甲虫或甲壳虫是<a href="./?mention=鞘翅目">鞘翅目</a>(Coleoptera)昆虫的俗称。该目是昆虫纲中乃至动物界种类最多、分布最广的。甲壳虫类昆虫体型大小差异甚大,<a href="./?mention=体壁">体壁</a>坚硬;<a href="./?mention=口器">口器</a>咀嚼式;<a href="./?mention=触角">触角</a>形状多样,10-11节;前胸发达,中胸<a href="./?mention=小盾片">小盾片</a>外露;前翅为角质硬化的鞘翅,<a href="./?mention=后翅">后翅</a>膜质;幼虫为寡足型,少数为无足型。常见昆虫(俗称):<a href="./?mention=天牛">天牛</a>、<a href="./?mention=瓢虫">瓢虫</a>、<a href="./?mention=萤火虫">萤火虫</a>、<a href="./?mention=屎壳郎">屎壳郎</a>、<a href="./?mention=斑蝥">斑蝥</a>、<a href="./?mention=独角仙">独角仙</a>、<a href="./?mention=吉丁虫">吉丁虫</a>、<a href="./?mention=芫菁">芫菁</a>、<a href="./?mention=金龟子">金龟子</a>、<a href="./?mention=锹形虫">锹形虫</a>、<a href="./?mention=叩头虫">叩头虫</a>、<a href="./?mention=龙虱">龙虱</a>、<a href="./?mention=米象">米象</a>。