NZ Mollusca

Janthina umbilicata d'Orbigny, 1840

Janthina umbilicata
From Tom Bowling Bay, Far North, 16mm
Janthina umbilicata
Washed up on northern beaches, 15mm
Classification: Mollusca - Gastropoda - Caenogastropoda - Ptenoglossa - Epitoniidae - Janthina
Family: EPITONIIDAE
Size/Grows to: Height 16mm, Width 15mm
Distribution: Pelagic. Kermadec Islands and Northern NZ [K.A.]
Notes: Pelagic, feeds mainly on colonial cnidarians (Physalia, Velella, Porpita). Fine and closely spaced growth ridges
Some known Localities
  • Raoul Island, Kermadec Islands
  • 13 km N of Great Island, 508 metres, Three Kings Islands, NZ
  • South Cavalli Seamount, 850-840 metres, ENE of North Cape, NZ *2
  • Tom Bowling Bay, Far North, NZ (Fossil)
  • Te Werahi Beach, Cape Maria van Diemen, Far North, NZ
  • Ocean Beach, Whangarei Heads, Northland, NZ
  • Uretiti Beach, Bream Bay, Whangarei, Northland, NZ
  • Karioitahi Beach, SW of Waiuku, Auckland, NZ
  • Between Karioitahi Beach & Maioro Gap, SW of Waiuku, Auckland, NZ *2
  • Papamoa Beach, Bay of Plenty, NZ
  • Boulder Bay, Moutohora (Whale) Island, Bay of Plenty, NZ *2
References:
  • Beu, A.G. 2017: Evolution of Janthina and Recluzia (Mollusca: Gastropoda: Epitoniidae), Records of the Australian Museum, 63(3) (p.196)
  • Oliver, W.R.B. 1914: The Mollusca of the Kermadec Islands, Transactions and Proceedings of the New Zealand Institute, 47 (p.525)

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