Outline for Zoology: Invertebrates (3)

Annelida

earthworms, sandworms, leeches; protostomes coelomates with segementation & complete digestive tracts

Picture of earthworms

Picture of roundworms

How many hearts do earthworms have?

five paired hearts/ten hearts; closed circulatory system

Picture of sandworms

Parapodia

in sandworms; used for respiration & movement; marine location

Setae

bristles used for anchorage and movement; in earthworms & sandworms; tips of parapodia

Crop

earthworms; store & moisten food to finish digestion

Gizzard

earthworms; second hollow part; abrasive foods; grinding action; uses soil particles

Clitellum

earthworms; thickened band on anterior end; cocoon formation

Detritivores

feed on partially decayed organic matter; earthworm classification

Picture of leeches

blood sucking parasites or predators; suction-cup mouths

What is lacking in leeches?

bristles & setae

Hirudin

naturally occurring peptide in the salivary glands of blood-sucking leeches that has a blood anticoagulant property; preventing clotting

Metanephridia

earthworms; used for excretion; nitrogen-containing waste

Intestine

earthworms; very end on model; absorb nutrients & finishes digestion