can u show the diagram of invertibrates' excretory organ?

A variety of excretory structures are found in the invertebrates. 

  • Protonephridia or flame cells are the excretory structures in Platyhelminthes (Flatworms, e.g., Planaria), rotifers, some annelids and the cephalochordate – Amphioxus
  • Nephridia are the tubular excretory structures of earthworms and other annelids. 
  • Malpighian tubules are the excretory structures of most of the insects including cockroaches.

The diagram of the nephridia and malphigian tubules are given in the study material of the chapter 7, "Structural Organisation in Animals". Kindly go through it and get back to us for further doubts. 

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