Syrinx aruanus, common name the Australian trumpet or false trumpet, is a species of extremely large sea snail measuring up to 91 cm long and weighing up to 18 kg. This is the largest gastropod species in the world. It was long thought to be under Melongenidae.

This is the largest Recent shelled gastropod, and the largest shelled gastropod by weight. However, the largest shell-less gastropod or slug is Aplysia vaccaria, a giant sea hare known as the California black sea hare. The largest A. vaccaria has been measured at 99 cm in length and weighing in at almost 14 kg. An extremely large species of fossil gastropod is Campanile giganteum.

The overall length of the shell of S. aruanus is up to 91 cm. Juvenile shells show a long tower-shaped protoconch or embryonic shell of 5 whorls, which is usually lost in the adult.

This species occurs in the northern half of Australia and adjacent areas, including eastern Indonesia and Papua New Guinea. These giant snails live on sandy bottoms in the intertidal zone and the sublittoral down to about 30 m. Where it has not been overfished, this snail is locally common.

This carnivorous species is specialized for feeding on polychaete worms in the genera Polyodontes (Acoetidae), Loimia (Terebellidae) and Diopatra (Onuphidae).[7] It may seem unlikely for such a large gastropod to feed on worms, but worms in the family Acoetidae do include the largest polychaetes, with a length of over 1 meter. These worms live in tubes; Syrinx aruanus can reach them with its proboscis, which has a length of up to 250 mm.

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