Definition

Noun: - A taxonomic subclass of mammals: "Subclass Eutheria" refers to the major group of mammals characterized by giving birth to live young that have undergone a relatively advanced stage of development inside the mother's body, nourished by a placenta. This group excludes monotremes (egg-laying mammals) and marsupials (mammals that typically have a pouch).

Usage Examples

• Noun:
  • Humans, dogs, and whales all belong to the subclass Eutheria.
  • The evolutionary success of subclass Eutheria is largely attributed to the development of the placenta.

Advanced Usage

• In scientific classification: The term is used in formal biological taxonomy to categorize and study mammalian evolution and relationships.
  • The fossil record provides crucial evidence for the early diversification of subclass Eutheria.

Variants and Related Words

• Eutherian (adj): Pertaining to or characteristic of this subclass.
  • Eutherian mammals have a distinct reproductive system.
• Placental mammal (n): A common synonym for a member of the Eutheria.
  • The placental mammal group is another name for subclass Eutheria.

Synonyms

• Placental mammals: The group of mammals whose embryos are nourished by a placenta during gestation.

Related Terms (Conceptual)

• Theria: The larger subclass that includes both Eutheria (placental mammals) and Metatheria (marsupials).
• Metatheria: The subclass containing marsupials, which are distinct from eutherians.
• Prototheria: The subclass containing monotremes, the egg-laying mammals.

Noun

1. all mammals except monotremes and marsupials