The species Harpago arthriticus belongs to the class Gasteropoda, order Littorinimorpha and family Strombidae. It is a species of marine snail that inhabits the waters of the Indian and Pacific oceans, where they live just below the low tide line, in sandy plains of coral reefs that are covered by algae and seagrasses.
Adult specimens can reach a size of 20 cm in length. Its calcareous shell has 6 long extensions along the base, which are somewhat pointed. In the posterior part of the shell, we find 3 of these extensions, the central one more or less straight, and two others on each side of the central one that arch slightly towards the central axis of the shell. In the central part of the shell is the fourth extension, the shortest of the 6 that the animal has. Finally, in the most anterior region of the shell, we find the last two extensions, one on each side and both arched towards their respective exteriors. On the dorsal part of the shell, Harpago arthriticus presents several grooves and striations formed by contiguous protuberances. The color of the shell of this animal is whitish, with numerous brown stripes and spots. On the underside of the shell of this species, we find the thick lips that border its opening. These are usually yellowish or yellowish-pink, with numerous purple or dark brown spots that form an oiled pattern.
This is a very nocturnal species, which can be found resting peacefully inside its shell during daylight hours. During the night, the muscular foot of the specimens of Harpago arthriticus emerges from the shell, to look for food, which being an omnivorous species, its nutritional sources are very varied.Photos: