During the IceDivA2 expedition on RV Sonne in November 2021, specimens of a megafaunal scaphopod species were collected by Agassiz trawl (AGT) and imaged by an Ocean Floor Observation System (OFOS) in the Labrador Sea Basin at abyssal depths of 3380 to 3390 m. Morphological, morphometric and genetic analyses revealed an undescribed species of the scaphopod genus Fissidentalium, which was formally described as Fissidentalium aurae sp. nov. by Linse and Neuhaus in 2024. In-situ images of RV Sonne''s OFOS system revealed a shallow inbenthic lifestyle of the scaphopod when it is associated with an anemone, leaving Lebensspuren in the soft abyssal sediments and enabled density estimation of the species.

This dataset provides data for 1) Fissidentalium aurae sp. nov. presence record from AGT, shell morphometric measurements, and museum curation numbers (.csv), 2) images files (54) of specimens'' shells, soft parts and radula (.jpg), 3) SEM images files (28) of radula and shell structure (.tif), 4) in-situ OFOS images (917) (.jpg), 5) Fissidentalium presence assessment of in-situ OFOS images (.csv).

Katrin Linse is part of the British Antarctic Survey Polar Science for Planet Earth Programme funded by The Natural Environment Research Council (NERC) [NC-Science]. Fieldwork during expedition SO286 on RV Sonne was funded by the Federal Ministry of Education and Research (BMBF) through the IceDivA2 grant GPF 21-2_052 given to PIs Saskia Brix, Katrin Linse, Pedro Martinez Arbizu and Alexander Kieneke. Jenny Neuhaus was supported through grant GPF 21-2_052 as well as the iAtlantic project funded by EU/HORIZON 2020, Blue Growth (grant agreement No 818123).