In our new study, we conduct a comprehensive meta-analysis based on the 16S rRNA genes of MBG-D archaea. Results show that MBG-D archaea are one of the most frequently found archaeal lineages in global sediment with widespread distribution and high abundance, including 16 subgroups in total. Co-occurrence analyses indicate significant non-random association of MBG-D archaea with Lokiarchaeota and Hadesarchaea, suggesting potential interactions among these archaeal groups.
Meanwhile, based on four nearly complete metagenome-assembled genomes (MAGs) and corresponding metatranscriptomes reconstructed from mangrove and intertidal mudflat sediments, we provide insights on metabolic potentials and ecological functions of MBG-D archaea. Our results reveal MBG-D archaea as an important ubiquitous benthic sedimentary archaeal group with specific mixotrophic metabolisms. Based on the 16S rRNA gene and whole genome analysis, we proposed the name Thermoprofundales as a new Order within the Class Thermoplasmata.
Thermoprofundales (Ther.mo.pro.fund.a'les. N.L. suff. -ales ending designing an order name; N.L. masc. pl. n. Thermoprofundales, the order denoting MBG-D archaea, affiliated to Thermoplasmata). This nomenclature of Thermoprofundales is derived from the class name of Thermoplasmata. Since Thermoprofundales was first discovered in marine benthic sediments with various widespread distribution and enigmatic ecological roles, L. adj. profundus could generally describe its living preference
Details information could be found by this DOI: https://www.nature.com/articles/s41396-018-0321-8.