implacental

implacental

A kangaroo is an example of an implacental mammal.

Definition

  1. Adjective:

    • Lacking a placenta: "implacental" refers to an animal that does not possess a placenta during gestation. This term is used in zoology to describe certain mammals that give birth without a placental connection between mother and offspring.

  2. Noun:

    • An implacental mammal: "implacental" can also function as a noun to denote a mammal belonging to the group of animals that lack a placenta, such as monotremes (e.g., the platypus) and marsupials (e.g., kangaroos).
Usage Examples

  • Adjective:

    • The platypus is an implacental mammal, laying eggs instead of giving birth to live young. (Describes a mammal without a placenta.)
    • Marsupials are considered implacental because their young develop in a pouch after a short gestation. (Explains the biological characteristic.)

  • Noun:

    • Implacentals include monotremes and marsupials, which have unique reproductive systems. (Refers to animals in the group.)
    • The study focused on the evolutionary history of implacentals compared to placental mammals. (Denotes the category of mammals.)
Advanced Usage

  • "Implacental development": The process by which an embryo develops without a placenta, often relying on a yolk sac or external pouch.

    • The implacental development of the echidna involves a leathery egg that hatches outside the mother's body. (Describes the specific reproductive method.)

  • "Implacental group": A taxonomic classification of mammals that lack a placenta.

    • The implacental group is divided into monotremes and marsupials. (Refers to the broader biological category.)
Variants and Related Words

  • Implacentate (adj/n): an alternative spelling of "implacental," with the same meaning.

    • The implacentate marsupial carries its young in a pouch. (Synonymous usage.)

  • Placental (adj): possessing a placenta; the opposite of implacental.

    • Humans are placental mammals, relying on a placenta for nutrient exchange. (Contrasting term.)
Synonyms

  • Non-placental: lacking a placenta; a less formal synonym.

    • Non-placental mammals rely on alternative methods of fetal nourishment. (Equivalent meaning.)

  • Aplacental: another term meaning without a placenta, often used interchangeably.

    • Aplacental species like the kangaroo have a short gestation. (Synonymous usage.)
Related Idioms
  • No direct idioms: "Implacental" is a technical term in zoology and does not appear in common idiomatic expressions.
Phrasal Verbs
  • No phrasal verbs: "Implacental" is a specialized adjective and noun, not associated with phrasal verb constructions.