How many letters does the top answer for “(biology) a taxonomic group ranking between a phylum and below a class or subclass” have?

The most common answer is superphylum (11 letters).

Crossword clue: (biology) a taxonomic group ranking between a phylum and below a class or subclass

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

superphylum 11 letters wn-def

(biology) a taxonomic group ranking between a phylum and below a class or subclass