Taxonomy
- Kingdom: Animalia
- Phylum: Mollusca
- Class: Gastropoda
- Order: Neogastropoda
- Family: Conidae – cone snails
- Genus: Conus
- Species: Conus arenatus (Bruguière, 1792)
Common name: Sand cone
Description
Conus arenatus possesses a conical shell ranging from 30 mm to 70 mm in length. The shell is generally smooth and glossy, exhibiting a pale‑cream to light‑brown ground colour that may be covered with fine, sand‑like granules or faint axial streaks. The aperture is narrow, and the spire is moderately elevated. Like other cone snails, the animal has a well‑developed venom apparatus consisting of a radular tooth capable of delivering neurotoxic peptides.
Distribution and habitat
- Geographic range: Indo‑Western Pacific region, including the eastern coast of Africa (Somalia to South Africa), the Red Sea, the Arabian Peninsula, the Indian Ocean islands, Southeast Asia (e.g., Thailand, Malaysia, Philippines), northern Australia, and parts of the South Pacific.
- Habitat: Sandy or muddy substrates in shallow marine environments, typically from the intertidal zone down to depths of about 30 m. The species is often found in areas with moderate wave action where it can burrow partially in the substrate.
Ecology and behavior
Conus arenatus is a predatory marine gastropod. It hunts small marine organisms—primarily polychaete worms and occasionally small fish—by employing a harpoon‑like radular tooth to inject a complex venom mixture (conotoxins) that immobilizes prey. The snail then extracts the prey with its proboscis. Like other cone snails, C. arenatus is nocturnally active, emerging from the sand to hunt.
Human interactions
The venom of C. arenatus is capable of delivering a painful sting to humans, though envenomation is generally less severe than that of larger piscivorous cone species (e.g., Conus geographus). Medical attention is advised if stung. The aesthetically pleasing shell is collected by shell enthusiasts, contributing to its presence in the ornamental shell trade.
Conservation status
There is no specific IUCN Red List assessment for Conus arenatus; it is currently considered a species of least concern owing to its relatively wide distribution and lack of major documented population declines. However, localized threats such as habitat degradation, coastal development, and over‑collecting for the shell trade could impact regional populations.
References
- Bruguière, J. (1792). Encyclopédie Méthodique. Paris.
- Tucker, J. K., & Tenorio, M. J. (2009). Systematic Classification of Recent and Fossil Conidae. ConchBooks.
- World Register of Marine Species (WoRMS), 2023 entry for Conus arenatus.
Note: All information presented reflects the consensus of current scientific literature and taxonomic databases.
