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 ┬Ám 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...

    Lotic community of algal species
    Lotic Communities & Algae

    Lotic communities have conditions that are rather harsh for typical plants. Thus, the diversity of plant species in loti..

    human respiratory system
    Respiration

    The human respiratory system is an efficient system of inspiring and expiring respiratory gases. This tutorial provides ..

    Pikas are an indicator species for climate change
    Indicator Species and Endangered Species

    Certain species are capable of expressing characteristics indicative of the state of the ecosystem they occupy. They are..

    Cell Respiration
    Cell Respiration

    Cell respiration is the process of creating ATP. It is "respiration" because it utilizes oxygen. Know the different stag..

    Geological Periods
    Geological Periods

    Geological periods is a study guide that cites the different geological periods on Earth's timeline. Each has a brief ov..

    Sugar Homeostasis
    Sugar Homeostasis

    The blood sugar level is regulated by two hormones. The mechanism behind this type of negative feedback control is descr..