Similar Ones Are Not Related and Vice Versa—New <i>Dendronotus</i> Taxa (Nudibranchia: Dendronotidae) from the North Atlantic Ocean Provide a Platform for Discussion of Global Marine Biodiversity Patterns
2023
Tatiana Korshunova | Viktor V. Grøtan | Kjetil B. Johnson | Torkild Bakken | Bernard E. Picton | Alexander Martynov
One new species of the genus <i>Dendronotus</i> (Nudibranchia: Dendronotidae) is described from Norway and Northern Ireland, as well as from the adjacent North Sea, and one new subspecies of <i>Dendronotus arcticus</i> is described from Norway by applying a combination of fine-scale morphological and molecular phylogenetic data. The present case demonstrates multilevel morphological and molecular similarities and differences considering on the one hand a grouping of three similar looking sympatric taxa (<i>D. yrjargul</i>, <i>D. arcticus gartensis</i> n. subsp. and <i>D. keatleyae</i> n. sp.), and on the other hand two different looking apparently allopatric subspecies (<i>D. arcticus arcticus and D. arcticus gartensis</i> n. subsp.). The type species of the genus, <i>D. frondosus</i>, which is the commonest dendronotid in Norway and the United Kingdom, consistently demonstrates substantial molecular and fine-scale morphological differences from <i>D. keatleyae</i> n. sp. The present study, apart from providing purely taxonomic information, also provides new data for a broad discussion of global biodiversity patterns.
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