phylum annelida
DESCRIPTION
Phylum annelida. The Segmented Worms. Internal anatomy. https:// www.youtube.com/watch?v=u9HHS1uPFSo. Internal anatomy. Hirudinea – the leeches. Note the adaptation of the mouth to the parasitic niche of the leeches - PowerPoint PPT PresentationTRANSCRIPT
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The Segmented Worms
PHYLUM ANNELIDA
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INTERNAL ANATOMY
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INTERNAL ANATOMY
https://www.youtube.com/watch?v=u9HHS1uPFSo
![Page 4: Phylum annelida](https://reader036.vdocument.in/reader036/viewer/2022062302/568163c2550346895dd4e4d9/html5/thumbnails/4.jpg)
• Note the adaptation of the mouth to the parasitic niche of the leeches
• Note also the segmentation which makes it similar to the other annelid worms
HIRUDINEA – THE LEECHES
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• This leech has an anterior sucker for feeding and a posterior sucker for attachment
• https://www.youtube.com/watch?v=ye4N2ZeJESA
HIRUDINEA – THE LEECHES
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• Note the parapodia
• Parapodia are expanded groups of structures (including lobes and setae) used for locomotion and gas exchange
• Note also the specialization of segments and well developed cephalization
• https://www.youtube.com/watch?v=kIoN2PCvL4o
• https://www.youtube.com/watch?v=UuApLH8rlwY
CLASS POLYCHAETAE
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• Note the clitellum – a reproductive structure that will form a protective case for the eggs & larvae
• Note the specialization of anterior and posterior segments
• https://www.youtube.com/watch?v=uO4lkv-jLRs
CLASS OLIGOCHAETAE – THE EARTHWORMS
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• Earthworms are monoecious (hermaphroditic), but cannot self-fertilize
• https://www.youtube.com/watch?v=bFpblBf1dfE
EARTHWORM REPRODUCTION