Felimare bilineata is a species of sea slug, a dorid nudibranch, and a member of the family Chromodorididae. These marine gastropod mollusks are notable for their vibrant coloration and intricate patterns, which play a role in their defense mechanism against predators.

Felimare bilineata can be found in the waters of the Comunidad Valenciana, among other regions. It is commonly known for its colorful and striking appearance, which contributes to the biodiversity of the local marine ecosystem.

• Appearance: Felimare bilineata is distinguished by its elongated, soft body adorned with vivid colors, typically featuring shades of blue along with two prominent lines running longitudinally. The intricate patterns are often bordered by lines of contrasting colors.
• Habitat: This species inhabits rocky substrates and is frequently found in underwater environments where it feeds on sponges. Its presence is an indicator of a healthy underwater ecosystem.
• Behavior: As a nudibranch, it is a slow-moving creature that glides gracefully over surfaces. The bright coloration is a warning to potential predators of its toxicity.
• Diet: Felimare bilineata primarily feeds on specific types of sponges, which also contribute to its toxic chemical defenses.

The vivid characteristics and ecological role of Felimare bilineata make it a fascinating subject of study and a stunning element of the marine life in the Comunidad Valenciana.