Research news on monotremes (order)

Monotremes are an order of egg-laying mammals (Order Monotremata) characterized by a suite of primitive and derived traits, including oviparity, a cloaca, and electroreception in some taxa. They comprise extant families such as Ornithorhynchidae (platypus) and Tachyglossidae (echidnas), restricted to Australasia. Monotremes exhibit a combination of reptile-like and mammalian features: they possess fur and mammary glands but lack nipples, secrete milk onto specialized skin areas, and have a distinctive shoulder girdle and skull morphology. Their reproductive biology involves laying leathery-shelled eggs, brief external incubation, and prolonged post-hatching maternal care, making them critical for studies of mammalian evolution and developmental biology.