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Worms (Classification (Annelids (3 classes (Oligochaetes, Hirudineans,…
Worms
Classification
Annelids
bristles between metameres
Reproduce sexually
Cylindrical body divided into segments (metameres)
Separate sexes species
Hermaphrodite species
Cross-fertilisation
3 classes
Oligochaetes
Hirudineans
Polychaetes
Platyhelminthes
others are parasites
flat body divided in rings
aquatic free-living
not have digestive or respiratory systems
hermaphrodites
reproduce sexually
Nematodes
Cylindrical body not divided into segments or rings
Reproduce sexually and separate sexes
Not have respiratory system
Free-living aquatics or terrestrials
Others are parasites
Characteristics in common
soft and elongated body
Without skeleton or limbs
Birateral symmetry