Dictionary > Monotremata

Monotremata

Definition
noun
(taxonomy) A subdivision of the class Mammalia comprised of mammals laying eggs rather than giving birth to live young
Supplement
The class Mammalia pertains to any of the endothermic vertebrates identifiable by the following characteristics: a neocortex, three middle ear bones, a lower jaw made of a single bone, a hairy body covering, a thoracic diaphragm, a four-chambered heart, and females that are mostly viviparous. This taxonomic class can be subdivided into three: (1) Placentalia (placentals), (2) Monotremata (monotremes), and (3) Marsupialia (marsupials).
Monotremata or the monotremes are distinguished from other mammals by laying eggs rather than giving birth to live young. They have a cloaca wherein the ducts of the urinary, genital, and alimentary systems terminate, similar to birds. There are only two kinds of monotremes in the world, echidnas and platypuses. Both of them can be found living in Australia, Tasmania, and New Guinea. They do not have well defined nipples. The mothers lactate their young through the openings on their skin connected to the mammary glands.
Word origin: Greek monos (one) + trema (hole, i.e. referring to the cloaca)
Scientific classification:

  • Kingdom: Animalia
  • Phylum: Chordata
  • Clade: Synapsida
  • Class: Mammalia
  • Subclass: Yinotheria
  • Infraclass: Australosphenida
  • Order: Monotremata C.L. Bonaparte, 1837

Other common name(s):

  • monotremes
  • Compare:

    See also:

  • mammal


  • You will also like...

    squirrel
    Animal Water Regulation

    Animals adapt to their environment in aspects of anatomy, physiology, and behavior. This tutorial will help you understa..

    Plant Water Regulation
    Plant Water Regulation

    Plants need to regulate water in order to stay upright and structurally stable. Find out the different evolutionary adap..

    Water Cycle
    The Water Cycle

    The water cycle (also referred to as the hydrological cycle) is a system of continuous transfer of water from the air, s..

    Adaptation Tutorial
    Adaptation Tutorial

    Adaptation, in biology and ecology, refers to the process or trait through which organisms or the populations in a habit..

    Plant biology
    Plant Biology

    Plantlife can be studied at a variety of levels, from the molecular, genetic and biochemical level through organelles, c..

    Early Earth
    The Origins of Life

    This tutorial digs into the past to investigate the origins of life. The section is split into geological periods in the..

    Related Articles...

    No related articles found

    See all Related Topics