Typhlosole

• (n.) A fold of the wall which projects into the cavity of the intestine in bivalve mollusks, certain annelids, starfishes, and some other animals.
Found on http://thinkexist.com/dictionary/meaning/typhlosole/

Typhlosole

A typhlosole is an internal fold of the intestine or intestine inner wall. Typhlosoles occur in bivalve mollusks, lampreys and some annelids and echinoderms. In earthworms, it is a dorsal flap of the intestine that runs along most of its length, effectively forming a tube within a tube, and increasing the absorption area by that of its inner surfa...
Found on http://en.wikipedia.org/wiki/Typhlosole
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