Cuticular characters adapted to volcanic stress in a new Cretaceous cycad leaf from Patagonia, Argentina. Considerations on the stratigraphy and depositional history of the Baqueró Formation

Archangelsky, Ana; Andreis, Renato R.; Archangelsky, Sérgio; Artabe, Analía E.

doi:10.1016/0034-6667(95)00011-x

Cited by 60 publications

(38 citation statements)

References 12 publications

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“…Other cycadalean taxa from the Baquero Group, such as Pseudoctenis ornata A.Archang., R.Andreis, S.Archang. et A.Artabe [39], present interesting morphological similarities with members of extant Cycadales, but their relationships with any extant genus are controversial [40, 41]. …”

Section: Introductionmentioning

confidence: 99%

Eobowenia gen. nov. from the Early Cretaceous of Patagonia: indication for an early divergence of Bowenia?

Coiro

Pott

2017

BMC Evol Biol

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BackgroundEven if they are considered the quintessential “living fossils”, the fossil record of the extant genera of the Cycadales is quite poor, and only extends as far back as the Cenozoic. This lack of data represents a huge hindrance for the reconstruction of the recent history of this important group. Among extant genera, Bowenia (or cuticles resembling those of extant Bowenia) has been recorded in sediments from the Late Cretaceous and the Eocene of Australia, but its phylogenetic placement and the inference from molecular dating still imply a long ghost lineage for this genus.ResultsWe re-examine the fossil foliage Almargemia incrassata from the Lower Cretaceous Anfiteatro de Ticó Formation in Patagonia, Argentina, in the light of a comparative cuticular analysis of extant Zamiaceae. We identify important differences with the other member of the genus, viz. A. dentata, and bring to light some interesting characters shared exclusively between A. incrassata and extant Bowenia. We interpret our results to necessitate the erection of the new genus Eobowenia to accommodate the fossil leaf earlier assigned as Almargemia incrassata. We then perfom phylogenetic analyses, including the first combined morphological and molecular analysis of the Cycadales, that indicate that the newly erected genus could be related to extant Bowenia.Conclusion Eobowenia incrassata could represent an important clue for the understanding of evolution and biogeography of the extant genus Bowenia, as the presence of Eobowenia in Patagonia is yet another piece of the biogeographic puzzle that links southern South America with Australasia.Electronic supplementary materialThe online version of this article (doi:10.1186/s12862-017-0943-x) contains supplementary material, which is available to authorized users.

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Section: Introductionmentioning

confidence: 99%

Eobowenia gen. nov. from the Early Cretaceous of Patagonia: indication for an early divergence of Bowenia?

Coiro

Pott

2017

BMC Evol Biol

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“…to determine whether variation in cuticle micromorphology reflects current phylogenetic relationships among the species. These data were compared with information available in the literature with regard to fossil taxa from the Mesozoic and Cenozoic which have been related to modern Dioon (Florin, ; Horiuchi & Kimura, ; Hill & Pole, ; Archangelsky et al ., ; Erdei, Akgün & Barone Lumaga, ; Erdei, Manchester & Kvaček, ; Tang, ), with the aim of tracking the persistence of ancestral characters in the studied species and inferring ecological constraints that acted in early Dioon evolution.…”

Section: Introductionmentioning

confidence: 99%

Epidermal micromorphology inDioon: did volcanism constrainDioonevolution?

et al. 2015

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The genus Dioon occupies an important phylogenetic position as sister to the other Zamiaceae. However, its epidermal morphology is still poorly known. We employed scanning and transmission electron microscopy, confocal microscopy and light microscopy to examine the epidermal and cuticular morphology of 12 of the 14 currently recognized species of Dioon, examining cultivated plants and herbarium specimens. Epidermal characters separate Dioon quite clearly from the other genera of the cycads. Within the genus, the major subgroups can be distinguished by their epidermal morphology. Some characters, such as the degree of stomatal protection, reflect ecological specializations in species within the subgroups. Several epidermal characters of the crown group Dioon seem to be absent in the Cenozoic fossils usually associated with the genus, which have been used as calibrations in many recent molecular dating analyses. The presence of similar characters in a Mesozoic fossil adapted to volcanic stress offers a new key in the interpretation of Dioon evolution

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“…How-ever, the taphonomical and paleoenviromental studies of this flora are few; A. Archangelsky et al (1995) and described for the Punta del Barco Formation, a plant com-munity composed mainly of Araucariaceae, Podocarpaceae, Cycadales nd Gleicheniaceae buried by airfall volcanic ash. a…”

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confidence: 99%

Early Cretaceous riparian vegetation in Patagonia, Argentina

Cladera¹,

Fueyo²,

Seoane³

et al. 2007

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Early Cretaceous riparian vegetation in Patagonia, Argentina. An autochthonous plant as-semblage found at the Bajo Grande locality, Anfiteatro de Ticó Formation, Baqueró Group, Early Aptian of Santa Cruz province, Argentina, is described. Sedimentological data show an alternation of sandstone and lime-stone, with recurrent fossil levels associated to a fluvial system. The frequent flood in areas close to the levee had an influence on the vegetation growing along the banks of the channels. A plant assemblage composed of Ricciopsis grandensis nov. sp. (bryophyte), Adiantopteris tripinnata nov. sp., Schizaeaceae pinnules (ferns), and the gnetalean fructification Ephedra verticillata nov. sp. was found in this paleoenvironment. The taphonomical studies suggest that the plant assemblage was autochthonous, and it grew and was buried in an area near a levee. This result is congruent with environmental data provided by living representative of the fossil taxa analyzed.

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Cuticular characters adapted to volcanic stress in a new Cretaceous cycad leaf from Patagonia, Argentina. Considerations on the stratigraphy and depositional history of the Baqueró Formation

Cited by 60 publications

References 12 publications

Eobowenia gen. nov. from the Early Cretaceous of Patagonia: indication for an early divergence of Bowenia?

Eobowenia gen. nov. from the Early Cretaceous of Patagonia: indication for an early divergence of Bowenia?

Epidermal micromorphology inDioon: did volcanism constrainDioonevolution?

Early Cretaceous riparian vegetation in Patagonia, Argentina

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