Know or don't | Board 47

With the progressive development of cephalization, "the ???? incorporates more and more of the adjacent segments into its structure, so that in general it may be said that the higher the degree of cephalization the greater is the number of segments composing the ????".

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How to play

The following text is an excerpt from an actual Wikipedia page.

Your task is to find the Wikipedia page, by looking for a word which spreads across a sequence of two to three other non related words.

For example:

The word "word" appears in the text "Know or don't"

The word might have slight spelling differences.

Good luck!