Phylogeny and evolution of the horsetails: Evidence from spore wall ultrastructure

Grauvogel‐Stamm, Léa; Lugardon, Bernard

doi:10.1016/j.revpalbo.2008.10.002

Cited by 12 publications

(8 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Within this group, Equisetum was suggested as sister group of the marattioid ferns (Pryer et al, 2001(Pryer et al, , 2004. Subsequent studies placed Equisetum as the sister group of the Ophioglossidae+Psilotidae clade (Karol et al, 2010;Grewe et al, 2013;Christenhusz and Chase, 2014), which had been previously suggested on the basis of ultrastructural features of their spores (Grauvogel-Stamm and Lugardon, 2009). On the other hand, phylogenetic analyses also including extinct equisetaleans suggest that the genus Equisetum is not contained within the ferns (Rothwell, 1999).…”

Section: Fossil Representatives Of Equisetum Have Been Variouslymentioning

confidence: 81%

Reconstruction and Phylogenetic Significance of a NewEquisetumLinnaeus Species from the Lower Jurassic of Cerro Bayo (Chubut Province, Argentina)

et al. 2015

View full text Add to dashboard Cite

Abstract. We describe Equisetum dimorphum sp. nov. from the Lower Jurassic of Chubut Province, Patagonia, Argentina. This new species is based on fertile and vegetative remains preserved as impressions of stems, leaves, strobili, transversal sections of the stems showing their anatomy, and terminal pagoda-like structures. The fine-grained sedimentary matrix also preserved detailed impressions of epidermal features. The morphological characters allow a whole-plant reconstruction and assignment to Equisetum. Equisetum dimorphum sp. nov. shows a mosaic of morphological characters that are commonly present in other Mesozoic forms and representatives of the two extant Equisetum subgenera, e.g., sunken stomata and a blunt strobilus apex. Compared to other well-known Mesozoic equisetalean taxa, Equisetum dimorphum sp. nov. appears to be most closely related to a group of Jurassic Equisetum-like plants including Equisetum laterale Phillips and Equisetites ferganensis Seward. Additional evidence for the morphological stasis of the fertile and vegetative organs of extant horsetails is supplied with this new material, adding further support to the hypothesis that the extant horsetails are a successful group that has undergone only little morphological changeover time and that has been present, nearly worldwide, since Jurassic times.Key words. Equisetales. Equisetum. Systematic. Jurassic. Patagonia. Resumen. RECONSTRUCCIÓN E IMPLICANCIAS FILOGENÉTICAS DE UNA NUEVA ESPECIE DE EQUISETUM LINNAEUS DEL JURASICO INFERIORDE CERRO BAYO (PROVINCIA DEL CHUBUT, ARGENTINA). En el presente trabajo se describe Equisetum dimorphum sp. nov., una nueva equisetal del Jurásico Inferior de la Provincia del Chubut, Patagonia, Argentina. Esta nueva especie está basada tanto en restos vegetativos como fér-tiles, preservados como impresiones y moldes de ejes, hojas, estróbilos, secciones transversales de los ejes mostrando su anatomía y estructuras terminales de tipo "pagoda". El grano fino del sedimento ayudó a preservar también impresiones detalladas de caracteres epidér-micos. Los caracteres morfológicos preservados permiten la reconstrucción de la planta y su asignación a Equisetum. La relación de E. dimorphum sp. nov. con otras equisetales del Mesozoico es discutida. Equisetum dimorphum sp. nov. muestra un mosaico de caracteres morfológicos que comúnmente se encuentran presentes en distintos representantes de los dos subgéneros de Equisetum, e.g., estomas hundidos y un ápice estrobilar romo. En comparación con otros taxones bien conocidos de equisetales del Mesozoico, Equisetum dimorphum sp. nov. parece estar más cercanamente emparentado con un grupo de plantas de tipo Equisetum del Jurásico, que incluye a Equisetum laterale Phillips y Equisetites ferganensis Seward. Se aporta evidencia adicional acerca del estasis morfológico de los órganos fértiles y vegetativos de Equisetum actuales, añadiendo de esta manera mayor sustento a la hipótesis que sugiere que Equisetum es un género exitoso que no ha cambiado mucho morfológicamente a través del t...

show abstract

Section: Fossil Representatives Of Equisetum Have Been Variouslymentioning

confidence: 81%

Reconstruction and Phylogenetic Significance of a NewEquisetumLinnaeus Species from the Lower Jurassic of Cerro Bayo (Chubut Province, Argentina)

et al. 2015

View full text Add to dashboard Cite

show abstract

“…Deltoidospora ) and are thus reasonably resistant to taphonomic processes such as transportation and corrosion. Conversely, some spores, such as C. mesozoica , possess a thin spore wall and contain little sporopollenin (Traverse ; Grauvogel‐Stamm and Lugardon ) and are resultantly comparatively underrepresented.…”

Section: Discussionmentioning

confidence: 99%

Middle Jurassic vegetation dynamics based on quantitative analysis of spore/pollen assemblages from the Ravenscar Group, North Yorkshire, UK

