Still Many to Be Named: An Integrative Analysis of the Genus Dendronotus (Gastropoda: Nudibranchia) in the North Pacific Revealed Seven New Species

In this paper, we report on the discovery of hidden biodiversity genus Dendronotus (Gastropoda: Nudibranchia) in bathyal areas North Pacific (the Sea Okhotsk and Kuril Islands). We also test different scenarios expansion to deeper waters. An integrative analysis was implemented based morphological data (light microscopy SEM) molecular data, which included phylogenetic four markers (COI, 16S, H3, 28S), species delimitation analyses, ancestral area reconstruction. Our results indicated presence seven new science, five are described herein. The reconstructions show that these members lineages. Ancestral reconstruction indicates shallow-water origin genus, while invasion deep waters occurs independently multiple times.