Definition: Given a sentence in English, provide an equivalent paraphrased version from the original that retains the same meaning.
Input: Neptunea alexeyevi is a species of sea snail , a true gastropod mollusk in the Buccinidae family , the whelks navy .

Neptunea alexeyevi is a species of sea snail , a true gastropod mollusk in the family Buccinidae , the marine whelks .