The spelling of the word "anisian" is unusual, as it is not often encountered in everyday use. The phonetic transcription of this word can be written as /əˈnɪziən/, with the stress falling on the second syllable. The word refers to a geological time period that occurs within the Middle Triassic era. Anisian conditions saw the emergence of many new species of reptiles and marine creatures, and it is an important part of our understanding of Earth's prehistoric past.