A new Late Devonian isoetalean lycopsid from New South Wales, Australia: Cymastrobus irvingii gen. et sp. nov

Evreïnoff, Mathilde; Meyer‐Berthaud, Brigitte; Decombeix, Anne‐Laure; Lebrun, Renaud; Steemans, Philippe; Tafforeau, Paul

doi:10.26879/767

Cited by 9 publications

(15 citation statements)

References 44 publications

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“…In this paper, we describe a new iridopteridalean plant genus of Late Devonian age from the locality of Barraba in New South Wales, one of the rare localities of this age in eastern Australia to have provided anatomically preserved plant fossils of excellent quality (Chambers & Regan, 1986;Meyer-Berthaud, Soria & Young, 2007;Evreïnoff et al, 2017). We further discuss the significance of this discovery in relation to the stratigraphical and palaeogeographical occurrences of the Iridopteridales.…”

Section: Introductionmentioning

confidence: 88%

“…At the Barraba locality Keraphyton is associated with numerous axes of Leptophloeum australe preserved as adpressions together with anatomically preserved specimens of the lycopsid Cymastrobus irvingii, the non-pseudosporochnalean cladoxylopsid Polyxylon australe, and wood fragments referable to the archaeopteridalean progymnosperm genus Callixylon (Chambers & Regan, 1986;Meyer-Berthaud, Soria & Young, 2007;Evreïnoff et al, 2017). Leptophloeum australe and Callixylon were cosmopolitan taxa in the Late Devonian but Cymastrobus, Polyxylon autrale, and now Keraphyton have not been recorded elsewhere, supporting the distinctiveness of at least part of the vegetation in eastern Australia at this time.…”

Section: Palaeogeographical and Stratigraphical Considerationsmentioning

confidence: 99%

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Peer Review #1 of "Keraphyton gen. nov., a new Late Devonian fern-like plant from Australia (v0.1)"

Stein¹

2020

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The first plants related to the ferns are represented by several extinct groups that emerged during the Devonian. Among them, the iridopterids are closely allied to the sphenopsids, a group represented today by the genus Equisetum. They have been documented in Middle to early Late Devonian deposits of Laurussia and the Kazakhstan plate. Their Gondwanan record is poor, with occurrences limited to Venezuela and Morocco. Here we describe a new genus from a late Late Devonian locality of New South Wales. It is represented by a single anatomically preserved large stem characterized by a star-shaped vascular system with protoxylem strands located at rib tips, and by a lack of secondary tissues. Within the first fern-like plants, this stem shares the largest number of characters with iridopterid axes but differs by the pattern of its vascular system. Keraphyton mawsoniae gen. et sp. nov. adds a new record of early fern-like plants in eastern Gondwana. It provides new insights into the anatomical diversity within this key group of plants and supports the distinctiveness of the Australian flora in the latest Devonian.

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Section: Introductionmentioning

confidence: 88%

Section: Palaeogeographical and Stratigraphical Considerationsmentioning

confidence: 99%

Peer Review #1 of "Keraphyton gen. nov., a new Late Devonian fern-like plant from Australia (v0.1)"

Stein¹

2020

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“…This formation consists of a thick sequence of dark laminated mudstones interbedded with thin layers of whitish siltstones and sandstones (Vickery et al, 2010). The Mandowa Mudstone sites around Barraba have been assigned a Late Famennian age on different lines of evidence detailed in Wright (1988), Vickery et al (2010), Evreïnoff et al (2017), Champreux et al (2020). Recent sedimentological work on the Mandowa Mudstone, involving the study of this formation on the Manilla 1:100,000 geological map south of Barraba, suggested that the depositional environment was a distal marine shelf to continental slope (Vickery et al, 2010).…”

Section: Methodsmentioning

confidence: 99%

“…To address these issues, recent efforts have been made to document more systematically Gondwanan floras of Late Devonian-Early Carboniferous age from low and high paleolatitudes. These studies have focused on localities in South America (Prestianni et al, 2015), Africa (Decombeix and Galtier, 2017;Gess and Prestianni, 2018;Prestianni and Gess, 2019;Tanrattana et al, 2019) and Australia (Galtier et al, 2007;Decombeix et al, 2011b;Evreïnoff et al, 2017;Champreux et al, 2020;Meyer-Berthaud et al, 2021). The plant locality discovered at Barraba (New South Wales) in January 1964 by an amateur geologist, Mr. John Irving, is a rare Late Devonian locality in Australia yielding permineralized specimens associated with adpressions.…”

Section: Introductionmentioning

confidence: 99%

A Late Devonian plant assemblage from New South Wales, Australia: Diversity and specificity

Meyer‐Berthaud

Decombeix

Girard

et al. 2021

Review of Palaeobotany and Palynology

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“…However, the inner structures of these specimens have never been investigated. Because of its utility in the analysis of paleobotanical material (e.g., Feist et al, 2005; Friis et al, 2007; Strullu‐Derrien et al, 2014; Evreïnoff et al, 2017), we used a nondestructive imaging technique useful for observing inner and hidden structures: propagation phase contrast X‐ray synchrotron microcomputed tomography (PPC‐SRμCT). Here, given the preservation of this exceptional new material in hard flints, we discuss the taphonomic processes.…”

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confidence: 99%

Paleohistology of the Cretaceous resin‐producing conifer Geinitzia reichenbachii using X‐ray synchrotron microtomography

Moreau

Philippe

Néraudeau

et al. 2021

American J of Botany

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Premise The conifer Geinitzia reichenbachii was a common member of the Cretaceous Laurasian floras. However, the histology of G. reichenbachii leafy axes was never described in detail, and our knowledge of its paleoecology remains very limited. Using new and exquisitely preserved silicified material from the Upper Cretaceous of western France, we describe G. reichenbachii from the gross morphology to the cellular scale, then discuss paleoecological and taphonomical implications. Methods We examined specimens from two localities in western France (Claix and Moragne) using propagation phase‐contrast X‐ray synchrotron microtomography. Results The cuticle and the inner tissues of leafy axes are preserved in three dimensions. Epidermis, hypodermis, palisade parenchyma, spongy parenchyma, transfusion tracheids, and most of tissues of the vascular cylinder are clearly discernible. The numerous resin ducts are sometimes filled by persisting resin. Additionally, surfaces of some leaves preserved drops and flows of resin. Conclusions Depositional environmental context combined with histological features of G. reichenbachii suggest that this conifer was adapted to a range of marginal‐littoral ecosystems including those open to the sea paleoenvironments and innermost ones influenced by strong continental inputs. Geinitzia reichenbachii was adapted to withstand intense sunlight, hot temperatures coupled with salty sea wind, and dry conditions. The frequent amber‐bearing beds in the Cretaceous from western France with Geinitzia as a main component of the associated floras raises the possibility of a role for Geinitzia in the production of the “Charentese amber”.

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A new Late Devonian isoetalean lycopsid from New South Wales, Australia: Cymastrobus irvingii gen. et sp. nov

Cited by 9 publications

References 44 publications

Peer Review #1 of "Keraphyton gen. nov., a new Late Devonian fern-like plant from Australia (v0.1)"

Peer Review #1 of "Keraphyton gen. nov., a new Late Devonian fern-like plant from Australia (v0.1)"

A Late Devonian plant assemblage from New South Wales, Australia: Diversity and specificity

Paleohistology of the Cretaceous resin‐producing conifer Geinitzia reichenbachii using X‐ray synchrotron microtomography

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