How many letters does the top answer for “the primitive form of fin, like that of ceratodus.” have?

The most common answer is archipterygium (14 letters).

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Crossword clue: the primitive form of fin, like that of ceratodus.

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

archipterygium 14 letters web-def

The primitive form of fin, like that of Ceratodus.

Pattern

Data: SCOWL, igerman98, RLA-ES, Grammalecte, br.ispell · frequency: OpenSubtitles (see Data & licenses)