Earthworm Dissection. Lumbricus terrestris Kingdom: Animalia Phylum: Annelida.
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Transcript of Earthworm Dissection. Lumbricus terrestris Kingdom: Animalia Phylum: Annelida.
![Page 1: Earthworm Dissection. Lumbricus terrestris Kingdom: Animalia Phylum: Annelida.](https://reader035.fdocuments.us/reader035/viewer/2022062408/56649f135503460f94c2751c/html5/thumbnails/1.jpg)
Earthworm Dissection
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Lumbricus terrestrisKingdom: AnimaliaPhylum: Annelida
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Students should identify the following
• Segments• Septum• Setae• Pharynx• Esophagus• Crop• Gizzard• Intestine• Aortic Arches (Hearts)• Ventral Nerve Cord
• Dorsal Blood Vessel• Clitellum• Seminal Vesicles• Seminal Receptacles• Cerebral Ganglion (brain)• Anus• Mouth
![Page 4: Earthworm Dissection. Lumbricus terrestris Kingdom: Animalia Phylum: Annelida.](https://reader035.fdocuments.us/reader035/viewer/2022062408/56649f135503460f94c2751c/html5/thumbnails/4.jpg)
Students should know the following terminology
• Invertebrate• Castings• Hermaphroditic• Hydrostatic Skeleton• Closed Circulatory System
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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
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Mouth
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Sperm Duct
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Clittelum
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Mouth
Pin your worm at the tip of the mouth and at its anus.
![Page 10: Earthworm Dissection. Lumbricus terrestris Kingdom: Animalia Phylum: Annelida.](https://reader035.fdocuments.us/reader035/viewer/2022062408/56649f135503460f94c2751c/html5/thumbnails/10.jpg)
Start your incision 2 cm behind the clittelum.
Make sure not to cut too deeply!!
Continue your cut to the mouth
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Begin to separate the skin using pins
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Pin the skin back as you go along the cut. Angle your pins outward so that are out of the way.
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As you pin the skin back, take your probe and break the partitions between the segments. These are called Septum.
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Pharynx
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Aortic Arches – Earthworms have 5 pair of these simple hearts.
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Aortic Arch
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Seminal Vesicles
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Seminal Receptacles
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Crop
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Gizzard
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Dorsal Blood Vessel
Intestine
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Ventral Nerve Cord
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Ventral Nerve Cord
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Brain (Cerebral Ganglion)
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Nerve Cord and Brain
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Brain