Contributions to Zoology, 86 (4) – 2017Kennet Lundin; Tatyana Korshunova; Klas Malmberg; Alexander Martynov: Intersection of historical museum collections and modern systematics: a relict population of the Arctic nudibranch Dendronotus velifer G.O. Sars, 1878 in a Swedish fjord
Materials and methods

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Morphological analysis

The external and internal morphology was studied under a stereomicroscope and using a full-frame digital camera (Nikon D-810). The buccal mass of each specimen was extracted and processed in 10% sodium hypochlorite solution to extract the radula and the jaws. The jaws of each species were analysed under a stereomicroscope and then photographed. The radulae were coated and examined and photographed using a scanning electron microscope (CamScan). The reproductive systems were also examined using the stereomicroscope.