primigenial
/ˌprʌɪmɪˈdʒiːnɪəl/adjective
1That is generated or produced first; belonging to the earliest stage of existence; original, primitive, primary.
2 Zoology. Designating or relating to a species or variety regarded as an evolutionary ancestor of a related modern form.
Origin
Early 17th century; earliest use found in William Fulbecke (1560–?1603), lawyer and historian. From classical Latin prīmigenius first-born, original, primitive + -al.