The spelling of the word "tetraotus" can be explained using the International Phonetic Alphabet (IPA). "Tetraotus" is pronounced /tɛˈtrɑʊtəs/, with four syllables. The "t" at the beginning is pronounced with a soft "t" sound, followed by "e" which is pronounced short in the English language. The third syllable, "aou," is pronounced with a sound like "ow" in English. The final syllable, "-tus," which is the Latin suffix for a genus, is pronounced with a hard "t" sound.
Tetrotus.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.