There are no ampullae, seminal vesicles or coagulating glands. The cupula is located within the ampullae of each of the three semicircular canals. Near the barbels, the longnose sawshark possesses a pair of ampullae of Lorenzini. Like all sharks, hammerheads have electroreceptory sensory pores called ampullae of Lorenzini. The semicircular canals contain several ampullae, with some oriented horizontally and others oriented vertically. Three of these are the cristae located in the ampullae of the semicircular canals. Lateral canals lead from these radial canals, ending in ampullae. The ampullae are connected to suckerlike podia. Contraction of the ampullae causes the podia to stretch as water is brought into them. Monza ampullae made in Byzantine Palaestina Prima. The electric field sensors of sharks are called the ampullae of Lorenzini. In sharks, the ampullae of Lorenzini are electroreceptor organs. The ampullae pores are plainly visible as dark spots in the skin. Like its shark relatives, the stingray is outfitted with electrical sensors called ampullae of Lorenzini. Suckers and ampullae are absent from the tube feet.