Rotifer

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Rotifer
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Phylum Rotifera

• From the Latin Rota a wheel and Ferre to bear or
  carry
• Rotifera is divided into two classes, the
  Digononta and the Monogononta
• The members of the class Monogononta constitutes
  90 of the known species

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Characteristics of Rotifers

• 1)Bilaterally symmetrical.
• 2)Body has more than two cell layers, tissues and
  organs.
• 3)Body cavity is a pseudocoelom second body
  cavity .
• 4)Body possesses a through gut with an anus.
• 5)Body covered in an external layer of chitin
  called a lorica.
• 6)Has a nervous system with a brain and paired
  nerves. 7)Has no circulatory or respiratory
  organs.
• 8)Reproduction mostly parthenogenetic an asexual
  form of reproduction found in females where
  growth and development of embryos or seeds occurs
  without fertilization by a male. , otherwise
  sexual and gonochoristic reproduction with two
  distinct sexes.
• 9)Feed on bacteria, and protists, or are
  parasitic.
• 10)All live in aquatic environments either free
  swimming or attached.

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A Lil Video !
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Physical Characteristics

• The body is generally divided into a head, a
  trunk, and a foot region
• The largest organ in the head is the wheel organ.
• The trunk shape varies from long to spherical or
  baglike .
• The foot has one or several sections, and it
  often has two toes with sticky glands at the
  tips.

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Habitat

• Rotifers live in still water and flowing water
  environments such as lake bottoms, rivers, or
  streams.
• Rotifers are also commonly found on mosses and
  lichens growing on rocks and aquatic insect
  larvae.

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Feeding

• The two wheels on rotifers are made of cilia that
  beat and create a current that draws water
  containing food into the gut of the rotifer.
• Rotifers eat bacteria (top left) , protists
  (bottom left) , and other small animals.

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Reproduction

• The reproduction of rotifers can be sexual and by
  parthenogenesis.
• The mictic female produces eggs that undergo the
  usual double meiotic division and are haploid.
• Sexual reproduction occurs in the rotifers of
  Class Monogononta

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Quiz Answers

• 1.The body is generally divided into a head, a
  trunk, and a foot region. The largest organ in
  the head is the wheel organ. The trunk shape
  varies from long to spherical or baglike .
• 2. Most Rotifers live in lake bottoms, rivers, or
  streams.
• 3. Mitic
• 4. Phylum Rotifera
• 5.The corona is the part of a rotifer that is
  used as a feeding device and locomotive device.

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Diagram
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The End

• Tishana
• Shanisa
• Janasia