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Phylum Rotifera

Phylum Rotifera. What is a Rotifer?. Multicelluar heterotrophic organism They have less than 1000 cells Name means “wheel-bearer”. Characteristics of Rotifers. Bilateral symmetry Crown of hair-like cilia Called the corona 3 main body segments Head Trunk Foot.

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Phylum Rotifera

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  1. Phylum Rotifera

  2. What is a Rotifer? • Multicelluar heterotrophic organism • They have less than 1000 cells • Name means “wheel-bearer”

  3. Characteristics of Rotifers • Bilateral symmetry • Crown of hair-like cilia • Called the corona • 3 main body segments • Head • Trunk • Foot

  4. Characteristics of Rotifers • Body is covered in a well developed cuticle

  5. Rotifer feeding strategy • Sweep food into mouth with current • Current is created by cilia • Mouth opens into a chewing pharynx (mastax) • Contains jaw-like structures (trophi) • Only fossilizable part of a rotifer • Species are identified according to the shape of the trophi

  6. Rotifer diet • Bacteria, algae, & protozoans • Particles eaten are 10 micrometers or less

  7. Rotifer Reproduction • Dioecious- reproduce sexually • Females are larger than males

  8. Rotifer Predators • Copepods (plankton) • Fish- herring, salmon • Moss animals • Comb jellies • Jellyfish • Starfish

  9. Rotifer Taxonomy • Class Bdelloidea (350 species) • Order Bdelloida • Class Monogononta (largest class- 1500 species) • Order Collothecida • Order Flosculariida • Order Ploimida • Class Seisonidea • Order Seisonida

  10. Where can you find a Rotifer? • Common in freshwater- planktonic • Only a few are found in saltwater • Can be free swimming, sessile, or move by inchworming

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