The size of young Carcinoscorpius rotundicauda is similar to the size of the nonpoisonous Tachypleus tridentatuscause.It is very easy to be confused and easy to eat by mistake.

• 据说中国鲎无毒，可以食用，但中国鲎的幼体和有剧毒（河豚毒素）的圆尾鲎非常相似，对鲎的分类不太清楚的人，容易因混淆造成误食而中毒。