a spiral shell in the deep

Size
Length: 5–10 cm
Lifespan
Unknown.
Diet
Carnivorous. Feeds on plankton and small crustaceans during nocturnal migration.
Habitat
Deep ocean waters worldwide, with vertical migration patterns in open ocean.
Range
Washes up on beaches throughout New Zealand, particularly after storm events.
Endemism
Vagrant
Main Threats
None significant. Natural mortality leads to shell deposition on shorelines.
Population
Occasional visitor to shores. Washes up on beaches after storms and strong currents.
Conservation Status
data_deficient
Human Risk
harmless
Handling Note
small deep-sea species found only as washed-up shells
Conservation Note
Cephalopod species not included in the 2021 NZTCS marine invertebrates assessment; conservation status currently unassessed nationally.
Te Ao Māori
The spiral shell of the ram's horn squid is known to beachcombers and collectors in New Zealand. While not having a specific Māori name or traditional use, it is recognised as a taonga of the sea. Its presence on beaches connects people to the deep ocean, serving as a tangible link to the mysterious life beyond the continental shelf.
The tide brings strange gifts. Sometimes it is driftwood. Sometimes it is a white, spiral shell. This is the ram's horn squid, or Spirula spirula. It is not a true squid, nor is it a snail. It is a unique cephalopod with an internal, coiled shell. The animal itself is small and rarely seen. It lives in the deep ocean, migrating vertically each night to feed on plankton and small crustaceans. The shell is made of aragonite and is divided into chambers. The squid uses these chambers to control its buoyancy, adjusting the gas content to rise or fall in the water column. When the animal dies, the shell floats to the surface and eventually washes ashore. In New Zealand, these shells are found on beaches around the country, particularly after storms. They are prized by collectors for their perfect spiral shape. The ram's horn squid is a vagrant, not a resident. It visits our shores only in death. Yet it is a reminder of the vastness of the ocean and the connections between deep water and the coast. It is a traveller from the abyss. And it leaves a trace. The numbers are incidental to beachcombers.