Giant Mangrove Whelk (Terebralia palustris)

"Terebralia palustris", common name the giant mangrove whelk, is a species of brackish-water snail, a gastropod mollusk in the family Potamididae. This tropical species which inhabits mangrove environments of the Indo-West Pacific region, has the widest geographic distribution amongst the potamidids extending from eastern Africa to northern Australia.