结节龙科和甲龙亚目
甲龙亚目恐龙最早出现于晚侏罗世,但直到白垩世才进入全盛时期。最先开始进化的是结节龙科的恐龙,很快就占据了整北半球。结节龙科的恐龙身体沉重,行动缓慢,是一种植食性动物,并以犄角和骨板作为防护甲。在白垩纪末期,结节龙科被 甲龙亚目所代替。甲龙亚目的恐龙具有更加坚韧的装甲,而且尾巴的末端上还长了一个骨棒。
甲龙亚目恐龙最早出现于晚侏罗世,但直到白垩世才进入全盛时期。最先开始进化的是结节龙科的恐龙,很快就占据了整北半球。结节龙科的恐龙身体沉重,行动缓慢,是一种植食性动物,并以犄角和骨板作为防护甲。在白垩纪末期,结节龙科被 甲龙亚目所代替。甲龙亚目的恐龙具有更加坚韧的装甲,而且尾巴的末端上还长了一个骨棒。
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