Slater

Wellman

2016

Palaeontology

View full text Add to dashboard Cite

Quantitative analysis of the distribution of dispersed spores and pollen (sporomorphs) has been used to assess temporal floral variation through the Middle Jurassic Ravenscar Group (Aalenian-Bathonian), North Yorkshire, UK. Aalenian, Bajocian and Bathonian strata possess relatively distinct sporomorph and palynofacies assemblages, which potentially reflect a dynamic history regarding the nature of parent vegetation. Specifically, Aalenian palynofloras are composed of a heterogeneous mixture of conifers, ferns, simple monosulcate pollen producers, sphenophytes and Caytoniales; Bajocian palynofloras are codominated by conifers and ferns; and Bathonian palynofloras are highly rich and contain assemblages of abundant ferns, conifers, lycophytes, pteridosperms/ conifers and Caytoniales. Individual-and sample-based rarefaction demonstrates that Bathonian samples are richer than Aalenian and Bajocian samples. Temporal variations in assemblages are a result of long-term depositional and possible climatic fluctuations through the Middle Jurassic. Ordinations of sporomorph data using non-metric multidimensional scaling (NMDS) demonstrate that short-term variations between samples are largely governed by taphonomic biases as a result of slight changes in depositional processes, which give rise to highly variable catchment areas that supply deposits with sporomorphs. Long-term compositional changes are apparent in sporomorph assemblages regardless of lithology/local depo-sitional environments, suggesting that long-term variations are more substantial than short-term variations and potentially include genuine regional temporal changes in parent vegetation. Relating sporomorph assemblages with their respective depositional environments and relative catchment area sizes using lithological and palynofacies information suggests that the basin interior was occupied by mostly low-standing species and extrabasinal vegetation was dominated by coniferous taxa. Comparisons of the dispersed sporomorph and plant megafos-sil records indicate that both fossil assemblages reflect different aspects of the palaeoflora due to a multitude of taphonomic and ecological biases. Such biases include variation in sporo-morph production levels, depositional environment and differential sporomorph and parent plant durability.

show abstract

“…This discrepancy is probably due to the highly durable nature of Equisetum , which means that this genus is overrepresented compared to other megafloral taxa. Conversely, C. mesozoica has a low preservation potential due to its thin wall and low sporopollenin content (Traverse 2007; Grauvogel-Stamm and Lugardon 2009), thus this species is underrepresented in the sporomorph assemblage. These combined factors give rise to a notable differential preservation potential between the parent plant and sporomorph.…”

Section: Discussionmentioning

confidence: 99%

A quantitative comparison of dispersed spore/pollen and plant megafossil assemblages from a Middle Jurassic plant bed from Yorkshire, UK

Slater

Wellman

2015

Paleobiology

View full text Add to dashboard Cite

Abstract.-Detailed quantitative data has previously been collected from plant megafossil assemblages from a Middle Jurassic (Aalenian) plant bed from Hasty Bank, North Yorkshire, UK. We conducted a similar analysis of palynological dispersed sporomorph (spore and pollen) assemblages collected from the same section using the same sampling regime: 67 sporomorph taxa were recorded from 50 samples taken at 10 cm intervals through the plant bed. Basic palynofacies analysis was also undertaken on each sample. Both dispersed sporomorph and plant megafossil assemblages display consistent changes in composition, diversity (richness), and abundance through time. However, the dispersed sporomorph and plant megafossil records provide conflicting evidence for the nature of parent vegetation. Specifically, conifers and ferns are underrepresented in plant megafossil assemblages, bryophytes and lycopsids are represented only in sporomorph assemblages, and sphenophytes, pteridosperms, Caytoniales, Cycadales, Ginkgoales and Bennettitales are comparatively underrepresented in sporomorph assemblages. Combined multivariate analysis (correspondence analysis and nonmetric multidimensional scaling) of sporomorph occurrence/abundance data demonstrates that temporal variation in sporomorph assemblages is the result of depositional change through the plant bed. The reproductive strategies of parent plants are considered to be a principal factor in shaping many of the major abundance and diversity irregularities between dispersed sporomorph and plant megafossil data sets that seemingly reflects different parent vegetation. Preferential occurrence/preservation of sporomorphs and equivalent parent plants is a consequence of a complex array of biological, ecological, geographical, taphonomic, and depositional factors that act inconsistently between and within fossil assemblages, which results in notable discrepancies between data sets.

show abstract

Phylogeny and evolution of the horsetails: Evidence from spore wall ultrastructure

Cited by 12 publications

References 13 publications

Reconstruction and Phylogenetic Significance of a NewEquisetumLinnaeus Species from the Lower Jurassic of Cerro Bayo (Chubut Province, Argentina)

Reconstruction and Phylogenetic Significance of a NewEquisetumLinnaeus Species from the Lower Jurassic of Cerro Bayo (Chubut Province, Argentina)

Middle Jurassic vegetation dynamics based on quantitative analysis of spore/pollen assemblages from the Ravenscar Group, North Yorkshire, UK

A quantitative comparison of dispersed spore/pollen and plant megafossil assemblages from a Middle Jurassic plant bed from Yorkshire, UK

Contact Info

Product

Resources

About