Habitat: it is a pelagic species.
Distribution: it is a cosmopolite species. It can be found all over the Mediterranean where it is more common than in the Atlantic. Imaged shells: the adult imaged shells were collected in the Tuscan Archipelago (Italy), the juvenile imaged shells were collected at Atlit (Israel), at 1400 m depth.
Notes: shell nautiloid, globose, sculpture missing. Aperture subtriangular. Carina, cartilagineous, thin and irregular, well visible in the second half of the last whorl only where it becomes larger and it reaches the aperture (important diagnostic characteristic). Juvenile stage, easily definable, presents itself with one rolling up calcareous planispiral involute, globose, aperture bent rather narrow. External lip incised in the median part by one crack wide and deep. External surface covered by thin spiral lines parallel and prominent, a little bit sin-uous and separated by regular intervals. Generally juvenile stage is colourless, while teleconch is dark brown in colour. Usually into the sediment patterns there can be found juvenile stages which are calcareous ones, while the cartilagineous part of adult shells is easily destroyed.The adult specimens average measures are around 6-7 mm in diametre, but they can reach one centimetre too.