タマキガイ属 (Glycymeris)・リュウキュウサルボウ属 (Anadara) の化石にみられる多毛類による穿孔

概要

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The shells of some species of the genera Glycymeris and Anadara, collected from the Pliocene and Quaternary stratum are bored sometimes in form of an elongate tube. These tubes are about 1.5mm-0.8mm in diameter. They usually consist of two canals, running parallel side by side, and connect with each other at the distal end. Their openings to the outer surface locate near the posterior shell margin. The penetration of this type is confined to larger shells at each locality (Text-figs.). Shells of recent forms of Glycymeris and Anadara are also penetrated in the same fashion. The boring organisms seem to be polychaetes. The penetration of fossil specimens would be caused by the same organisms to recent ones. It is observed often in the thin sections that the shell layer beneath these tubes is thicker than that of the other area. From these facts it can be assumed that the increase of secretory activity of a mantle occurred locally due to the stimulation of penetration by parasite organisms.
日本貝類学会の論文
1973-12-31