RT Journal Article SR Electronic(1) A1 Burggraf, S. A1 Huber, H. A1 Stetter, K. O.YR 1997 T1 Reclassification of the Crenarchaeal Orders and Families in Accordance with 16S rRNA Sequence Data JF International Journal of Systematic and Evolutionary Microbiology, VO 47 IS 3 SP 657 OP 660 DO https://doi.org/10.1099/00207713-47-3-657 PB Microbiology Society, SN 1466-5034, AB Abstract A phylogenetic analysis of all validly published members of the Crenarchaeota, including several new isolates from our laboratory, suggests three orders within this archaeal kingdom. The Thermoproteales consist of both the rod-shaped, hyperthermophilic, neutrophilic representatives of the Thermoproteaceae and the members of the new family Thermofilaceae. The Sulfolobales harbor all thermoacidophilic, coccoid organisms. The neutrophilic, hyperthermophilic cocci are members of a new order tentatively named “Igneococcales.” This order comprises two families, the Desulfurococcaceae, characterized by maximal growth temperatures of up to 100°C, and the new family Pyrodictiaceae, for which optimal growth occurs at temperatures above 100°C., UL https://www.microbiologyresearch.org/content/journal/ijsem/10.1099/00207713-47-3-657