For Junior Synonym we have a term and definition in Zoological.

If there are only two synonyms, the most recently described one is the junior synonym; if there are more than two synonyms, the junior synonyms are all but the oldest described one which is the senior synonym, e.g., Apiomorpha nux Fuller, 1896 is the junior synonym and A. pharetrata Scharder, 1863 is the senior synonym.
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