Anatomy of the Middle Devonian cladoxylopsid Panxia gabata Y. Wang et Berry from Yunnan Province, southwestern China

Xue, Jinzhuang; Huang, Pu; Wang, Biao; Wang, Qi; Shen, Hao

doi:10.1016/j.revpalbo.2015.05.005

Cited by 9 publications

(12 citation statements)

References 35 publications

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“…: the Pseudosporochnales and the non‐pseudosporochnalean cladoxylopsids. Whereas the Pseudosporochnales are considered monophyletic by Xue et al (2010, 2016), non‐pseudosporochnaleans are an informal group including plants that cannot be included among either Pseudosporochnales or Iridopteridales (Meyer‐Berthaud et al, 2007; Wang et al, 2015). Although the Iridopteridales have been excluded from the formally circumscribed Cladoxylopsida (Meyer‐Berthaud et al, 2007), their close relations to the latter are widely accepted.…”

Section: Discussionmentioning

confidence: 99%

“…The Iridopteridales include a number of species (Berry and Stein, 2000; Meyer‐Berthaud et al, 2007; Xue et al, 2016; Appendix S1), some of which are known only morphologically from adpression fossils— Anapaulia moodyi (Berry and Edwards, 1996), Compsocradus givetianus (Wang, 2008; Fu et al, 2011), and Ibyka vogtii Høeg (Høeg, 1942; Berry, 2005)—while others are known primarily by their anatomy— Arachnoxylon minor (Stein et al, 1983), Arachnoxylon kopfii (Arnold, 1935; Stein, 1981; Stein et al, 1983), Asteropteris noveboracensis (Dawson, 1881; Bertrand, 1913; Sebby, 1972), Iridopteris eriensis (Stein, 1982), and Rotoxylon dawsonii (Read, 1935; Cordi and Stein, 2005)—and yet others are more completely characterized in terms of both anatomy and morphology— Compsocradus laevigatus (Berry and Stein, 2000) and Ibyka amphikoma (Skog and Banks, 1973; Berry, 2005). Additionally, Serripteris feistii (Rowe and Galtier, 1989), Metacladophyton tetraxylum (Wang and Geng, 1997), Metacladophyton ziguinum (Wang and Lin, 2007), and Denglongia hubeiensis (Xue and Hao, 2008; Xue et al, 2010) have been discussed as putative iridopterids.…”

Section: Discussionmentioning

confidence: 99%

“…The latest treatments of the cladoxylopsids (Xue et al, 2016;Wang et al, 2017) divide these plants into three groups, as proposed initially by Wang and Berry (2006) and by Meyer-Berthaud et al (2007). The three groups are the Iridopteridales (treated as a lineage within the Cladoxylopsida by most authors, until Meyer-Berthaud et al [2007] excluded them from the class) and two groups within Meyer-Berthaud et al's Cladoxylopsida s.s.: the Pseudosporochnales and the non-pseudosporochnalean cladoxylopsids.…”

Section: Traditional Classificationmentioning

confidence: 99%

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A new phylogeny of the cladoxylopsid plexus: contribution of an early cladoxylopsid from the Lower Devonian (Emsian) of Quebec

Durieux

Lopez

Bronson

et al. 2021

American J of Botany

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Premise: Cladoxylopsids formed Earth's earliest forests and gave rise to the ancestors of sphenopsids and ferns. Lower Devonian (Emsian) strata of the Battery Point Formation (Quebec, Canada) contain new anatomically preserved cladoxylopsids, one of which is described in this article. To assess the phylogenetic position of this fossil and address questions of cladoxylopsid phylogeny, we conducted a comprehensive phylogenetic study. Methods: Permineralized axes were studied in serial sections using the cellulose acetate peel technique. We evaluated phylogenetic relationships among cladoxylopsids using a data set of 36 new morphological characters and 31 species, in parsimonyconstrained analyses. Results: We describe Adelocladoxis praecox gen. et sp. nov., a cladoxylopsid with small actinostelic axes bearing dichotomously branched, helically arranged ultimate appendages and fusiform sporangia. Adelocladoxis provides the oldest evidence of cladoxylopsid anatomy, including ultimate appendages and sporangia. In agreement with non-phylogenetic classification schemes, our phylogenetic analysis resolves a basal grade of iridopterids and a clade of cladoxylopsids s.s., which includes a pseudosporochnalean cladoxylopsid clade, a cladoxylalean cladoxylopsid clade, and Adelocladoxis. Conclusions: Our phylogenetic analysis illuminates aspects of tempo and mode of evolution in the cladoxylopsid plexus. Originating prior to the Emsian, cladoxylopsids reached global distribution by the Frasnian. Iridopterids and cladoxylopsids s.s. radiated in the Emsian-Eifelian. The sequence of character change recovered by our phylogeny supports a transition from actinostelic protosteles to dissected steles, associated with an increase in xylem rib number and medullation generating a central parenchymatous area.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Traditional Classificationmentioning

