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WORMS (Nematodes (Some are free-living, Aquatics or terrestrial, Others…
WORMS
Nematodes
Some are free-living
Aquatics or terrestrial
Others are parasites
Cylindrical body
Don´t have respiratory system
Reproduce sexually
Separate sexes
Don´t divided into segments or rings
There are male individuals and female individuals
Plathyhelmintes
Know as flatworms
Some are aquatics free-living
Flat body divided into rings
Some parasites
Don´t have digestive or respiratory system
Reproduce sexually and they are hermaphrodites
Male and female organs
Self-fertilization
Annelids
Know as ringed worms
Cylindrical body
Segments called metameres
There are bristles
They reproduce sexually
They have cross-fertilization
Phylum
Classes
Olichogaetes
Hirudineans
Polychaetes
Common
Soft and enlongated body without skeleton or limbs
Bilateral symmetry