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Untangling the nudibranch species complex Jorunna tomentosa with a study on the diversity of sea slugs in Hordaland
Hardly any dedicated study has focused for the last 40–50 years in the sea slug fauna of southern Norway including the county of Hordaland. Moreover, preliminary data have pointed towards the possible occurrence of multiple species in the common nudibranch Jorunna tomentosa. The latter species depicts subtle variations on its colour pattern that have been so far interpreted as part of the species variability. In this study molecular and morphological methods will be used to compare the various morphotypes of Jorunna tomentosa including samples from Norway, the type locality in northern France, and other European localities. Additionally, a review of the sea slug diversity in Hordaland will be carried out based on literature records and novel samples.