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Open research questions in Protist diversity and phylogeny

259 gap statements mined from Protist diversity and phylogeny papers in our 7.9M-paper local library, which holds 921 papers on the topic — drawn mostly from each paper's own stated research gap, future-work, challenge and limitation notes, and its abstract. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one.

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What the literature leaves open

  • Whether the gatekeeping function of the AV is an architectural consequence of its position within the apicomplexan secretory pathway, rather than a feature of its primary evolutionary origin, remains unclear.

    A conserved GTPase complex gates exocytosis for defence and parasitism across alveolates · 2026 · DOI

  • Future research should focus on elucidating the functional roles of soil protists within forest ecosystems and assessing the impacts of climate change and anthropogenic disturbances on these vital communities.

    The Patterns and Environmental Factors of Diversity, Co-Occurrence Networks, and Assembly Processes of Protistan Communities in Bulk Soils of Forests · 2025 · DOI

  • However, the assembly and functional succession of soil protistan communities by invasion-induced habitat modification, particularly across different invasion stages, remain poorly understood.

    Plant invasion drives stage-dependent shifts in soil protistan diversity and community assembly in estuarine wetlands · 2026 · DOI

  • However, the drivers of protist diversity and their co-occurrence and interaction with prokaryotic communities in dynamic rhizocompartments and between wheat varieties are not well understood.

    Drivers of Protist Diversity and Functions, and Protist–Prokaryote Co-Occurrence Pattern Across Wheat Rhizocompartments · 2026 · DOI

  • Soil protists play crucial roles in nutrient cycling, organic matter decomposition, and regulating belowground food webs, but relatively little is known about the effects of tree diversity on this microscopic group.

    Tree species richness and identity influence the abundance of excysted soil ciliates in young forest plantations · 2026 · DOI

  • Intensifying stratification in marginal seas is transforming planktonic ecosystems, yet the interaction between taxonomic composition, functional traits, and biomass remains poorly quantified.

    Seasonal hydrography shapes protist composition, trophic mode, and size structure in the northern East China Sea: evidence from organelle metagenomics and pigment chemotaxonomy · 2026 · DOI

  • The intestinal ciliates of the naked mole-rat ( Heterocephalus glaber) remain poorly characterized.

    Morphological and molecular characterization of an undescribed vestibuliferid ciliate from the captive-bred naked mole-rat, Heterocephalus glaber (Rodentia: Bathyergidae) · 2026 · DOI

  • However, molecular phylogenetic and population genetic studies of ciliates in Northeast China, particularly in the geologically complex Changbai Mountains region, remain scarce.

    Phylogenetic study of several representative ciliate species in the Changbai Mountain region of Northeast China · 2026 · DOI

  • The 18S rRNA gene has emerged as the primary molecular marker for amplicon-based characterization of microalgal communities, including in wastewater treatment systems, yet trade-offs between short- and long-read approaches remain poorly defined.

    Systematic Comparisons between Long-Read- and Short-Read-Based Amplicon Sequencing to Characterize Mixed Microalgal Communities · 2026 · DOI

  • Molecular genetic markers have been used for their taxonomy, although they have not been thoroughly evaluated.

    Evaluating nuclear (18S, ITS, and 28S) and chloroplast (psbB, psbC, rbcL, and tufA) genes of the green algae Monoraphidium (Sphaeropleales, Chlorophyta) for DNA barcoding · 2025 · DOI

  • Lately their diversity in marine environments has been shown to be greatly underappreciated and many lineages of intracellular holocarpic parasites, infecting micro- and macro-algae, remain to be fully described taxonomically.

    Holocarpic oomycete parasites of red algae are not Olpidiopsis, but neither are they all Pontisma or Sirolpidium (Oomycota) · 2024 · DOI

  • Since their discovery, many field studies on Parmales have been performed; however, their global distribution has not yet been examined in detail.

    Global Distribution and Diversity of Marine Parmales · 2024 · DOI

  • The molecular clock estimates for the age of LECA have produced estimates ranging from 1000 Ma to 1900 Ma, reflecting uncertainty in substitution rates and calibration points.

    Clade dynamics support an early origin of crown eukaryotes · 2026 · DOI

  • Molecular phylogeny analyses based on SSU rDNA sequence data support previous inferences that Cyclotrichium should be removed from Litostomatea; however, its final class-level affiliation remains to be investigated.

    Taxonomy and Phylogeny of the Little-Known Ciliate Genus Cyclotrichium: With Special Reference to Two New Species · 2026 · DOI

  • The extent and sources of prokaryotic contributions to the eukaryotic proteome remain debated. The driving force behind the endosymbiotic integration is still under debate.

