A Grammatical Dictionary of Botanical Latin

-zoan: an adjective ending relating to the NL taxonomic noun-ending -zoa, q.v., but see note below -zoanus,-a,-um (adj.A), -zoaneus,-a,-um (adj.A), -zoicus,-a,-um (adj.A);

- bryozoanus,-a,-um (adj.A), bryozoaneus,-a,-um (adj.A), bryozoicus,-a,-um (adj.A): bryozoan, of or relating to Bryozoa; similarly echinozoanus (adj.A), relating to echinozoa; hydrozoanus (adj.A); protozoanus (adj.A).

NOTE: in WIII spermatozoa is a singular noun synonymous with spermatozoon; spermatozoan, an English adjective = 'of or relating to spermatozoa,' whether the taxonomic name (a plural noun) or in reference to a single spermatozoon.

NOTE: the etymology of -zoa in this instance derives from a New Latin noun (WIII). Since WIII also indicates -zoa is synonymous with the more classically consistent noun ending -zoon, then here the adjective will be treated as -zo + Latin endings -aceus,-a,-um (adj.A), -icus,-a,-um (adj.A) or -anus,-a,-um (adj.A).