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EUCOELOMATES

Discover the world of Annelida, with a focus on the classes Polychaeta, Oligochaeta, and Hirudinea. Learn about their anatomy, structures like parapodia and typhlosole, and fascinating dissections.

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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 the food in the intestine that has already been digested although some scientists still claim that the typhlosole may also play a part in digestion itself. [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. You gave them a bath You gave them some bubbly And then you put them to sleep…. So that you could rip their guts open! What were they?

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

  11. They are not all blood-suckers….

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

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

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