Madrellidae

Madrellidae is a family of sea slugs, specifically nudibranchs, belonging to the clade Dexiarchia. They are marine gastropod molluscs in the order Nudibranchia. Madrellidae is a relatively small family, encompassing several genera and species. These nudibranchs are characterized by their elongated body shape and the presence of cerata, dorsal appendages that can function in respiration and defense. The arrangement and morphology of the cerata are important taxonomic features used to distinguish different genera and species within the family.

Madrellidae are generally found in temperate and tropical waters. They are carnivorous, typically feeding on hydroids and other small invertebrates. The coloration of Madrellidae can vary greatly, often exhibiting bright and contrasting patterns which may serve as aposematic signals, warning potential predators of their toxicity.

The classification within Madrellidae has been subject to revision based on morphological and molecular data. Further research is ongoing to better understand the phylogenetic relationships within this family and its relationship to other nudibranch groups.