The new ellipsocephaloid trilobite species Kingaspidoides spinirecurvatus has a spectacular morphology because of a unique set of two long and anteriorly recurved spines on the occipital ring and the axial ring of thoracic segment 8. Together with the long genal spines this whimsical dorsally directed spine arrangement is thought to act as a non-standard protective device against predators. This is illustrated by the body posture during different stages of enrolment, contrasting with the more sophisticated spinosities seen in later trilobites, which are discussed in brief. Kingaspidoides spinirecurvatus from the lower–middle Cambrian boundary interval of the eastern Anti-Atlas in Morocco has been known for about two decades, with specimens handled as precious objects on the fossil market. Similar, but far less spectacular, spine arrangements on the thoracic axial rings are known from other ellipsocephaloid trilobites from the Anti-Atlas of Morocco and the Franconian Forest region of Germany. This suggests that an experimental phase of spine development took place within the Kingaspidoides clade during the early–middle Cambrian boundary interval.

新的椭圆形三叶虫物种Kingaspidoides spinirecurvatus具有壮观的形态，这是因为在枕骨环和胸椎节段8的轴环上有独特的两个长而向前弯曲的长刺棘，再加上长的长刺，认为这是异想天开的背向脊柱排列用作抵抗天敌的非标准保护设备。这在入学的不同阶段通过身体姿势来说明，这与后面的三叶虫中看到的更为复杂的棘突形成了鲜明的对比，这将在后面进行简要讨论。金丝雀摩洛哥东部反阿特拉斯山脉的下-中寒武纪边界带距今已有约二十年的时间，标本作为化石市场上的珍贵物品被处理。从摩洛哥的《反阿特拉斯》和德国的法兰克森林地区的其他椭圆形三叶虫中也可以看到类似的，但远不那么壮观的脊椎排列在胸轴环上。这表明，在寒武纪的早期至中期，金斯皮德斯山脉的一个进化阶段发生了脊柱发育的实验阶段。