How many letters does the top answer for “any flagellated aerobic bacteria having a spirally twisted rodlike form” have?

The most common answer is spirilla (8 letters).

Crossword clue: any flagellated aerobic bacteria having a spirally twisted rodlike form

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

spirilla 8 letters wn-def

any flagellated aerobic bacteria having a spirally twisted rodlike form

spirillum 9 letters wn-def

any flagellated aerobic bacteria having a spirally twisted rodlike form