Monotremes

Monotremes, only five species of which exist, all from Australia and New Guinea, lay eggs. They have one opening for excretion and reproduction called the cloaca.
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Monotremes
These primitive mammals produce a shelled egg like their reptilian ancestors. Only three species exist today: two species of spiny anteater (echidna) and the duckbill platypus. [View (48K)]
Marsupials ...
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monotremes: the egg-laying mammals that produce milk.
morula: a solid mass of cells that develops about six days after fertilization of an egg cell.
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monotremes Egg-laying mammals; e.g., the spiny anteater and the duck-billed platypus.
morph A distinct phenotypic variant within a population.
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monotremes
and marsupials). Embryo and fetus are nourished by a placenta. They are viviparous (producing young alive rather than lying eggs), have a long period of gestation and the young is born immature.
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Shared derived characters that are regarded as homologous are called synapomorphies, e.g. the presence of mammary glands in all three lineages of mammals (monotremes, marsupials and placentals).
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