[4] A study that collected mitochondrial DNA from various Colias butterfly species found that Z. eurydice had decreased divergence from the ingroup, highlighting how closely related these two genera are.

[8] Male Z. Eurydice butterflies have an iridescent pigment found in their dorsal forewings due to light reflecting chitin structures and this has been associated with mating success.

The wings are covered with scales to assist "flight aerodynamics and heat insulation" and the overall body contains "setae hairs that sense vibration and touch.

It took 43 years, a determined 4th grade class, and Fresno Assemblyman Kenneth Maddy to have the California Dogface butterfly designated as the state insect.

For global status-most recently updated in 2019-classifies Zerene eurydice as G4, indicating "apparently secure.

"[12] The reasons behind Zerene eurydice being "apparently secure" are, "although this species is uncommon and local, and is a subject to some threats, they persist in a relatively large number of occurrences.

However, the long-term trend for Zerene eurydice results in a decline of less than 30% because of "the large scale of habitat conversion that has taken place in the California Coast and Transverse Ranges in the 20th century.