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Xylophaga indica , a deep-sea xylophagous bivalves, was found to have colonized in Holocene buried pine wood(Radiocarbon dating:3,093±45 yBP)which emerged by the Niigata Chuetsu-oki Earthquake in 2007 on the 70-100 m deep seabed 5-8 km offshore Izumozaki, Niigata Prefecture, Japan. The maximum shell length was 10.8mm. And the shell of X. indica was dated as modern by radiocarbon dating. These results suggest that the ancient wood might have been partly exposed on the surface of the seabed before the earthquake. The ancient buried wood, previously identified as Pinus parviflora or P. parviflora var. pentaphylla , was analyzed chemically. The contents of holocellulose and lignin of the ancient wood were 18.4 and 55.2%, respectively. The holocellulose content is significantly lower than that of extant pine wood, approximately 75%. Although it is known that X. indica burrows in and ingests woody substrates, this is the first information concerning such low holocellulose content of woody substrate against X. indica .

mokuzai hozon

Wood chemical study on the relationship of Holocene buried pine wood salvaged from seabed of the Sea of Japan and wood-feeding clam, &lt;i&gt;Xylophaga indica&lt;/i&gt;, colonized in the wood