| They also do not have the degree of cephalization seen in the mandibulates. |
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| In some flatworms, the process of cephalization has included the development in the head region of light-sensitive organs called ocelli. |
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| This, in turn, would have been a factor in the evolution of cephalization. |
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| Cephalopods are unique among the invertebrates in the degree of cephalization and cerebralization attained. |
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| Scyphozoan polyps and medusae exhibit no cephalization and contain no brain, but in some species, light-sensitive eyespots are located along the bell margin of the medusa. |
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| Apparently, cephalization in the complex body plans of mandibulates has resulted in complex regulation of both the anterior and posterior expression boundaries in the head. |
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| Complete cephalization of the ventral nerve cord occurs in a few Heteroptera where all the ventral ganglia, including the subesophageal, unite into a single ganglionic centre. |
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