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Understanding Pseudocoelomates and EUCOELOMATES: Nematoda and Rotifera

Explore the characteristics of pseudocoelomates, focusing on Phylum Nematoda (Roundworms) and Phylum Rotifera. Learn about their unique features, functions of pseudocoelom, and distinguishing traits. Dive into the intricacies of their anatomy and physiological systems.

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Understanding Pseudocoelomates and EUCOELOMATES: Nematoda and Rotifera

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  1. PSEUDOCOELOMATES PHYLUMNEMATODAPHYLUMROTIFERA

  2. Ectoderm Mesoderm PSEUDOCOELOM Endoderm Lumen of gut The PSEUDOCOELOMATECondition Any organism which has a “false” body cavity (pseudocoel) is said to be a pseudocoelomate...

  3. Definition of a pseudocoelom?- a fluid-filled body cavity, (derived from the blastocoel), which surrounds the gut. Functions (i.e. what’s it used for?) • Hydrostatic skeleton • Circulatory • Location of organs – reproduction & excretion

  4. PHYLUMNEMATODA • (Roundworms) • Eutely • Only longitudinal muscles • Pseudocoelom functions as circulatory system • Complete digestive system • Renette cells - excretion • Amoeboid sperm

  5. cs through esophagus. Note triradiate esophagus, pseudocoel (P) & thick cuticle [fig 5.4] P Phylum Nematoda

  6. Male or female? Which one is which? How do you tell?

  7. c.s. through female (A) & male (B) nematode worms. Notice the 2 large round structures in the female (uteri) and the thick cuticles on both the male and female worms. [fig 5.3] B Phylum Nematoda A

  8. c.s. of male, note reproductive structures, and pseudocoel (P) [fig 5.3] Phylum Nematoda P Lumen of gut

  9. c.s. of female Note intestine (I), pseudocoel (P), ovaries (O), oviducts (OD), & one of the 2 LARGE uteri (U) [fig 5.3] Phylum Nematoda I P OD U O

  10. PHYLUMROTIFERA • Cirri, corona & trochus bring in water currents and therefore aid in feeding, respiration and locomotion • Mastax & trophi = internal feeding apparatus • Pedal glands and spurs (toes) – attachment • Flame bulb – excretory canals • Parthenogenesis, Mictic, viviparous

  11. The other pseudocoelomate phylum we studied!!! Note corona (for feeding, locomotion & respiration), mastax/trophi, pedal glands & spurs (toes) [fig 5.5] What was the other one??? PHYLUM Rotifera

  12. EUCOELOMATES PHYLUMANNELIDA onwards….

  13. TheEUCOELOMATECondition Ectoderm Mesoderm COELOM Endoderm Lumen of gut Any triploblastic organism which has a TRUE body cavity is said to be a (eu)coelomate...

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