Diwal or the angelwing clam (Pholas orientalis) is indigenous to the coastal waters of Negros Occidental and Iloilo but particularly abundant in Capiz province (particularly in towns of Sapian, Ivisian, Panay, Pontevedra, and Pilar). Roxas City is likewise blessed with flourishing diwal to substantiate its title as the "seafood capital" of the Philippines. Found in burrows about half a meter in nearshore areas with muddy sand substratum, diwal has sweet, tender juicy taste.

Portal, T. (2002, February 27). "We want our diwal back". Panay News, p. 13