    Origins of eukaryotic metabolism · 2026 · DOI

  • The functional diversity and distribution of microbial eukaryotes remain incompletely understood. The study aims to address this gap by examining microbial eukaryote assemblages in the Arctic.

    Taxonomy as an indicator of trophic diversity in microbial eukaryotic plankton in an Arctic outflow gateway · 2026 · DOI

  • The study faced challenges in identifying pcox-CO oxidizers due to the lack of conserved genes. The study had to develop stringent criteria to minimize overestimation of pcox-CO oxidizer diversity.

    Diversity and geographical distribution of potential carbon monoxide oxidizers using molybdenum-containing enzymes in the ocean · 2026 · DOI

  • The study may have underestimated the diversity of pcox-CO oxidizers due to relatively low read recruitment. The study used a limited number of species clusters for absolute quantification.

    Diversity and geographical distribution of potential carbon monoxide oxidizers using molybdenum-containing enzymes in the ocean · 2026 · DOI

  • The need for a review and archiving process for digital interactions datasets. The lack of a citable version of the globalbioticinteractions/fungaltraits dataset.

    Versioned Archive and Review of Biotic Interactions and Taxon Names Found within globalbioticinteractions/fungaltraits hash://md5/3d1deb1394360f06cebca96cf7d0a3a4 · 2026 · DOI

  • The approach was limited to DNA as a template. The data is not Lagrangian as the four water masses do not flow in concert.

    Taxonomy as an indicator of trophic diversity in microbial eukaryotic plankton in an Arctic outflow gateway · 2026 · DOI

  • Previous studies have shown mixed results regarding the α diversity of soil protists between natural and plantation forests, indicating species-specific effects…

    The Patterns and Environmental Factors of Diversity, Co-Occurrence Networks, and Assembly Processes of Protistan Communities in Bulk Soils of Forests · 2025 · DOI

  • In a global context, these results reinforce the role of peatlands as reservoirs of microbial diversity, particularly in underexplored regions like the Chilean Patagonia.

    Protist ecology in Patagonian peatlands: pH, organic phosphorus, and sulfate as key drivers of testate amoeba diversity in undisturbed ecosystems · 2025 · DOI

  • Further investigation of the evolution of eukaryotes using fossil-testable predictions. Development of more complex models that account for additional effects. Investigation of the implications of the results for our understanding of the evolution of eukaryotes.

    Clade dynamics support an early origin of crown eukaryotes · 2026 · DOI

  • Further analysis of the phylogenetic signals of different metabolic functions. Investigation of the mechanisms of horizontal gene transfer between prokaryotes.

    Origins of eukaryotic metabolism · 2026 · DOI

  • Further study of the mechanisms of bacterial entry into mitochondria. Investigation of the metabolic exchanges between mitochondria and endosymbiotic bacteria.

    Volume electron microscopy reveals bacterial endosymbiosis within host mitochondria · 2026 · DOI

Most-cited papers in Protist diversity and phylogeny

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Open questions raised by papers listed on this page include: (1) Whether the gatekeeping function of the AV is an architectural consequence of its position within the apicomplexan secretory pathway, rather than a feature of its primary evolutionary origin, remains unclear (“A conserved GTPase complex gates exocytosis for defence and parasitism across…”, 2026); (2) The assembly and functional succession of soil protistan communities by invasion-induced habitat modification, particularly across different invasion stages, remain poorly understood (“Plant invasion drives stage-dependent shifts in soil protistan diversity and…”, 2026); (3) The drivers of protist diversity and their co-occurrence and interaction with prokaryotic communities in dynamic rhizocompartments and between wheat varieties are not well understood (“Drivers of Protist Diversity and Functions, and Protist–Prokaryote…”, 2026); (4) Soil protists play crucial roles in nutrient cycling, organic matter decomposition, and regulating belowground food webs, but relatively little is known about the effects of tree diversity on this microscopic group (“Tree species richness and identity influence the abundance of excysted soil…”, 2026); (5) Molecular phylogenetic and population genetic studies of ciliates in Northeast China, particularly in the geologically complex Changbai Mountains region, remain scarce (“Phylogenetic study of several representative ciliate species in the Changbai…”, 2026). 259 gap statements have been mined from Protist diversity and phylogeny papers in our 7.9M-paper local library, which holds 921 papers on the topic; the gaps come from whichever of those papers state one. They are mostly the research gaps the authors state and the papers' abstracts, plus future-work, limitations and challenges passages. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one, so you can read the original claim in context.

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