Typhosole is a structure found in the intestines of certain invertebrates, particularly earthworms and some other annelids. It is a longitudinal fold of the intestinal wall that increases the surface area for absorption of nutrients. This adaptation enhances the efficiency of digestion and nutrient uptake, allowing these organisms to maximize the benefits from their food.
The typhosole of an earth worm is the mid-dorsal groove of the intestine. It is folded and functions to increase the surface area of the intestine to aid in digestion.
Its function is to increase intestine surface area for more efficient absorption of digested nutrients. In different earthworm families, the typhlosole appears to have multiple origins.