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EUCOELOMATES

Dive into the world of annelids in Phylum Annelida, exploring the coelomate condition and the anatomical features of Polychaeta, Oligochaeta, and Hirudinea classes. Discover the importance of parapodia, typhlosole, and more!

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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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