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Flat_worm.JPG Ribbon_ worm.jpg Peanut_worms.jpg

Flatworms
(Plathyhelminthes)


Ribbonworms
(Nemetea)
 
Peanutworms
(Sipunculida)
Acorn worms
(Hemichordata)
Bristle_worm.jpg
Bristleworms
(Polychaeta)
 
Characteristics of unsegmented worms(adenophorea)are:

  • amphids always post-labial, variable shape, pore-like to elaborate
  • deirids are not seen
  • phasmids are generally absent
  • hypodermal glands resent (excretory?) uninucleate
  • simple non-tubular excretory system when present
  • three caudal glands commonly opening through a spinneret at the tail tip
  • male generally has two testes
  • caudal alae are rare
  • male with supplement glands in a single ventro-median row
  • sensory papillae in cephalic region and along the body
  • generally there are five esophageal glands
  • marine, freshwater, terrestrial
  • these are also called as Aphasmidia as they donot have the phasmids
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