phyletically

In a morphological study of the sporophytes and gametophytes of several species of Microsorum, it became apparent that at least two phyletically distinct groups of species existed in the genus.

I have proposed that, on the reasonable assumption that resources remained more or less constant for the time in question, the price exacted for (phyletically) growing larger was to become rarer, thereby increasing the probability of extinction (Hallam, 1975).

The females are among the most variable Morphids and three principal forms may be distinguished, including the normal (most commonly occurring), predominantly brown-yellow female, analogous to that of mellinia, and probably the ancestral form, still recalling the Brassolids, thus phyletically the oldest.