Please help me with a writing question

zchristinay
Tue, 19 Apr 2011 11:06:36 +0000

(Among) the (most widespread of) marine animals, starfishes and sea urchins (inhabit) all seas (except that of) the polar regions.
The answer is “except that of” and the correct one should be “except those of”
But what about “the most widespread of”?I think we should delete “of”