Annelida Kingdom Animalia Phylum Annelida segmented bodies have

Annelida Kingdom: Animalia Phylum: Annelida • • segmented bodies have setae (bristles) complex organ systems coelom

Feeding: • mouth/anus • pharynx pumps food into esophagus • food then stored in crop • ground up in the gizzard, passed to intestine, out the anus

Circulation: • closed circulatory system – blood contained in a network of vessels 1. Dorsal blood vessel 2. Ventral blood vessel

Respiration: • aquatic annelids have gills • land-dwelling annelids exchange gases via diffusion through moist skin

Excretion: • digestive wastes through anus • cellular wastes through nephridia Response: • brain (ganglia) • nerve cords

Movement: • longitudinal muscles – shorten/fatten • circular muscles – wrap around each segment • longer/thinner Reproduction: • sexually • some separate sexes • some hermaphrodites, but rarely fertilize own eggs • clitellum secretes a mucus ring into which eggs/sperm are released

Class: Oligochaeta (earthworms) • most live in soil or fresh water • aerate/mix soil • tunnels are passageways for plant roots and water • help decompose plant matter • food source

Class: Hirudinea (leeches) • external parasites • suck blood and body fluids • razor-sharp jaws slice skin, then use pharynx to suck blood • often used for medicinal purposes