Micro-CT was performed to a gastropod (Nassarius nitidus ). This specimen was frozen in liquid nitrogen. For this specimen, no contrast agent was used. Scan was performed with a Skyscan 1172 at a voltage of 70kV and 141μΑ with an an aluminium filter of 0.5mm for a half rotation of 180o . This specimen was scanned at the highest camera resolution with an exposure time of 6455ms. This scan was performed for the assesment of the effects of ocean acidification (http://acidoc.lifewatchgreece.eu/). Specimen was provided by Nafsika Papageorgiou and scanned by Eva Chatzinikolaou.