eutherian

Examples of eutherian in the following topics:

• Living Mammals

  • Living mammals can be classified in three subclasses: eutherian, metatherians and monotremes.
  • Living mammals can be classified into three major classes: eutherians, monotremes, and metatherians.
  • The eutherians, or placental mammals, and the metatherians, or marsupials, together comprise the clade of therian mammals.
  • Marsupials differ from eutherians in that there is a less complex placental connection.
  • Eutherians are the most widespread of the mammals, occurring throughout the world.

• Evolution of Mammals

  • Later, the eutherian and metatherian lineages separated.
  • Metatherians are the animals more closely related to the marsupials, while eutherians are those more closely related to the placentals.
  • Eutherians are distinguished from noneutherians by various features of the feet, ankles, jaws, and teeth.
  • One of the major differences between placental and nonplacental eutherians is that placentals lack epipubic bones, which are present in all other fossil and living mammals (marsupials and monotremes).
  • Since Juramaia, the earliest-known eutherian, lived 160 million years ago in the Jurassic, this divergence must have occurred in the same period.

• Blastocyst Formation

  • The trophoblast combines with the maternal endometrium to form the placenta in eutherian mammals.

• Characteristics of Mammals

  • While male monotremes and eutherians possess mammary glands, male marsupials do not.
  • Eutherian mammals also possess a specialized structure that links the two cerebral hemispheres, called the corpus callosum.

• White Matter of the Cerebrum

  • The corpus callosum (Latin: "tough body"), also known as the colossal commissure, is a wide, flat bundle of neural fibers beneath the cortex in the eutherian brain at the longitudinal fissure.