Penion lineatusPenion lineatus is a species of medium-sized marine snail or whelk, belonging to the true whelk family Austrosiphonidae. It was described in 2018.DescriptionAdult shells are between 68 mm and 172 mm in length. The shell protoconch is cream coloured and the teleoconch is covered in yellow or brown bands.DistributionPenion lineatus is endemic to waters surrounding the Three [Kings Islands] and Cape Reinga north of mainland New Zealand.