The Hippocampus dahli have a low coronet (crown) and display sexually dimorphic color patterns.
Individuals usually have relatively smooth bodies, with low, reduced spines and a low coronet. The word stems from the Old French coronete, a diminutive of co(u)ronne ("crown"), itself from the Latin corona (also "wreath"), from the Ancient Greek  (korone, "garland, wreath"). This species displays sexually dimorphic colour patterns. 
