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General Biology 



Subclass 6. 

 Order 18. 



Subclass 7. 

 Order 19. 



Subclass 8. 

 Order 20. 



Subclass 9. 



Order 21. 

 Order 22. 

 Order 23. 



Subclass 10. 



Order 24. 

 Order 25. 

 Order 26. 

 Order 27. 

 Order 28. 



Subclass 11. 



Order 29. 

 Order 30. 



Libelluloidea ( 

 Odonata ( 



Ephemeroidea ( 

 Plectoptera ( 



Perloidea ( 

 Plecoptera ( 



Neuropteroidea ( 



Megaloptera ( 

 Raphidoidea ( 

 Neuroptera ( 



Panorpoidea ( 



Panorpatae ( 

 Trichoptera ( 

 Lepidoptera ( 

 Diptera ( 

 Suctoria ( 



Rhynchota ( 



Homoptera ( 

 Hemiptera ( 



GROUPS OF INVERTEBRATES OF MORE OR LESS UNCER- 

 TAIN SYSTEMATIC POSITION 



Group 1. 



Group 2. 



Group 3. 



Group 4. 



Group 5. 



Group 6. 



Group 7. 



Group 8. 



Group 9. 



Group 10. 



Mesozoa ( 

 Nemertinea ( 

 Nematomorpha ( 

 Acanthocephala ( 

 Chaetognatha ( 

 Rotifera ( 

 Bryozoa ( 

 Phoronidea ( 

 Brachiopoda ( 

 Gephyrea ( 



PHYLUM XL CHORDATA 



Subphylum I. Cephalochorda or 

 Adelochorda ( 



