- protostyle
-
n. [Gr. protos, first; stylos, piller](MOLLUSCA)The stiff mucous rod of early mollusks that transports the food string along the esophagus into the stomach; the forerunner of the crystalline style.
Online Dictionary of Invertebrate Zoology. A.R. Maggenti and S.L. Gardne. 2005.