This taxonomic class contains the only synapsids that are living today.
This taxonomic class contains the only synapsids that are living today. Ancestors of this class include cynodonts, which emerged in the late Permian. This class was initially classified into the groups Prototheria, Metatheria, and Eutheria. Some members of this class release prolactin from their pituitary gland. This class of organisms experienced a radiation in the Paleogene period after an extinction event that ended the Cretaceous period and the age of reptiles. The only order within this class that lays eggs is Monotremata. This class also includes marsupials and placentals. For 10 points, name this class of animals, distinguished by having fur and milk-producing glands.
This taxonomic class contains the only synapsids that are living today.
Mammalia [or mammals]