A thermophilic species, " T . erraticum " is found principally on dry heathland, exposed to the sun.
3.
Another thermophilic species, " Sulfolobus acidocaldarius ", is able to undergo HGT . " S . acidocaldarius " can exchange and recombine chromosomal markers at temperatures up to 84 o C . UV exposure induces pili formation and cellular aggregation . and by DNA damaging chemicals.
4.
The discovery of " Thermococcus celer " played an important role in re-rooting the tree of life when it was discovered that " T . celer " was more closely related to methanogenic Archaea than to other phenotypically similar thermophilic species Several type strains of " T . celer " have been identified : Vu13, ATCC 35543, and DSM 2476.
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