Inhabiting the midwater regions of the oceans, tomopterids are a family of pelagic, gelatinous polychaetes whose motion is highly adapted to navigating the water column. Their locomotion is governed by the motion of their parapodia, a soft, gelatinous paddle-like appendage attached to the base of the body. Lined up along the body in the horizontal plane, the metachronal paddling of the parapodia drive the swimming behavior of tomopterids. The motion of the individual parapodium is a result of the interaction between the swimming musculature and the elastic properties of the parapodia. In this study, we develop a model for the individual parapodia and allow its motion to emerge as a result the muscle actuation on the flexible parapodia. The fully-coupled fluid structure interaction problem is solved using an adaptive and parallelized version of the immersed boundary method (IBAMR). We will then compare the results of the simulations with the motion of the parapodia.