Europa looks like Mithras at first glance, and yet her story is more similar to that of Persephone. Europa is associated with Demeter but she's also known as a lunar cow, the moon and the cow both being traditionally feminine symbols in Indo-European culture.
For comparison, I've collected in this post links to various myths surrounding moon and cattle deities.
Europa (mythology) Wikipedia
The name of Europa far-hang.blogspot.com
Europa and Zeus by N.S. Gill, About.com Guide
Sacred Cow – Cows and Cow-Goddesses Mythical Creatures World
A Celtic white cow goddess: Boann - The Clannada na Gadelica
River Boyne and the Milky Way Boyne Wisdom
Milky Way (mythology) - Wiki
Moons of Jupiter Buzzle.com
The primeval cow of Norse mythology: Auðumbla - Wiki
"Europa: Full Moon, the Great Goddess as Mother of all Europe. White Moon Cow. Garlanded white bulls were sacrificed to this Lunar Cow Goddess in Crete and Mycenae from a very early date." Goddesses of Ancient Greece, Avatars of the Goddess infinite8design.com
"...the cow came to symbolise the mother of the pharaoh. The cow was also a solar icon, where Nut carried the sun across the sky on her back, when she was in cow form." Animals and the Gods of Ancient Egypt
Bull (mythology) - Wiki
Egyptian mythology - Indopedia