任一种海栖软体动物，如滨螺，长有螺旋形的壳。

Any of various Marine gastropods, such as a periwinkle, having a spiral shell.

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直形壳鹦鹉螺类化石产出状态的研究等表明三道坎组古流向是自北而南的。

Study of the attitudes of the fossil orthocone nautiloids indicate that the paleocurrents were from north to south during the deposition of the Sandaokan Formation.

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