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 图6-27Boysidia(Boysidia)fengxianensisChen,1999ActaZootaxonomicaSinica.,24(2):127,f.1a,b,c.模式标本产地陕西凤县高桥铺河边。形态特征贝壳微小,右旋,壳质薄,易碎,有光泽,呈圆锥形,有41/2个螺层。各螺层均膨胀,螺旋部高,呈圆锥形,体螺层膨大。壳面呈黑 (共 707 字) [阅读本文] >>