Phylum Annelida (Segmented Worms) - Biology Junction

Phylum Annelida (Segmented Worms) - Biology Junction

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 Include earthworms Extracts nutrients from soils Extremely beneficial to farming as they enrich and aerate soils

The Earthworm Giant Earthworm Amazon Basin 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 Lugworm 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 The Leech

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