phylum annelida segmented worms
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Phylum Annelida (Segmented Worms)

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Phylum Annelida (Segmented Worms). 15,000 Annelid species Bilaterally symmetrical coelomates Coelomes divided into partitions by septa Inhabit marine, fresh water, & moist environments Has complex digestive system Has closed circulatory system Epidermis is primary gas exchange organ

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phylum annelida segmented worms

Phylum Annelida(Segmented Worms)

15,000 Annelid species

Bilaterally symmetrical coelomates

Coelomes divided into partitions by septa

Inhabit marine, fresh water, & moist environments

Has complex digestive system

Has closed circulatory system

Epidermis is primary gas exchange organ

Are hermaphroditic

Reproduce sexually by cross fertilization

Reproduce asexually through regeneration

3 Classes

class oligochaeta
Class Oligochaeta
  • Include earthworms
  • Extracts nutrients from soils
  • Extremely beneficial to farming as they enrich and aerate soils
the earthworm
The Earthworm

Giant Earthworm – Amazon Basin

class polychaeta
Class Polychaeta
  • Very similar to oligochaeta
  • Most are marine
  • Have paddle or ridge-like extensions on segments called parapodia
  • Aid in gas exchange and locomotion
class hirudinea leeches
Class Hirudinea (leeches)
  • Most inhabit fresh water, or moist terrestrial environments
  • Feed on small invertebrates or are parasitic
  • Have significant medicinal value in treating bruising, and as a source of Pharmaceuticals
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