phylum annelida n.
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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.

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phylum annelida
Phylum Annelida

Segmented worms

annelus = little ring

slide2

Body Plan

  • Cephalization
  • One way digestive system
  • Circulatory system
  • Complex organs
  • Segmentation (separated by septa)
annelids include 3 classes
Annelids include 3 classes:

Leeches

Polychaetes

(poly – ih – keets)

Poly = Many

Chaeta = bristles

Oligochaetes

(awly – go – keets)

Oligo = Few

polychaetes
Polychaetes
  • Marine worms – live in seas and oceans
  • Paired, paddle-like appendages
  • Poly – chaeta = many bristles
oligochaetes
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
Leeches - Hirudinae
  • Includes leaches
  • Mostly freshwater, external parasites
  • Some are carnivorous
  • Powerful suckers on both ends of the body used for anchoring
structural complexity
Structural Complexity
  • True coelem
  • Complex organ systems