Agathotoma castellata
Agathotoma castellata is a species of sea snail, a marine gastropod mollusk in the family Mangeliidae.
Description
The length of the shell attains mm, its diameter mm.The white, oblong, turreted shell has 6 to 7 whorls, including two in the protoconch. This shell is elegantly formed, with whorls that are narrower at the base than above, giving it a turreted appearance. The prominent plicate ribs are particularly notable, with the penultimate rib on the body whorl significantly distant from the rib that forms the outer lip. The ribs are slightly extended at the upper end, giving the whorls a castellated appearance, and they are continuous up the spire in all four examples examined. The aperture is narrow, and the siphonal canal is short and truncate.