An Early Cretaceous zamiaceous cycad of South West Gondwana: Restrepophyllum nov. gen. from Patagonia, Argentina

Passalia, Mauro Gabriel; Fueyo, Georgina M. Del; Archangelsky, Sérgio

doi:10.1016/j.revpalbo.2010.04.001

Cited by 39 publications

(27 citation statements)

References 42 publications

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“…6) as well as fossil cycads (i.e. Restrepophyllum , [38]). In extant cycads, the thickened aspect of the tooth is given by a concentration of marginal fibres.…”

Section: Discussionmentioning

confidence: 99%

“…Such phylogenetic evidence, which is lacking for many fossil cycads that have been linked with extant groups, such as Restrepophyllum [38] and Austrozamia [25], as well as for the many fossil leaves assigned to extant genera [21–24, 26–28], make Eobowenia a reliably placed cycad fossil foliage.…”

Section: Discussionmentioning

confidence: 99%

“…Some of the most interesting fossils come from the Lower Cretaceous Baquero Group in Patagonia, Argentina, which also yielded one of the highest diversities in cycad leaf taxa [36]. Among these are the leaf taxa Mesodescolea [37] and Restrepophyllum [38], which have been provisionally linked with extant Stangeria and Zamia (including Chigua ) , respectively. Other cycadalean taxa from the Baquero Group, such as Pseudoctenis ornata A.Archang., R.Andreis, S.Archang.…”

Section: Introductionmentioning

confidence: 99%

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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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“…6) as well as fossil cycads (i.e. Restrepophyllum , [38]). In extant cycads, the thickened aspect of the tooth is given by a concentration of marginal fibres.…”

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…Passalia et al 2010, Sun et al 2008, Kunzmann 2007, although in each case the extant taxonomic diversity is less than in the past. Gnetidae were often considered as the sister group of angiosperms (Chase et al 1993), and Gnetum L. indeed resembles an angiosperm in general habit.…”

Section: Introductionmentioning

confidence: 98%

A new classification and linear sequence of extant gymnosperms

Christenhusz¹,

Reveal²,

Farjon³

et al. 2011

Phytotaxa

414

239

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A new classification and linear sequence of the gymnosperms based on previous molecular and morphological phylogenetic and other studies is presented. Currently accepted genera are listed for each family and arranged according to their (probable) phylogenetic position. A full synonymy is provided, and types are listed for accepted genera. An index to genera assists in easy access to synonymy and family placement of genera.

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“…Where cuticle is preserved, Bennettitales are readily distinguishable from Cycadales by their syndetocheilic as opposed to haplocheilic stomata (Florin 1933). In the absence of cuticular details, bennettitalean and cycadalean foliage can be difficult to discriminate, although the Cycadales typically have larger (30-600 cm) leaves with more diverse venation styles, commonly contracted and thickened leaflet bases, and, in some cases, lobed or spinose margins (Jones 1993;Passalia et al 2010).…”

Section: Introductionmentioning

confidence: 99%

Ptilophyllum muelleri(Ettingsh.) comb. nov. from the Oligocene of Australia: Last of the Bennettitales?

McLoughlin

Carpenter

Pott

2011

International Journal of Plant Sciences

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Several small pinnate leaves of early Oligocene age from Cethana, Tasmania, are newly described and found to be conspecific with Anomozamites muelleri Ettingsh. recorded from coeval strata at Emmaville, northern New South Wales. These fossils are most probably referable to the Bennettitales on the basis of leaf size, leaflet shape, and venation patterns, in the absence of diagnostic cuticular details. They are transferred to Ptilophyllum on the basis of leaflet morphology and represent the youngest putative bennettitalean remains yet documented. Their occurrence reinforces previous arguments that the highest-paleolatitude fragments of southeastern Gondwana provided moist temperate refugia for the survival of Mesozoic gymnosperm taxa well into the Cenozoic.

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An Early Cretaceous zamiaceous cycad of South West Gondwana: Restrepophyllum nov. gen. from Patagonia, Argentina

Cited by 39 publications

References 42 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?

A new classification and linear sequence of extant gymnosperms

Ptilophyllum muelleri(Ettingsh.) comb. nov. from the Oligocene of Australia: Last of the Bennettitales?

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