How many letters does the top answer for “used of mollusks, especially gastropods, as snails etc.” have?

The most common answer is univalve (8 letters).

Crossword clue: used of mollusks, especially gastropods, as snails etc.

1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

univalve 8 letters wn-def

a class of mollusks typically having a one-piece coiled shell and flattened muscular foot with a head bearing stalked ey