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PSEUDOCOELOMATES

PSEUDOCOELOMATES. PHYLUM NEMATODA PHYLUM ROTIFERA. Ectoderm. Mesoderm. PSEUDOCOELOM. Endoderm. Lumen of gut. The PSEUDOCOELOMATE Condition. Any organism which has a “false” body cavity (pseudocoel) is said to be a pseudocoelomate.

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PSEUDOCOELOMATES

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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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