it is a wave like movement. due to the rhythmic movement of diagonal muscles the move wave like.
during ciliary movement in dugesia it holds the head in slanded pasition. since the cilia are absent in head region the place the head a little raised. thus in such ciliary movement head movements are different from tail movement.
Dugesia aenigma was created in 1984.
Dugesia sicula was created in 1948.
Dugesia notogaea was created in 1998.
Dugesia tubqalis was created in 2012.
Dugesia golanica was created in 1991.
Dugesia sagitta was created in 1861.
Dugesia japonica was created in 1964.
a quick movement
Dugesia will exibit negative phototaxis. Look it up in a zoology book. here is an article as well. http://www.helium.com/items/1079086-the-observation-of-dugesia-in-response-to-light-and-gravity
The triceps relaxes slowly. This prevents a "jerky' movement.
a rapid, jerky movement of the eyes between positions of rest.