Phylum Annelida•Annelid- A round worm like animal that has a segmented body

-Aquatic or land -Segments are separated by internal walls called

septa (almost every segment looks identical)

• Feeding- long digestive tract -mouth and anus-have a pharynx

-carnivore/herbivore/filter feeder/detritus**Have a crop (stores food) and a gizzard (grinds the food)

Digestive System

• Respiration- aquatic= gills-land = cutaneous (diffusion through skin/cuticle)

• Internal Transport (closed circulatory system)-two blood vessels

i.)dorsal blood (blood moves towards head from anus PA)ii.)ventral vessel (blood moves towards

anus from head A P)

• Excretion- solid undigested waste= anus (waste is called castings)-ammonia/metabolic waste = nephridia

• Response- brain and ganglia-nerve cord

**Most have: -statocysts-chemical receptors /sensory cells -eyes (light sensitive)

• Movement: two major muscle groups1.) Longitudinal (run anterior/posterior)

-contract=shorter/longer

2.) Circular (around the body)-contract = skinny/”fatter”

**Many have setae/bristles

• Reproduction: -Most are sexual/separate sexes

(external fertilization)-earthworms and leeches are hermaphrodites

(internal fertilization)-contain a clitellum (mucus protection that slides

off and protects the fertilized eggs)

Three Different Classes

• Polychaetes

• Oligochaetes

• Hirudinea

• annelid summary video