Novel diversity of deeply branching Holomycota and unicellular Holozoans revealed by metabarcoding in middle Paraná River, Argentina
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Frontiers Media
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Opisthokonta represents a major lineage of eukaryotes and includes fungi and
metazoans, as well as other less known unicellular groups. The latter are paraphyletic
assemblages that branch in between the former two groups, and thus are important
for understanding the origin and early diversification of opisthokonts. The full range of
their diversity, however, has not yet been explored from diverse ecological habitats.
Freshwater environments are crucial sources for new diversity; they are considered
even more heterogeneous than marine ecosystems. This heterogeneity implies more
ecological niches where local eukaryotic communities are located. However, knowledge
of the unicellular opisthokont diversity is scarce from freshwater environments. Here, we
performed an 18S rDNA metabarcoding study in the Middle Paraná River, Argentina,
to characterize the molecular diversity of microbial eukaryotes, in particular unicellular
members of Opisthokonta. We identified a potential novel clade branching as a
sister-group to Fungi. We also detected in our data that more than 60% operational
taxonomic units classified as unicellular holozoans (animals and relatives) represent
new taxa at the species level. Of the remaining, the majority was assigned to the
newly described holozoan species, Syssomonas multiformis. Together, our results show
that a large hidden diversity of unicellular members of opisthokonts still remain to be
uncovered. We also found that the geographical and ecological distribution of several
taxa considered exclusive to marine environments is wider than previously thought.
Para citar este articulo: Arroyo AS, López-Escardó D, Kim E, Ruiz-Trillo I and Najle SR (2018) Novel Diversity of Deeply Branching Holomycota and Unicellular Holozoans Revealed by Metabarcoding in Middle Paraná River, Argentina. Front. Ecol. Evol. 6:99. doi: 10.3389/fevo.2018.00099
Para citar este articulo: Arroyo AS, López-Escardó D, Kim E, Ruiz-Trillo I and Najle SR (2018) Novel Diversity of Deeply Branching Holomycota and Unicellular Holozoans Revealed by Metabarcoding in Middle Paraná River, Argentina. Front. Ecol. Evol. 6:99. doi: 10.3389/fevo.2018.00099
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