confidence: 99%

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A new phylogeny of the cladoxylopsid plexus: contribution of an early cladoxylopsid from the Lower Devonian (Emsian) of Quebec

Durieux

Lopez

Bronson

et al. 2021

American J of Botany

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“…This is the case for Panxia Wang and Berry, a Middle Devonian genus from Yunnan tentatively assigned to the Cladoxylopsida by its authors (Wang and Berry, 2006). Xue et al (2016) provide the first detailed anatomical description of a branching stem of Panxia lacking secondary tissues. They show that this specimen shares anatomical features with members of both the Cladoxylopsida and the Iridopteridales, supporting the idea that the systematic relationships within this complex of plants are far from being resolved.…”

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confidence: 94%

The terrestrialization process: A palaeobotanical and palynological perspective

Meyer‐Berthaud

Servais

Vecoli

et al. 2016

Review of Palaeobotany and Palynology

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“…2015; Xue et al . 2015). These groups are of significance in that they bear directly on the investigation of the origin, early diversification and evolution of the ferns, sphenopsids and lignophytes; however, the systematics and taxonomy of these basal plants have been the subject of much debate.…”

Section: Introductionmentioning

confidence: 99%

Melvillipteris quadriseriatagen. et sp. nov., a new plant assigned to Rhacophytales from the Upper Devonian (Famennian) of Arctic Canada

Xue

Basinger

2015

Geol. Mag.

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A new plant of Late Devonian (Famennian) age, Melvillipteris quadriseriata gen. et sp. nov., is reported from Melville Island, Nunavut, Canadian Arctic Archipelago. Main axes and two orders of lateral branches are recognized. The main axes are monopodial in habit, with a zigzag and/or upright appearance and dense adventitious roots attached on some internodes. First-order branches are inserted on the main axes in distichous pairs, showing a quadriseriate pattern (i.e. alternate pairs); they bear one or two sterile ultimate appendages on the proximal portions, and then distally bear alternate second-order branches. Second-order branches bear alternate ultimate appendages which may be fertile or sterile; the sterile ultimate appendages are composed of one or two successive dichotomies, terminating in oppositely recurved tips, and fertile appendages show an elaborate branching system. Each fertile appendage has an initial dichotomy forming two sister branches, each of which further divides three or four times to produce ultimate divisions terminated by sporangia. Two to four small fusiform sporangia are grouped in a truss which is supplied by penultimate division of the fertile appendage. The sporangia have a pointed tip and a longitudinal dehiscence. This new plant resembles other plants with a quadriseriate branching pattern (e.g. Rhacophyton Crépin, Cephalopteris Nathorst, Protocephalopteris Ananiev, Ellesmeris Hill, Scheckler & Basinger and Protopteridophyton Li & Hsü), and is assigned to the Rhacophytales. Its similarity to and divergence from the rhacophytaleans, cladoxylopsids and other related plants are discussed.

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Anatomy of the Middle Devonian cladoxylopsid Panxia gabata Y. Wang et Berry from Yunnan Province, southwestern China

Cited by 9 publications

References 35 publications

A new phylogeny of the cladoxylopsid plexus: contribution of an early cladoxylopsid from the Lower Devonian (Emsian) of Quebec

A new phylogeny of the cladoxylopsid plexus: contribution of an early cladoxylopsid from the Lower Devonian (Emsian) of Quebec

The terrestrialization process: A palaeobotanical and palynological perspective

Melvillipteris quadriseriatagen. et sp. nov., a new plant assigned to Rhacophytales from the Upper Devonian (Famennian) of Arctic Canada

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