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EUCOELOMATES

EUCOELOMATES. PHYLUM ANNELIDA onwards…. The EUCOELOMATE Condition. 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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EUCOELOMATES

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  1. EUCOELOMATES PHYLUMANNELIDA onwards….

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

  3. PHYLUMANNELIDA3 CLASSES:CLASSPolychaetaCLASS OligochaetaCLASS Hirudinea

  4. Note parapodium w/ setae & acicula (A). Parapodia are used for locomotion, sensory purposes & respiration. [fig 6.3-A] PHYLUM Annelida CLASS Polychaeta A

  5. PHYLUMAnnelida CLASS Polychaeta. EC Esophagus MP EC Polychaete dissection. Note esophageal caeca (EC) and muscular pharynx (MP). Remember, polychaete worms have parapodia (which look like “fins”) [fig 6.4]

  6. This image is a give-away…….it is usually on an exam…. What is this?

  7. Note typhlosole. This increases the surface area to aid in absorption of and digestion of food. [fig 6.8] PHYLUM Annelida CLASS Oligochaeta Dorsal blood vessel Coelom Typhlosole

  8. Note longitudinal & circular muscles, nephridium (N), and the coelom (C). [fig 6.8] PHYLUM Annelida CLASS Oligochaeta C N

  9. PHYLUM Annelida CLASS Oligochaeta. Earthworm dissection [fig 6.7] Pharynx (P) Esophageal region (P - G) w/ pseudohearts Nephridia Gizzard (G)

  10. They are not all blood-suckers…. What class?

  11. PHYLUM AnnelidaCLASS Hirudinea ? ? B A (A) Preserved organism (B) whole mount Note segmentation (annuli), as well as the 2 suckers. [fig 6.9]

  12. PHYLUM AnnelidaCLASS Hirudinea O T B A (O) Long slender ovary (T) Round testis

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