Tethyidae

Tethyidae is a family of sea slugs, specifically dorid nudibranchs, marine gastropod molluscs in the clade Euctenidiacea. These animals are found in various oceans around the world.

Members of the Tethyidae family are characterized by their distinctive morphology, often featuring large, ornate oral hoods used for filter feeding or capturing prey. They typically lack a true radula as their feeding strategy relies on engulfing or filtering particulate matter. Their bodies are often translucent or brightly colored, providing camouflage or warning coloration.

The Tethyidae family includes several genera, such as Tethys and Melibe. The classification within the family has been subject to revision based on morphological and molecular data.

These nudibranchs are of interest to marine biologists and ecologists due to their unique feeding mechanisms and role in marine ecosystems.