By how much do we underestimate species diversity of liverworts using morphological evidence? An example from Australasian Plagiochila (Plagiochilaceae: Jungermanniopsida)

Renner, Matt A. M.; Heslewood, Margaret M.; Patzak, Simon D. F.; Schäfer‐Verwimp, Alfons; Heinrichs, Jochen

doi:10.1016/j.ympev.2016.12.018

Cited by 59 publications

(40 citation statements)

References 123 publications

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“…6), confirming the status of eight species while revealing the existence of at least six undescribed species. The taxonomical consequences of our analyses will be presented elsewhere, but our results are consistent with previous studies in Plagiochila, wherein Renner et al (2017) estimated that real diversity in Australasian species is 29% higher than currently recognized and 36% of currently accepted and previously untested…”

Section: Software Availabilitysupporting

confidence: 90%

“…The taxonomical consequences of our analyses will be presented elsewhere, but our results are consistent with previous studies in Plagiochila , wherein Renner et al . () estimated that real diversity in Australasian species is 29% higher than currently recognized and 36% of currently accepted and previously untested species are para‐ or polyphyletic. Altogether, these results stress the necessity of molecular species delimitations combined with thorough morphological investigation in organisms with reduced morphologies like bryophytes.…”

Section: Resultsmentioning

confidence: 97%

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Quantification of complex modular architecture in plants

et al. 2018

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Morphometrics, the assignment of quantities to biological shapes, is a powerful tool to address taxonomic, evolutionary, functional and developmental questions. We propose a novel method for shape quantification of complex modular architecture in thalloid plants, whose extremely reduced morphologies, combined with the lack of a formal framework for thallus description, have long rendered taxonomic and evolutionary studies extremely challenging. Using graph theory, thalli are described as hierarchical series of nodes and edges, allowing for accurate, homologous and repeatable measurements of widths, lengths and angles. The computer program MorphoSnake was developed to extract the skeleton and contours of a thallus and automatically acquire, at each level of organization, width, length, angle and sinuosity measurements. Through the quantification of leaf architecture in Hymenophyllum ferns (Polypodiopsida) and a fully worked example of integrative taxonomy in the taxonomically challenging thalloid liverwort genus Riccardia, we show that MorphoSnake is applicable to all ramified plants. This new possibility of acquiring large numbers of quantitative traits in plants with complex modular architectures opens new perspectives of applications, from the development of rapid species identification tools to evolutionary analyses of adaptive plasticity.

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Section: Software Availabilitysupporting

confidence: 90%

Section: Resultsmentioning

confidence: 97%

Quantification of complex modular architecture in plants

et al. 2018

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“…Plagiochila partially resembled those obtained by Patzak et al (2016) and Renner et al (2017), and the most of internal node still stayed without support. The newly sequenced Plagiochila specimen formed the basal branch to the clade of Circumboreal and East Asian Plagiochila (with the only exception for Java-Sumatra P. korthalsiana Molk.…”

Section: With Indication Of Bootstrap Support Values (Bs)supporting

confidence: 55%

“…Plagiochila in 96-97 % by ITS12 and 98-99 % by rbcL. Based on previous phylogenetic studies on the genus Plagiochila (Patzak et al 2016, Renner et al 2017 for our analysis we selected 10 species (13 specimens) of sect. Plagiochila and P. flexuosa (sect.…”

Section: R E S U L T Smentioning

confidence: 99%

A new large-celled species of Plagiochila (Plagiochilaceae, Hepaticae) from the southern flank of the Russian Far East

Bakalin¹,

Vilnet²

2017

Bot Pac

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A new species of Plagiochila is described from cool-temperate Ussuri taiga zone in the Russian Far East using integrative morphological and molecular-genetic ap proach. Plagiochila sichotensis Bakalin et Vilnet sp. nov. (sect. Plagiochila) is charac terized by totally entire leaves, relatively small size and, particularly, very large midleaf cells reaching 40-60 µm wide in the leaf middle. The latter feature distin guishes the new species from all known taxa of the genus and, among regional ta xa, somewhat similar to the not evolutionary related Mylia. This epixylous taxon seems to be confined in its distribution to the low to middle elevation of moun tains in the southern Sikhote-Alin Mts. The description, illustrations and dis cus sion on the new species are provided.

