 The study examined the locomotion of a pligia, a mollusk species, which uses a petal rolling wave as its primary form of movement. This rolling wave is generated by a single petal ganglion, which contains a cluster of 20 to 30 P1 root neurons, P1NS, which are motor neurons. These neurons fire during two distinct phases of the rolling wave, with the majority of them firing during the second phase. Additionally, two classes of petal interneurons, class 1 and class 2, were identified, with class 1 being responsible for generating the first phase of the rolling wave, while class 2 is responsible for the second phase. Finally, computational cluster analysis revealed that these two phases are controlled by two separate clusters of P1NS, with one cluster being responsible for the first phase and the other for the second phase. This article was authored by Huying Wang, Kuyu, Zhiyang, and others.