Janthina exigua (Lamarck, 1822)
Height 23mm, Width 21mm
Violet Snail, Marine, Pelagic, feeds mainly on colonial cnidarians (Physalia, Velella, Porpita). Commonly washed ashore on ocean beaches
Tropical and temperate seas. West Norfolk Ridge, Raoul, Three Kings and North Islands, northern South Island, Stewart Island and Chatham Islands, from 0-1000m

Janthina globosa Swainson, 1826
Height 32mm, Width 26mm
Violet Snail, Marine, Native - Non-endemic, Pelagic, feeds mainly on colonial cnidarians (Physalia, Velella, Porpita)
Tropical and temperate seas. Raoul Island and northern North Island as far south-east as Waihau Bay, from 0-530m

Janthina janthina (Linnaeus, 1758)
Width 40mm, Height 38mm
Violet Snail, Marine, Native - Non-endemic, Pelagic, feeds mainly on colonial cnidarians (Physalia, Velella, Porpita)
Tropical and temperate seas. West Norfolk Ridge, Raoul, Three Kings, North, South, Stewart and Chatham Islands, from 0-805m

Janthina umbilicata d'Orbigny, 1840
Height 20mm, Width 17mm
Marine, Pelagic, feeds mainly on colonial cnidarians (Physalia, Velella, Porpita)
Tropical and temperate seas. Raoul Island and northern North Island as far south as Motuhora Island