NZ Mollusca

Janthina exigua (Lamarck, 1822)

Janthina exigua
A pelagic species washed up after rough weather, 16mm
Janthina exigua
Washed up on beach after storm, Far North, NZ, 15mm
Classification: Mollusca - Gastropoda - Caenogastropoda - Ptenoglossa - Epitoniidae - Janthina
Family: EPITONIIDAE
Size/Grows to: Height 23mm, Width 21mm
Distribution: Pelagic. Commonly washed ashore on west coast beaches [A.C.F.M.]
Notes: Violet Snail. Pelagic, feeds mainly on colonial cnidarians (Physalia, Velella, Porpita). Strong and widely spaced growth ridges
Some known Localities
  • Pegasus Bay, Canterbury, NZ
  • Tapotupotu Bay, Far North, NZ
  • Cape Maria van Diemen, Far North, NZ
  • Taupiri Bay, Northland, NZ
  • Bream Bay, Whangarei, Northland, NZ
  • Whatipu, Manukau Entrance, Auckland, NZ
  • Between Karioitahi Beach & Maioro Gap, SW of Waiuku, Auckland, NZ *2
  • Matata Beach, Bay of Plenty, NZ
  • Chatham Islands, NZ
  • Stewart Island, NZ
References:
  • Beu, A.G. 2017: Evolution of Janthina and Recluzia (Mollusca: Gastropoda: Epitoniidae), Records of the Australian Museum, 63(3) (p.191)
  • Powell, A.W.B. 1979: New Zealand Mollusca: Marine, Land and Freshwater Shells, Collins, Auckland (p.254)

Note: Localities are approximate, and represent only some of the known localities for the species.

*2 © Museum of New Zealand Te Papa Tongarewa CC BY-NC-ND