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硕步甲（学名：Carabus davidis）也称大卫布甲、大卫硕布甲，一种分布于中华人民共和国湖南、江西和福建等地区的鞘翅目昆虫，隶属于步行虫科大步甲属（步甲属、步行虫属）切鞘亚属（Apotomopterus）。[1]
成虫体长39.1～41.1毫米。前胸背板呈蓝绿色带金属光泽，密布沟纹。鞘翅为绿色至红色的渐变色带金属光泽，覆满平行的行距，三条主行距特化为连续均匀的椭圆形突起，第三行距退化。雄性鞘翅末端的切鞘现象不明显，而雌性切鞘明显。[1]
本种目前发现7个亚种：[2]
- Carabus davidis davidis Deyrolle & Fairmaire, 1878
- Carabus davidis helmutschuetzei Kleinfeld, 1995
- Carabus davidis meihuaensis Deuve & Tian, 2000
- Carabus davidis neodavidis Kleinfeld & Schütze, 2001
- Carabus davidis perornans Deuve, 2002
- Carabus davidis viridithoracis Kleinfeld & Schütze, 2001
- Carabus davidis yizhangensis Kleinfeld, 2002
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