A Mormyromast, a type of electroreceptor found only in Mormyrid fishes (en)
Ampullae of Lorenzini, found in several basal groups of fishes, are jelly-filled canals connecting pores in the skin to sensory bulbs. They detect small differences in electrical potential between their two ends. (en)
The electroreceptive ampullae of Lorenzini evolved from the mechanosensory lateral line organs of early vertebrates. They are seen here in the head of a shark. (en)
A knollenorgan, a tuberous electroreceptor of weakly electric fish. RC=receptor cell; b.m.=basal membrane; n=nerve. (en)