Abstract
<jats:title>Abstract</jats:title> <jats:sec> <jats:label/> <jats:p> Na.no.bdel.la.ce'ae. N.L. fem. n. <jats:italic>Nanobdella</jats:italic> , the type genus of the family; L. fem. pl. n. suff. ‐ <jats:italic>aceae</jats:italic> , ending to denote a family; N.L. fem. pl. n. <jats:italic>Nanobdellaceae</jats:italic> , the family <jats:italic>Nanobdella</jats:italic> . </jats:p> <jats:p> Currently, <jats:italic>Nanobdellaceae</jats:italic> is the sole family of the order <jats:italic>Nanobdellales</jats:italic> and contains the sole genus <jats:italic>Nanobdella</jats:italic> including the only species with a validly published name, <jats:italic>Nanobdella aerobiophila</jats:italic> . Based on phylogenetic analysis, the genera <jats:italic>“Nanopusillus”</jats:italic> and “ <jats:italic>Nanoclepta</jats:italic> ” should be included in this family. Although these genera were described earlier than <jats:italic>Nanobdella</jats:italic> , their names have not been validly published. Thus, these genera cannot serve as the nomenclatural types of the higher taxa. Members of this family are obligately symbiotic, only growing in coculture with their specific archaeal hosts. Depending on their hosts, they grow under aerobic or anaerobic conditions. Cells are small cocci and occur singly or attached to the cell surface of their hosts. The genome size of the members of this family range between 0.58 and 0.67 Mb. </jats:p> <jats:p> <jats:italic>DNA G + C content (mol%)</jats:italic> : 24.2–32.2. </jats:p> <jats:p> <jats:italic>Type genus</jats:italic> : <jats:bold>Nanobdella</jats:bold> Kato et al. 2022 <jats:sup>VP</jats:sup> . </jats:p> </jats:sec> <jats:sec> <jats:title>Taxonomic and Nomenclature Notes</jats:title> <jats:p> According to the List of Prokaryotic names with Standing in Nomenclature (LPSN), the taxonomic status of the family <jats:ext-link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="https://lpsn.dsmz.de/family/nanobdellaceae"> <jats:italic>Nanobdellaceae</jats:italic> </jats:ext-link> is: correct name (last update, February 2025) <jats:sup>*</jats:sup> . </jats:p> <jats:p> <jats:bold>LPSN classification:</jats:bold> <jats:ext-link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="https://lpsn.dsmz.de/domain/archaea"> <jats:italic>Archaea</jats:italic> </jats:ext-link> / <jats:ext-link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="https://lpsn.dsmz.de/kingdom/nanobdellati"> <jats:italic>Nanobdellati</jats:italic> </jats:ext-link> / <jats:ext-link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="https://lpsn.dsmz.de/phylum/nanobdellota"> <jats:italic>Nanobdellota</jats:italic> </jats:ext-link> / <jats:ext-link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="https://lpsn.dsmz.de/class/nanobdellia"> <jats:italic>Nanobdellia</jats:italic> </jats:ext-link> / <jats:ext-link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="https://lpsn.dsmz.de/order/nanobdellales"> <jats:italic>Nanobdellales</jats:italic> </jats:ext-link> / <jats:ext-link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="https://lpsn.dsmz.de/family/nanobdellaceae"> <jats:italic>Nanobdellaceae</jats:italic> </jats:ext-link> </jats:p> <jats:p> The family <jats:italic>Nanobdellaceae</jats:italic> can also be recovered in the Genome Taxonomy Database (GTDB) as <jats:ext-link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="https://gtdb.ecogenomic.org/tree?r=f__Nanopusillaceae"> <jats:italic>f__Nanopusillaceae</jats:italic> </jats:ext-link> (version v220) <jats:sup>**</jats:sup> . </jats:p> <jats:p> <jats:bold>GTDB classification:</jats:bold> <jats:ext-link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="https://gtdb.ecogenomic.org/tree?r=d__Archaea"> <jats:italic>d__Archaea</jats:italic> </jats:ext-link> / <jats:ext-link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="https://gtdb.ecogenomic.org/tree?r=p__Nanoarchaeota"> <jats:italic>p__Nanoarchaeota</jats:italic> </jats:ext-link> / <jats:ext-link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="https://gtdb.ecogenomic.org/tree?r=c__Nanoarchaeia"> <jats:italic>c__Nanoarchaeia</jats:italic> </jats:ext-link> / <jats:ext-link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="https://gtdb.ecogenomic.org/tree?r=o__Nanoarchaeales"> <jats:italic>o__Nanoarchaeales</jats:italic> </jats:ext-link> / <jats:ext-link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="https://gtdb.ecogenomic.org/tree?r=f__Nanopusillaceae"> <jats:italic>f__Nanopusillaceae</jats:italic> </jats:ext-link> </jats:p> <jats:p> <jats:sup>*</jats:sup> <jats:mixed-citation publication-type="journal"> <jats:string-name> <jats:surname>Meier‐Kolthoff</jats:surname> </jats:string-name> et al. ( <jats:year>2022</jats:year> ). <jats:source>Nucleic Acids Res</jats:source> , <jats:volume>50</jats:volume> , <jats:fpage>D801</jats:fpage> – <jats:lpage>D807</jats:lpage> ; DOI: <jats:ext-link xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" xlink:href="10.1093/nar/gkab902">10.1093/nar/gkab902</jats:ext-link> </jats:mixed-citation> </jats:p> <jats:p> <jats:sup>**</jats:sup> <jats:mixed-citation publication-type="journal"> <jats:string-name> <jats:surname>Parks</jats:surname> </jats:string-name> et al. ( <jats:year>2022</jats:year> ). <jats:source>Nucleic Acids Res</jats:source> , <jats:volume>50</jats:volume> , <jats:fpage>D785</jats:fpage> – <jats:lpage>D794</jats:lpage> ; DOI: <jats:ext-link xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" xlink:href="10.1093/nar/gkab776">10.1093/nar/gkab776</jats:ext-link> </jats:mixed-citation> </jats:p> </jats:sec>