Yohoia Stuffed Toy Sidneyia: Predator of the Seafloor This arthropod from the Cambrian period has been turned into a plush. Light blue soft plush that is expertly sewn down to the last antennae, leg, and segment. You can see the craftmanship that goes into each leg and segment and in the fanned tail. A high quality and unique plush. Sidneyia is another strange arthropod from the Cambrian era found in Burgess shale in British Columbia.This carnivorous creatured crawled the sea floor and ate molluscs and small crustaceans and trilobites. Sidneyia was named after the discoverer Charle Walcott's son, Sidney, who helped him on his expeditions.