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MYTILOIDA

The leading edge of the husk of Mytiloida connects with a stomach relationship linearly, and cannot be distinguished, and an external form of the husks is lengthwise drop of water form for the posterior border that the husk is curvilinear from back relationship and "stomach relationship" and three sides of the posterior border. The husk top is on the tip of the husk, and the swelling of the husk is weak, and there is not the decoration of the husk list.

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