Reassessing North Eastern Atlantic‐Mediterranean species of <i>Trapania</i> (Mollusca, Nudibranchia)

Trapania is the second largest genus belonging to family Goniodorididae, of which most species are reported from Indo-Pacific waters. To date, there nine distributed along temperate coasts East Atlantic Ocean and Mediterranean Sea: fusca, graeffei, hispalensis, lineata, maculata, orteai, pallida, sanctipetrensis tartanella. However, validity some these has been problematic due uncertain taxonomic characteristics used for differentiation species. The a very uniformly external morphology similar internal anatomy. As consequence, features commonly differentiate have colour pattern body radula. In present study, we perform morphological molecular revision Atlantic-Mediterranean Trapania. Morphological analyses include dissections scanning electron microscope photographs radulae, labial cuticles penises. Molecular work includes phylogenetic, delimitation haplotype network analyses. Our results bring doubt on so far, suggesting that richness North Eastern overestimated. T. lineata pallida shown belong same taxa, with as senior synonym.