Prosipho antarctidis
Prosipho antarctidis is a species of sea snail, a marine gastropod mollusk in the family Prosiphonidae, the true whelks.
Description
This shell measuries 7.5 mm high and 3 mm wide, and consists of 6 whorls. The first 1.5 whorls are smooth, relatively large, and rounded. The remaining whorls are covered with strong spiral ridges. Typically, four ridges are visible on each whorl, with a weaker one sometimes appearing below the suture on the lower whorls. The body whorl has a ridge where the suture attaches, along with several other more or less distinct ridges on the underside and the relatively short, straight siphonal canal. The shell as a whole is tall and turreted, with whorls that are rounded and increase in size uniformly. The aperture is oval with a fairly short siphonal canal.The radula has a central plate that is longer than it is wide, with three equally sized, pointed teeth that span its entire width. The lateral plates have a moderately wide cutting edge with five cusps. The three middle cusps are larger than the ones at the ends. The base of the lateral plate extends outward and forward into a fairly long process.