Randy,
It seems that one of Dr. Shimek's former articles is haunting the files
I noticed the following passage in the current article:
nd retraction of the introvert is absolutely characteristic of sipunculans. Generally, all one ever sees of these worms is the stately extrusion or retraction of the introvert, and it appears as if it is unfolding or retracting from within itself, as, indeed, it is. No other animal extends or retracts its body in such a manner, so if this type of behavior is observed, it has to be from a sipunculan.
(I already found a sipunculan reference in Dr Ron's current article as well-since fixed)
Allen
It seems that one of Dr. Shimek's former articles is haunting the files

nd retraction of the introvert is absolutely characteristic of sipunculans. Generally, all one ever sees of these worms is the stately extrusion or retraction of the introvert, and it appears as if it is unfolding or retracting from within itself, as, indeed, it is. No other animal extends or retracts its body in such a manner, so if this type of behavior is observed, it has to be from a sipunculan.
(I already found a sipunculan reference in Dr Ron's current article as well-since fixed)
Allen