Dictionary > Choanoflagellate

Choanoflagellate

Definition
noun, plural: choanoflagellates
A flagellate protozoan of the genera Monosiga and Proterospongia of the class Choanoflagellatea, characterized by possessing a protoplasmic collar around the base of the flagellum
Supplement
Choanoflagellates are free-living protozoans and exist as unicellular or in colonies. They are flagellate eukaryotes and are, according to evolutionary biologists, as the closest living ancestors of animals.
They are called choanoflagellates because each of them has one flagellum located apically and at the base of the flagellum is the conical transparent food-gathering collar made up of 30-40 actin-filled protrusions (referred to as microvilli). The microvilli gather bacteria and detritus, which are drawn by the flagellum and are later engulfed by the choanoflagellate cell.
Their cell body is ovoid or spherical in shape and about 3-10 µm in diameter. The flagellum helps not only for obtaining nourishment but also for propeling the choanoflagellate cell body in an aqueous medium. The flagellum pushes the body along the water current it generates. Nevertheless, many of them are solitary and sessile and may or may not have a stalk. Examples of choanoflagellate species are Monosiga brevicollis and Salpingoeca rosetta.
Word origin: Greek choane (a funnel) + flagellate (whip)
Synonym(s):

  • craspedophyte
  • Craspedophyceae
  • collared flagellate
  • Choanomonada
  • Choanoflagellea
  • Choanoflagellida
  • Choanomonadea
  • Choanoflagellata

See also:

  • protozoa
  • flagella


  • You will also like...

    Types and Causes of Brain Damage
    Types and Causes of Brain Damage

    This tutorial describes the different types and causes of brain damage. Find out how genetics, physical injury, lack of ..

    kinesin motor proteins transporting molecules across microtubules
    Movement of Molecules Across Cell Membranes

    Molecules move within the cell or from one cell to another through different strategies. Transport may be in the form of..

    Lake Wakatipu, New Zealand
    New Zealand’s Unique Geographical History

    Explore why New Zealand has such unique flora and fauna, and learn why long periods of geographical isolation. This less..

    Carbohydrates, fats and proteins - dietary sources
    A Balanced Diet – Carbohydrates and Fat

    Apart from vitamins, the human body also requires high energy sources such as carbohydrates and fats. If you want an ove..

    The Human Physiology
    The Human Physiology

    Physiology is the study of how living organisms function. Thus, human physiology deals specifically with the physiologic..

    Cell structure
    Cell Structure

    A typical eukaryotic cell is comprised of cytoplasm with different organelles, such as nucleus, endoplasmic reticulum, G..

    Related Articles...

    No related articles found

    See all Related Topics