Turbonilla magnacastanea is a species of sea snail, a marine gastropod mollusk in the family Pyramidellidae, the pyrams and their allies.[1]
The shell grows to a length of 18 mm. As is the case with most mollusks, Turbonilla Magnacastanea carries their shall by selecting one from nature, attaching to it, and carrying it as a portable home. Distinguishing features are still being discovered and categorized.
This species occurs in the Pacific Ocean off the Solomon Islands.