subphylum(n = noun.group) - (biology) a taxonomic group ranking between a phylum and a class;
is a kind of taxon, taxonomic category, taxonomic group
is a member of phylum

subphylum, n. (pl. subphyla) Biol. a taxonomic category below a phylum.

subphylum cephalochordata, subphylum craniata, subphylum pentastomida, subphylum tunicata, subphylum urochorda, subphylum urochordata, subphylum vertebrata