<i>Thermorudis pharmacophila</i> sp nov., a novel member of the class <i>Thermomicrobia</i> isolated from geothermal soil, and emended descriptions of <i>Thermomicrobium roseum</i>, <i>Thermomicrobium carboxidum</i>, <i>Thermorudis peleae</i> and <i>Sphaerobacter thermophilus</i>