2.1.27 (HL)—Limits of traditional taxa

Traditional ranks organize names, but rank labels do not measure equal evolutionary distance because lineages diverge unevenly.

Use domain-to-species ranks for communication, then use clades and evidence for evolutionary relationships.

Two families can have the same rank name while representing very different amounts of evolutionary divergence.

No; compare the actual cladogram or sequence evidence.

A taxonomic rank is useful for naming, not a ruler of evolutionary time.