This is the Cone Snail (Conus terebra), a medium to large marine gastropod in the family Conidae. It is characterised by its elongated, conical shell, typically reaching lengths between 43 mm and 100 mm. The shell’s pale, ash-coloured exterior often displays faint bands, and may show a soft violet hue near the base. The surface is finely striated, with the interior aperture usually appearing white or faintly violet.

Location:
Tropical Indo-Pacific region, including the Red Sea and coastal waters off Northern Territory, Queensland, and Western Australia.

Average Size:
Shell length typically ranges from 43 mm to 100 mm.

Family:
Conidae (Cone Snails)

Species:
Conus terebra (also historically referred to by synonyms in older taxonomic literature; note that cone snail taxonomy is undergoing frequent revision).

Shell Characteristics:
The shell is elongate and conical, with fine striations across its surface. Its pale, ashen colouring is marked by faint bands, often with a subtle violet flush towards the base. The aperture interior is white or tinged with violet.

Ecological Role:
Conus terebra is a predatory and venomous species, preying primarily on small marine invertebrates, particularly polychaete worms. It uses a specialised, harpoon-like radular tooth to deliver venom, immobilising prey before consumption.

Venom:
The venom of cone snails contains a complex mixture of toxins (conotoxins). While Conus terebra is not typically considered dangerous to humans, caution is advised when handling live specimens, as envenomation is possible.

Conservation Status:
It is not considered threatened, although like many marine species, local populations may be affected by habitat degradation or collection for the shell trade.