Lab Midterm Review--Pseudocoelomates

Lab Midterm Review--Pseudocoelomates - both the male and...

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The PSEUDOCOELOMATE Condition Any organism which has a “false” body cavity (pseudocoel) is said to be a pseudocoelomate. .. Lumen of gut PSEUDOCOELOM Mesoderm Endoderm Ectoderm
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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
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PHYLUM NEMATODA (Roundworms) Eutely Only longitudinal muscles Pseudocoelom functions as circulatory system Complete digestive system Renette cells - excretion Amoeboid sperm
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cs through esophagus. Note triradiate esophagus, pseudocoel Phylum Nematoda P
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Male or female? Which one is which? How do you tell?
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A c.s. through female (A) & male (B) nematode worms. Notice the 2 large round structures in the female (uteri) and the thick cuticles on
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Unformatted text preview: both the male and female worms. [fig 5.3] Phylum Nematoda B c.s. of male, note reproductive structures, and pseudocoel (P) [fig 5.3] Phylum Nematoda Lumen of gut P 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 P I O OD U PHYLUM ROTIFERA 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 The other pseudocoelomate phylum we studied!!! Note corona (for feeding, locomotion & respiration), mastax/trophi, pedal glands & spurs (toes) [fig 5.5] PHYLUM Rotifera What was the other one???...
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Lab Midterm Review--Pseudocoelomates - both the male and...

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