A Non‐Flagellated Member of the Myxogastria and Expansion of the Echinosteliida

Fiore‐Donno, Anna Maria; Tice, Alexander K.; Brown, Matthew W.

doi:10.1111/jeu.12694

Cited by 23 publications

(13 citation statements)

References 36 publications

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“…However, a well-developed capillitium with anastomosing branches separates Clastoderma from the Echinosteliales, which is supported by our 18S rDNA phylogeny (Fig. 2) and by the two-gene phylogeny of Fiore-Donno et al (2018). The homogenous upper portion of the stalk, connected to the capillitium in C. debaryanum, may represent an initial epihypothallic stalk, while the lower part seems to form via the intermediate way as in Echinosteliales.…”

Section: Classification Of the Myxomycetessupporting

confidence: 73%

“…2), Clastoderma branches together with members of the superorder Stemonitidia but not with Echinosteliidia, with similar support of the corresponding clade. Independently, Fiore-Donno et al (2018) found the same topology in a phylogeny based on 18S rRNA and EF1A genes. We cannot ignore this result and thus separate Clastoderma from the Echinosteliales, although the hypothesis on the monophyly of both taxa could not be rejected by the Approximately Unbiased test and additional studies are needed with broader sampling of Clastoderma and Echinostelium to clarify the relationships between these taxa.…”

Section: ••• Subclass Columellomycetidaementioning

confidence: 63%

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Towards a phylogenetic classification of the Myxomycetes

et al. 2019

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The traditional classification of the Myxomycetes (Myxogastrea) into five orders (Echinosteliales, Liceales, Trichiales, Stemonitidales and Physarales), used in all monographs published since 1945, does not properly reflect evolutionary relationships within the group. Reviewing all published phylogenies for myxomycete subgroups together with a 18S rDNA phylogeny of the entire group serving as an illustration, we suggest a revised hierarchical classification, in which taxa of higher ranks are formally named according to the International Code of Nomenclature for algae, fungi and plants. In addition, informal zoological names are provided. The exosporous genus Ceratiomyxa, together with some protosteloid amoebae, constitute the class Ceratiomyxomycetes. The class Myxomycetes is divided into a bright- and a dark-spored clade, now formally named as subclasses Lucisporomycetidae and Columellomycetidae, respectively. For bright-spored myxomycetes, four orders are proposed: Cribrariales (considered as a basal group), Reticulariales, a narrowly circumscribed Liceales and Trichiales. The dark-spored myxomycetes include five orders: Echinosteliales (considered as a basal group), Clastodermatales, Meridermatales, a more narrowly circumscribed Stemonitidales and Physarales (including as well most of the traditional Stemonitidales with durable peridia). Molecular data provide evidence that conspicuous morphological characters such as solitary versus compound fructifications or presence versus absence of a stalk are overestimated. Details of the capillitium and peridium, and especially how these structures are connected to each other, seem to reflect evolutionary relationships much better than many characters which have been used in the past.

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Section: Classification Of the Myxomycetessupporting

confidence: 73%

Section: ••• Subclass Columellomycetidaementioning

confidence: 63%

Towards a phylogenetic classification of the Myxomycetes

et al. 2019

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“…Myxomycetes constitute a terminal branch in the phylum Amoebozoa (Cavalier‐Smith ) and the main group in Macromycetozoa, along Dictyostelia and Protosporangiida ( Ceratiomyxa ) (Fiore‐Donno et al. ; Kang et al. ).…”

Section: Specimens Used In This Study Herbarium Number Location Comentioning

confidence: 99%

“…The main division in Myxomycetes lies between the superorders Lucisporidia and Fuscisporidia, characterized by bright and dark spore color, respectively (Fiore‐Donno et al. 2010b, ; Kretzschmar et al. ).…”

Section: Specimens Used In This Study Herbarium Number Location Comentioning

confidence: 99%

Phylogeny of Physarida (Amoebozoa, Myxogastria) Based on the Small‐Subunit Ribosomal RNA Gene, Redefinition of Physarum pusillum s. str. and Reinstatement of P. gravidum Morgan

Cainelli

Haan

Meyer³

et al. 2020

J Eukaryotic Microbiology

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Myxomycetes (also called Myxogastria or colloquially, slime molds) are worldwide occurring soil amoeboflagellates. Among Amoebozoa, they have the notable characteristic to form, during their life cycle, macroscopic fruiting bodies, that will ultimately release spores. Some 1,000 species have been described, based on the macroscopic and microscopic characteristics of their fruiting bodies. We were interested in Physarum pusillum (Berk. & M.A. Curtis) G. Lister, a very common species described with two variants, each bearing such morphological differences that they could represent two distinct species. In order to test this, we observed key characters in a large selection of specimens attributed to P. pusillum, to its synonyms (in particular Physarum gravidum), and to related species. In addition, the small-subunit ribosomal RNA gene was obtained from seven of these specimens. Based on these data, we provide a comprehensive phylogeny of the order Physarida (Eukaryota: Amoebozoa: Conosa: Macromycetozoa: Fuscisporidia). Morphology and phylogeny together support the reinstatement of P. gravidum Morgan 1896 with a neotype here designated, distinct from P. pusillum, here redefined.

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“…The close similarities in the life cycles of the protosporangids and myxomycetes point to homologous developmental programs. Indeed, Clark & Haskins (2014) hypothesized that the ancestral myxomycete formed fruiting bodies through a simple sporocarpy-like process, as found in the early-branching (Fiore-Donno et al, 2010, 2013Fiore-Donno, Tice & Brown, 2018) genera Echinostelium and Cribraria.…”

Section: The Multicellular Sporocarpy Hypothesismentioning

confidence: 99%

Two potential evolutionary origins of the fruiting bodies of the dictyostelid slime moulds

Hehmeyer

2019

Biological Reviews

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Dictyostelium discoideum and the other dictyostelid slime moulds (‘social amoebae’) are popular model organisms best known for their demonstration of sorocarpic development. In this process, many cells aggregate to form a multicellular unit that ultimately becomes a fruiting body bearing asexual spores. Several other unrelated microorganisms undergo comparable processes, and in some it is evident that their multicellular development evolved from the differentiation process of encystation. While it has been argued that the dictyostelid fruiting body had similar origins, it has also been proposed that dictyostelid sorocarpy evolved from the unicellular fruiting process found in other amoebozoan slime moulds. This paper reviews the developmental biology of the dictyostelids and other relevant organisms and reassesses the two hypotheses on the evolutionary origins of dictyostelid development. Recent advances in phylogeny, genetics, and genomics and transcriptomics indicate that further research is necessary to determine whether or not the fruiting bodies of the dictyostelids and their closest relatives, the myxomycetes and protosporangids, are homologous.

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A Non‐Flagellated Member of the Myxogastria and Expansion of the Echinosteliida

Cited by 23 publications

References 36 publications

Towards a phylogenetic classification of the Myxomycetes

Towards a phylogenetic classification of the Myxomycetes

Phylogeny of Physarida (Amoebozoa, Myxogastria) Based on the Small‐Subunit Ribosomal RNA Gene, Redefinition of Physarum pusillum s. str. and Reinstatement of P. gravidum Morgan

Two potential evolutionary origins of the fruiting bodies of the dictyostelid slime moulds

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