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Ignicoccus hospitalis forms many cell surface appendages, the Iho670 fibers (width, 14 nm; length, up to 20 [micro]m), which constitute up to 5% of cellular protein. They are composed mainly of protein Iho670, possessing no homology to archaeal flagellins or fimbrins. Their existence as structures different from archaeal flagella or fimbriae have gone unnoticed up to now because they are very brittle. doi: 10.1128/JB.00858-09

The genetic identity of the Rhodopirellula isolates on the species level and the habitat sizes of the species are understood by developing a multilocus sequence analysis (MLSA) and are applied to the strain collection. The MLSA results are calibrated with a DNA-DNA hybridization (DDH) study and transmission electron microscopy (EM) is performed on some isolates to support the identification as Planctomycetes and to visualize morphological differences between strains.