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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