Jewel Top Shell

Prothalotia pulcherrima

Prothalotia pulcherrima is a marine gastropod mollusk characterized by its elongated, thick, and solid shell, which typically ranges from 12 mm to 20 mm in length. The shell is imperforate and features an acutely conical shape with a straightly conical spire. The apex is subacute, and the nearly flat whorls display broad flat spiral ribs that are often purplish-crimson with narrow white markings. The small oval aperture is brilliantly iridescent and less than half the length of the shell, bordered by a line of intense crimson. This species is endemic to Australia, found off the coasts of Victoria, Western Australia, and Northern Tasmania, primarily in shallow waters. It inhabits depths less than 40 meters, with most occurrences shallower than about 20 meters, commonly in rocky or coral reef environments. The jewel top shell feeds on algae and is known for its grazing behavior. While specific breeding habits are not detailed in the sources, many marine gastropods typically reproduce through external fertilization, laying eggs in the water column or on substrates. Encountering this species while diving can be intriguing, as divers may spot them clinging to rocks or coral, showcasing their distinctive shell patterns.