III. Coelomate Worms: Annelids or Segmented Worms

 

The Annelida are a medium sized phylum of more than 9,000 species of worms. Worldwide in distribution—in sea, freshwater, terrestrial soil. 

 

Characteristics:

 

 

·         Metamerism: 

 

 

Outer covering:

 

 

·         Setae:

 

 

Digestion:

 

 

·         Crop

 

·         Gizzard

 

Excretion:

 

·         Nephridia

 

 

Skeleton/Movement:

 

 

Respiration:

 

 

Circulation:

 

·         Closed system:

 

·         Dorsal Blood Vessel:

 

·         Ventral Blood Vessel:

 

Nervous system:

 

 

Reproductive System:

 

·         Asexual:

 

 

·         Sexual:

 

o   Trochophore:

 

 

Polychaete worms:

·         Parapodia

 

·         Clam worms: Nereis

 

·         Tubeworms:

 

o   Fanworms:

 

 

o   Hydrothermal Dwellers:

 

 

 

Oligochaete Worms:

 

·         Earthworms: “Intestines of the soil”

 

 

 

·         Freshwater Oligochaetes:

 

 

Class Hirudinea: Leeches:

 

 

·         Medicinal Uses:

 

III. Coelomate Worms: Velvet Worms (Onychophorans)

·         Body characteristics: worms with legs?

 

 

 

·         Reproduction:

 

 

o   Viviparous

 

 

·         Unusual feeding method: