Adjective
relating to a type of sexual reproduction in which the gametes are dissimilar in some respect (as size or shape)
Source: WordNetCertain araphid species, that is pennate diatoms without a raphe, have been documented as anisogamous and are, therefore, considered to represent a transitional stage between centric and raphid pennate diatoms, diatoms with a raphe. Source: Internet
Syzygy, when it occurs, involves markedly anisogamous gametes. Source: Internet