日本産ハマユウガイ科二枚貝

概要

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The Japanese species of the family Clavagellidae, a tube dwelling bivalve, are revised and referred to eight species in three genera, Clavagella, Humphreyia, and Brechites. Among the eight species, five are endemic to Japan and adjacent areas. They are Clavagella (Stirpuliniola) ramosa, Humphreyia (Nipponoclava) kanazawensis, H. (N.) yokoyamai, H. (N.) gigantea, and Brechites (Brechites) nagahamai. The other three species were originally described from and are mainly distributed in Australian and/or Indian waters. They are Clavagella (Bryopa) lata, C. (Dacosta) australis, and Brechites (Foegia) novaezelandiae, of which the second species is recorded for the first time in Japan. In addition to the above eight species, two specifically indeterminable clavagellids are also herein reported as Clavagella species indet. and Humphreyia (Nipponoclava) species indet. Humphreyia (Nipponoclava) kanazawensis (early Middle Micoene), H. (N.) gigantea (late Miocene and Holocene, ) and H. (N.) yokoyamai (late Pliocene to early Pleistocene) are easily distinguishable from each other by their shell-sheath size. Humphreyia (N.) yokoyamai is occasionally preserved in life position. Clavagella (Stirpuliniola) ramosa ranges in time from Pleistocene to Holocene. Clavagella (Bryopa) lata, C. (Dacosta) australis, Brechites (Brechites) nagahamai, and B. (Foegia) novaezelandiae, are known in recent sediments of Japan.
国立科学博物館の論文
1994-03-22