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Earthworm Dissection Lumbricus terrestris Kingdom: Animalia Phylum: Annelida

Earthworm Dissection Lumbricus terrestris Kingdom: Animalia Phylum: Annelida. Segments Septum Setae Pharynx Esophagus Crop Gizzard Intestine Aortic Arches Ventral Nerve Cord. Dorsal Blood Vessel Clittelum Seminal Vesicles Seminal Receptacles. Students should Identify the following.

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Earthworm Dissection Lumbricus terrestris Kingdom: Animalia Phylum: Annelida

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  1. Earthworm DissectionLumbricus terrestrisKingdom: AnimaliaPhylum: Annelida

  2. Segments Septum Setae Pharynx Esophagus Crop Gizzard Intestine Aortic Arches Ventral Nerve Cord Dorsal Blood Vessel Clittelum Seminal Vesicles Seminal Receptacles Students should Identify the following

  3. Students should know the following terminology • Invertebrate • Castings • Hermaphroditic • Hydrostatic Skeleton • Closed Circulatory System

  4. Students will use the following tools for the earthworm dissection • Scalpel • Probes • Dissecting Pins • Rubber Padded Dissecting Tray

  5. Scalpel

  6. Probe

  7. Dissecting Pins

  8. Dissecting Pan

  9. Before you start dissecting, find the following: • Mouth • Setae – the bristles used for locomotion. They are located by rubbing your fingers along the earthworm’s body. They are often times easier to feel than to see. • Sperm Duct • Clittelum

  10. Mouth

  11. Sperm Duct

  12. Clittelum

  13. Mouth Pin your worm at the tip of the mouth and at its midpoint.

  14. Continue your cut to the mouth Start your incision 2 cm behind the clittelum. Make sure not to cut too deeply.

  15. Begin to separate the skin using pins

  16. Pin the skin back as you go along the cut. Angle your pins outward so that are out of the way.

  17. As you pin the skin back, take your probe and break the partitions between the segments. These are called Septum.

  18. Pharynx

  19. Aortic Arches – Earthworms have 5 pair of these simple hearts.

  20. Aortic Arch

  21. Seminal Vesicles

  22. Seminal Receptacles

  23. Crop

  24. Gizzard

  25. Intestine Dorsal Blood Vessel

  26. Ventral Nerve Cord

  27. Ventral Nerve Cord

  28. Brain

  29. Nerve Cord and Brain

  30. Brain

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