Common Earth Worm. Kingdom Animalia. Phylum Annelida. A Presentation By: Heather & Esther. Common Name: Segmented Worms. Leech (medicinal). Video 1: Locomotion of an Annelid http://www.youtube.com/watch?v=dHkDdLQ32ys. Locomotion: Setae (hairs) and Parapodia (limbs).
Video 1: Locomotion of an Annelid
Locomotion: Setae (hairs) and Parapodia (limbs)
Digestion: Extracellular (mouth and anus)
Video 2: Simplified Digestion of an Annelid
Body Segmentation: Segmented into Metameres
(metameres: repeated sections with individual structures)
Body Plan: A Coelomate Animal
(coelomate: gap between endoderm and outer tubes) *1st Animals to develop a complete coelom*
Body Symmetry: Bilateral (2 sides are symmetrical)
Support: Muscle groups and simple Appendages
Nutrition: Marine Worms-
filter feeders or scavengers
digest organic materials from the soil
predators, feed on the blood of other animals
Vascular: Closed System of Blood Vessels (contains several muscular vessels- “hearts”)
Capillary beds pick up or release nutrients and oxygen
Respiratory gas diffuses across the body wall
Gas exchange occurs between capillary beds of body surface and environment
Oxygen is carried by respiratory pigment(hemoglobin) in the blood plasma
Cerebral ganglia and Ventral nerve cord with paired segmental ganglia in etch segment
This helps coordinate swimming/crawling
Eyes in some polychaetes, not in Earthworms or leeches
Receptor 2 light, chemical, & mechanical stimulant on body surface
- One per segment (metamere).
- Nephrostoma (openings) collect residuals from mesoderm
- filters residue and causes reabsorbtion.
- Material excreted by nephridiopore (one body surface)
How do oligochaeta reproduce?
What type of body symmetry do Annelida have?