english: This vast domain of hidden biodiversity is increased still further by the dark matter of the biological world of bacteria, which within just the last several years still were known from only about 6,000 species of bacteria worldwide.
non_english: Dit uitgestrekte domein van verborgen biodiversiteit neemt nog steeds toe met de donkere materie van de biologische wereld van de bacteriën, die we in de paar afgelopen jaren nog maar kenden van slechts 6.000 bacteriesoorten, wereldwijd te tellen.