Phylum Annelida (Segmented Worms)

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Presentation transcript:

Phylum Annelida (Segmented Worms) 15,000 species Bilaterally symmetrical coelomates Marine, fresh water, & moist environments Complex digestive system Closed circulatory system – 1ST! Are hermaphroditic

Class Oligochaeta Include earthworms Extracts nutrients from soils Extremely beneficial to farming enrich and aerate soils

The Earthworm Giant Earthworm – Amazon Basin

Class Polychaeta Most are marine Have paddle or ridge-like extensions on segments called parapodia Aid in gas exchange and locomotion

Sand worm Genus: Nereis, Multiple species Farmed for bait in Maine, USA, for grouper & marlin

Lugworm

How do Polychaetes reproduce and develop? Nereis virens…eat seaweed & microorganisms

Class Hirudinea (leeches) Fresh water, moist terrestrial environments Feed on small invertebrates, or… Parasitic Medicinal value Treat bruising Surgery recovery Anti-coagulant drugs

The Leech

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