monotreme

(noun)

a mammal that lays eggs and has a single urogenital and digestive orifice; only the echidnas and platypuses

Related Terms

  • allantois
  • amnion
  • chorion

Examples of monotreme 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.
    • Monotremes form their sister clade.
    • Monotremes are unique among mammals as they lay eggs rather than giving birth to live young.
    • Additionally, monotremes have no teeth.
  • Evolution of Mammals

    • Synapsids from this period include Dryolestes (more closely related to extant placentals and marsupials than to monotremes) as well as Ambondro (more closely related to monotremes).
    • 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).
  • Characteristics of Amniotes

    • Most mammals do not lay eggs (except for monotremes).
  • Characteristics of Mammals

    • While male monotremes and eutherians possess mammary glands, male marsupials do not.
Subjects
  • Accounting
  • Algebra
  • Art History
  • Biology
  • Business
  • Calculus
  • Chemistry
  • Communications
  • Economics
  • Finance
  • Management
  • Marketing
  • Microbiology
  • Physics
  • Physiology
  • Political Science
  • Psychology
  • Sociology
  • Statistics
  • U.S. History
  • World History
  • Writing

Except where noted, content and user contributions on this site are licensed under CC BY-SA 4.0 with attribution required.