Simple axial proboscis
Simple axial proboscis: A sac-like proboscis relying on fluid pressure from the coelom for eversion. There is no particular development of musculature or glands. The worms tend to have reduced septa in the anterior part of the body allowing the contruction of the posterior part of the body to exert considerable force on the proboscis because of the free movement of the coelomic contents. Muscles associated with a thickened first septum (gular membrane) and the proboscis are used for retraction.
- [[SimpleAxialProboscis|Simple axial proboscis]]