Pholads are known to attack rocks of various kinds by tunnelling or rasping holes in similar manner as teredo does in wood. Among rock borers, Parapholas concamerita Desh., is reported to occur and to be fairly common on the rocky coasts of the Philippines. This species measures 3 inches or more in length. Ablan (1938) noted Phlolas orientates Gmelin living in colonies, burrowing in the sandy mud in Pontevedra, Negros Occidental. Many of this species were removed from the soil 9 to 22 inches deep.
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