Phylum Annelida Segmented worms annelus = little ring
Phylum Annelida
Feb 24, 2016
Phylum Annelida. Segmented worms a nnelus = little ring. Body Plan Cephalization One way digestive system Circulatory system Complex organs Segmentation (separated by septa). Annelids include 3 classes:. Leeches. Polychaetes (poly – ih – keets ) Poly = Many Chaeta = bristles. - PowerPoint PPT Presentation
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Phylum AnnelidaSegmented wormsannelus = little ring
Body PlanCephalizationOne way digestive
systemCirculatory
systemComplex organsSegmentation
(separated by septa)
Annelids include 3 classes:
Polychaetes(poly – ih – keets)Poly = ManyChaeta = bristles
Oligochaetes(awly – go – keets)Oligo = Few
Leeches
Polychaetes• Marine worms – live in seas and oceans
• Paired, paddle-like appendages• Poly – chaeta = many bristles
Oligochaetes• Include
earthworms and related species
• Live mainly in soil or fresh water
• Fewer bristles than polychaetes (bristles help anchor them in burrows)
Leeches - Hirudinae• Includes leaches• Mostly freshwater,
external parasites
• Some are carnivorous• Powerful suckers on
both ends of the body used for anchoring
Structural Complexity
• True coelem
• Complex organ systems
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