其系统亲缘性仍不确定。茂密的木材，特有的生长模式和厚的鳞片状毛状叶片可能与反映季节性干燥气候的生态条件有关。
A new drought resistant gymnosperm taxon Duartenia araripensis gen. nov et sp nov (Cheirolepidiaceae?) from the Early Cretaceous of Northern Gondwana
A new gymnosperm taxon from the Lower Cretaceous (upper Aptian to possibly lower Albian) Crato Formation of Brazil, Duartenia araripensis gen. nov. et sp. nov. is described. The most prominent specimen, a branch with attached lateral branches of higher orders exhibits a distinct anisotomous branching pattern. The very dense wood is composed of tracheids with spaced and partly contiguous uniseriate pits and low rays with one pit per cross-field (mixed protopinaceous type). When foliage is not abraded, Duartenia exhibits coriacious Brachyphyllum-type leaves. Duartenia may be linked to cheirolepid conifers, however, the systematic affinity remains uncertain. The dense wood, characteristic growth pattern and thick, scale like, trichome bearing leaves may be related to ecological conditions that reflect a seasonally dry climate.
期刊介绍：
Section B of Palaeontographica publishes contributions to palaeobotany, i.e. papers on morphological traits, systematics and phylogenetic features of plants as well as papers on palaeoclimatology and palynogeography. Especially worth mentioning are the comprehensive monographs published in Palaeontographica B on specific floras or plant groups. Often palaeoclimatic or stratigraphic problems are clarified by resorting to palaeobotanical data published in Section B of Palaeontographica.
Throughout the last decades, numerous objects important to palaeophytology have been found in many places all over the world. As Palaeontographica publishes papers on floras on any parts of the world to report world-wide research, contributions in German, English and French have been published since the beginning of the journal, today English language publications are preferred.
Palaeontographica B is of interest to palaeobotanists, palynologists, palaeoclimatologists, stratigraphers and the libraries of all institutions engaging in such research.
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