Redescription of the protostelid genus Microglomus, its type species and a new variety

Olive, Lindsay S.; Bennett, Walter E.; Stoianovitch, Carmen

doi:10.1016/s0007-1536(83)80113-2

Cited by 5 publications

(14 citation statements)

References 2 publications

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“…The short stalk (shorter than the diameter of the spore/sporangium) with a sudden apical narrowing to an acute point is the same and is unique among sporocarpic Amoebozoa. Because we were able to germinate material, we were able to show that the amoebae are morphologically similar to those shown in Olive and Stoianovitch (1977) and Olive et al (1983).…”

Section: Discussionmentioning

confidence: 76%

“…Molecular data will need to be gathered on several more isolates fitting this morphospecies concept to understand the true diversity within the genus Microglomus. Olive et al (1983) pointed out that the life cycle of M. paxillus seems to be sexual due to the presence of synaptonemal complexes in nuclei of the developing sporocarp. However, the complete details of the sexual cycle are not known.…”

Section: Discussionmentioning

confidence: 99%

“…This trait was uncharacteristic of other protosteloids and myxomycetes known at the time and, therefore, perhaps a character that unites the two (Haskins et al, 1983). However, further observations on M. paxillus later revealed that spore wall absorption did not actually occur in this taxon (Olive et al, 1983).…”

Section: Introductionmentioning

confidence: 88%

“…In the original description Olive noted similarities between Microglomus paxillus and species in the protosteloid genus Protosporangium (Amoebozoa, Eumycetozoa, Protosporangiida). This was due to the production of fruiting bodies with multiple apical cells by members of both genera (Olive et al, 1983;Olive & Stoianovitch, 1977). Additionally, in the original description of Semimorula liquescens, an amoeboid taxon with a complex life cycle that includes a stalkless fruiting body, the authors noted the amoebae of both S. liquescens and M. paxillus reabsorb their spore walls after germination.…”

Section: Introductionmentioning

confidence: 99%

“…A close relationship to either Protosporangium spp. Or S. liquescens were both suggested cautiously due to the lack of flagellated cells in the lifecycle of M. paxillus unlike the former taxa (Haskins et al, 1983;Olive et al, 1983;Olive & Stoianovitch, 1977). Subsequent molecular phylogenetic studies have shown S. liquescens to be a derived myxomycete (Fiore-Donno et al, 2009) and the protosporangiids to be the closest relatives to the myxomycetes (Kang et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

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Phylogenetic placement of the protosteloid amoeba Microglomus paxillus identifies another case of sporocarpic fruiting in Discosea (Amoebozoa)

Tice

Spiegel

Brown

2023

J Eukaryotic Microbiology

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Protosteloid amoebae are a paraphyletic assemblage of amoeboid protists found exclusively in the eukaryotic assemblage Amoebozoa. These amoebae can facultatively form a dispersal structure known as a fruiting body, or more specifically, a sporocarp, from a single amoeboid cell. Sporocarps consist of one to a few spores atop a noncellular stalk. Protosteloid amoebae are known in two out of three well‐established major assemblages of Amoebozoa. Amoebae with a protosteloid life cycle are known in the major Amoebozoa lineages Discosea and Evosea but not in Tubulinea. To date, only one genus, which is monotypic, lacks sequence data and, therefore, remains phylogenetically homeless. To further clarify the evolutionary milieu of sporocarpic fruiting we used single‐cell transcriptomics to obtain data from individual sporocarps of isolates of the protosteloid amoeba Microglomus paxillus. Our phylogenomic analyses using 229 protein coding markers suggest that M. paxillus is a member of the Discosea lineage of Amoebozoa most closely related to Mycamoeba gemmipara. Due to the hypervariable nature of the SSU rRNA sequence we were unable to further resolve the phylogenetic position of M. paxillus in taxon rich datasets using only this marker. Regardless, our results widen the known distribution of sporocarpy in Discosea and stimulate the debate between a single or multiple origins of sporocarpic fruiting in Amoebozoa.

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Section: Discussionmentioning

confidence: 76%

Section: Discussionmentioning

confidence: 99%