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“…Accordingly, taxonomic studies still identify incongruences between morphology-based taxonomic hypotheses and DNA-based phylogenies and, consequently, genus and family concepts are frequently revised (e.g., Bechteler et al, 2016;Long et al, 2016;Patzak et al, 2016). Taking the considerable difficulties into account that hamper the classification of the present-day liverwort diversity (Renner et al, 2017), it comes as no surprise that fossils of liverworts often have an even complexer and more confusing taxonomic history (Grolle and Meister, 2004), especially if only fragments, rather than entire plants, are preserved . These fragments often do not display the whole complement of relevant taxonomic characters, and thus the classification of these forms often needs to be revised when additional, more completely preserved specimens become available.…”

Section: Introductionmentioning

confidence: 99%

Problems related to the taxonomic placement of incompletely preserved amber fossils: transfer of the Paleogene liverwort Cylindrocolea dimorpha (Cephaloziellaceae) to the extant Odontoschisma sect. Iwatsukia (Cephaloziaceae)

et al. 2017

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Abstract. A revision of the Baltic and Bitterfeld amber fossils assigned to Cylindrocolea dimorpha (Cephaloziellaceae) has yielded evidence of the presence of multicellular, bifid underleaves, which have not previously been reported for this species and conflict with the current circumscription of the family. We transfer the fossil species to Odontoschisma (sect. Iwatsukia) and propose the new combination O. dimorpha of the Cephaloziaceae. Characteristics of the fossil include an overall small size of the plant, entire-margined, bifid leaves and underleaves, more or less equally thickened leaf cell walls, ventral branching that includes stoloniform branches with reduced leaves, and the lack of a stem hyalodermis and gemmae. Placement of the fossil in Cephaloziaceae profoundly affects divergence time estimates for liverworts based on DNA sequence variation with integrated information from the fossil record. Our reclassification concurs with hypotheses on the divergence times of Cephaloziaceae derived from DNA sequence data that provide evidence of a late Early Cretaceous to early Eocene age of the Odontoschisma crown group and an origin of O. sect. Iwatsukia in the Late Cretaceous to Oligocene.

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By how much do we underestimate species diversity of liverworts using morphological evidence? An example from Australasian Plagiochila (Plagiochilaceae: Jungermanniopsida)

Cited by 59 publications

References 123 publications

Quantification of complex modular architecture in plants

Quantification of complex modular architecture in plants

A new large-celled species of Plagiochila (Plagiochilaceae, Hepaticae) from the southern flank of the Russian Far East

Problems related to the taxonomic placement of incompletely preserved amber fossils: transfer of the Paleogene liverwort <i>Cylindrocolea dimorpha</i> (Cephaloziellaceae) to the extant <i>Odontoschisma</i> sect. <i>Iwatsukia</i> (Cephaloziaceae)

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By how much do we underestimate species diversity of liverworts using morphological evidence? An example from Australasian Plagiochila (Plagiochilaceae: Jungermanniopsida)

Cited by 59 publications

References 123 publications

Quantification of complex modular architecture in plants

Quantification of complex modular architecture in plants

A new large-celled species of Plagiochila (Plagiochilaceae, Hepaticae) from the southern flank of the Russian Far East

Problems related to the taxonomic placement of incompletely preserved amber fossils: transfer of the Paleogene liverwort &lt;i&gt;Cylindrocolea dimorpha&lt;/i&gt; (Cephaloziellaceae) to the extant &lt;i&gt;Odontoschisma&lt;/i&gt; sect. &lt;i&gt;Iwatsukia&lt;/i&gt; (Cephaloziaceae)

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Problems related to the taxonomic placement of incompletely preserved amber fossils: transfer of the Paleogene liverwort <i>Cylindrocolea dimorpha</i> (Cephaloziellaceae) to the extant <i>Odontoschisma</i> sect. <i>Iwatsukia</i> (Cephaloziaceae)