Rotifera are small freshwater and some marine animals that range in size from 0.1 to 3 mm long. They are usually solitary and free-swimming. Rotifera have a pseudocoelom body plan where the organs lie free in the false body cavity. They have an anterior end with a ciliated corona and posterior end with toes and adhesive glands. They also have a complete digestive system that is regionally specialized.

1. Phylum: RotiferaPhylum: Rotifera
By Mr. ChapmanBy Mr. Chapman

2. Phylum: RotiferaPhylum: Rotifera
 Range in size from .1 to 3 mm long andRange in size from .1 to 3 mm long and
are found in most freshwater, some areare found in most freshwater, some are
marine.marine.
 Usually solitary, free-swimming animalsUsually solitary, free-swimming animals

3. PseudocoelomatePseudocoelomate
 PseudocoelomatesPseudocoelomates
 Pseudo- falsePseudo- false
 Coelum- body cavityCoelum- body cavity
 PseudocoelPseudocoel
 False body cavityFalse body cavity
 Organ lie free in theOrgan lie free in the
cavitycavity

4. CharacteristicsCharacteristics
 Triploblastic, bilateralTriploblastic, bilateral
symmetry,symmetry,
unsegmented,unsegmented,
pseudocoelomatepseudocoelomate
 Anterior end withAnterior end with
ciliated organ calledciliated organ called
coronacorona
 Posterior end withPosterior end with
toes and adhesivetoes and adhesive
glandsglands

5. CharacteristicsCharacteristics
 Complete digestive system, regionallyComplete digestive system, regionally
specializedspecialized
 Males rare or absentMales rare or absent

6. Complete digestiveComplete digestive
SystemSystem
 Mechanical breakdown of foodMechanical breakdown of food
 DigestionDigestion
 AbsorptionAbsorption
 Feces formationFeces formation

7. Complete digestiveComplete digestive
SystemSystem
 Mechanical breakdown of foodMechanical breakdown of food
 DigestionDigestion
 AbsorptionAbsorption
 Feces formationFeces formation