Candidatus Haloectosymbiotes riaformosensis

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Formal styling
Candidatus Haloectosymbiotes riaformosensis” corrig. Filker et al., 2014 emend. Filker, 2021
Effective publication
Filker et al., 2014
Filker, 2021 from “Candidatus Halectosymbiota riaformosensis” (sic)
Emended in
Filker, 2021
SeqCode status
Automated discovery
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Filker, et al (2014): Rod-shaped archaeon with a length-width ratio of 3:1. Epibiont on the scuticociliate Platynematum salinarum (Ciliophora, Scuticociliatia). Phylogenetically related to Hlm. pelagica on the basis of the 16S rRNA gene sequence (accession number: KF736828), and identifiable with the specific FISH oligonucleotide probes Hesr1-2 (Hesr1: 5′-TTCACTAGGTGTTCCTCTCG-3′; Hesr2: 5′-GACTCTTCGGAGTGGTGTTAT-3′) and the archaeal-specific probe Arch915 (5′-GTGCTCCCCCGCCAATTCCT-3′). Identified as an inhabitant on the surface of a P. salinarum population, isolated from the Ria Formosa solar saltern in Faro, Portugal. Anisomycin experiments point to an obligate symbiotic relation with its host, whereas no free-living forms have been observed. Uncultured so far.

Filker (2021): Ca. Halectosymbiota riaformosensis was observed to live as ectosymbiont on a halophile scuticociliate, which was isolated from a thalassohaline solar saltern pond (12% salinity) in Faro, Portugal. Comparisons of 16S rRNA gene sequences showed that Ca. Halectosymbiota is phylogenetically affiliated to the genera Halolamina (sequence similarity to H. pelagica: 87%) and Halobaculum (sequence similarity to H. magnesiiphilum 85%). Based on scanning electron microscopy micrographs and fluorescence in situ hybridization, cells are rod-shaped and approximately 1.8 × 0.6 μm in size. Cells are densely covering the surface of the host, with approximately 0.52 epibiotic cells per μm2. Free-living forms were not observed. Candidatus Halectosymbiota riaformosensis is sensitive to anisomycin. Known habitats are aquatic hypersaline environments.
Archaea » “Euryarchaeota” » Halobacteria » Halobacteriales » Halobacteriaceae » Candidatus Halectosymbiota » Candidatus Haloectosymbiotes riaformosensis
Candidatus Halectosymbiota


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Citation Title
Filker, 2021, Bergey's Manual of Systematics of Archaea and Bacteria Candidatus Halectosymbiota
Emended this name
Filker et al., 2014, Systematic and Applied Microbiology “Candidatus Haloectosymbiotes riaformosensis” (Halobacteriaceae), an archaeal ectosymbiont of the hypersaline ciliate Platynematum salinarum
Effective publication

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