岩手県・大槌湾から再発見されたキタノカラマツガイ

概要

論文の詳細を見る
The population of boreal shiphonariid limpet, Siphonacmea oblongata (Yokoyama, 1926), was rediscovered from Otsuchi Bay, Iwate Prefecture. It has never been collected since the first record of live specimens from Akkeshi, Hokkaido by Hade (1958). The limpet is characterized by : thinly depressed shell with faintly tanned, nearly translucent hue ; smooth filmy periostracum ; surface sculpture only with delicate growth lines ; apex centrally positioned ; early shell slightly coiling ; protoconch-teleoconch demarcation unclear ; limpet form completed at shell length of 0.5mm by expansion of aperture ; muscle scar inverted C-shape with left side open and inner central area thickened by brownish callus in fully mature specimens. The distribution of the Recent population is ranged from Eastern Hokkaido (Akkeshi) to Sanriku area (Otsuchi), although the fossil records are known from Sado Island (Sea of Japan). The habitat of this species is limited to the surface of seagrass, Zostera marina.
日本貝類学会の論文
1998-04-30