polymastia

Polymastia lorum is a species of demosponge belonging to the family Polymastiidae.

The image depicts Polymastia pachymastia, often called "aggregated nipple sponge", a species found off the coast of northern California.

Fleischer's syndrome is an extremely rare congenital anomaly characterized by displacement of the nipples, occasional polymastia, and hypoplasia of both kidneys.

Polythelia refers to the presence of an additional nipple alone while polymastia denotes the much rarer presence of additional mammary glands.

The presence of more than two nipples is known as polythelia and the presence of more than two complex mammary glands as polymastia.

Dendy, Arthur, and Ridley, Stuart O. (1886) On Proteleia sollasi, a new genus and species of monaxonid sponges allied to Polymastia.

Dr. G. Gregory Gallico 3d, plastic surgeon at Massachusetts General Hospital, said both polythelia, the condition of having extra nipples, and polymastia, the condition of having extra breast tissue, are viewed as harmless.