The term "phyletic" refers to the evolutive process that leads to a species differentiation. Therefore, synonyms for "more phyletic" are words that express the idea of a greater level of evolutionary advancement or complexity. Some options would be: advanced, developed, evolved, improved, enhanced, sophisticated, high-level, complex, refined, and matured. In biology, the term "phylogenetic" is also associated with the concept of evolutionary development. Therefore, synonyms like "more phylogenetic" or "more evolutionary" could also be appropriate choices to describe organisms that have undergone significant biological changes throughout their evolution.