Delonovolva Aequalis

Simnia take pigment from their hosts;
a red simnia transplanted to a purple host
will thereafter deposit purple shell.

The same animal has a different shell color when living
on a Golden or a Red Gorgonian, as seen below:

Lens: 60mm
Film: Kodak E-100 VS
Location: San Clemente Island, California
Depth: 35 feet/11 meters
© Garry McCarthy