F. { XI. Gill-breathers {26. Crab-fish 26. Crustacea =Articulated= { _Carides_ { =Animals= { { XII. Tube-breathers {27. Spiders 27. Arachnida +Arthropoda+ { _Tracheata_ {28. Centipedes 28. Myriopoda { {29. Flies 29. Insecta { XIII. Skull-less {30. Lancelets 30. Leptocardia { _Acrania_ { G. { =Vertebrate= { XIV. Single-nostriled {31. Lampreys 31. Cyclostoma =Animals= { _Monorrhina_ { { +Vertebrata+ { XV. Amnion-less {32. Fishes 32. Pisces { _Anamnia_ {33. Mud-fish 33. Dipneusta { {34. Sea dragons 34. Halisauria { {35. Amphibians 35. Amphibia { { XVI. Amnion-bearing {36. Reptiles 36. Reptilia { _Amniota_ {37. Birds 37. Aves { {38. Mammals 38. Mammalia ---------------------------------------------------------------- +Vertebrata+ (_Vertebrated animals_) Craniota | +Arthropoda+ | +Mollusca+ (_Articulated Animals_) | (_Molluscs_) +Echinoderma+ Tracheata | Eucephala (_Star-fishes_) | | | | | | Lipobrachia Crustacea Acrania | | Annelida | | Tunicata Acephala | | | | | Bryozoa | Colobrachia | | | | | | | Gephyrea| | Rotatoria \--v---/ \--v---/ | | | | | | | | | | | | | | \---------v-------------------/ \------v-----/ | | | +Vermes+ | | (_Worms_) | \------------------v-------------------/ | | CŒLOMATI (_Worms with a body-cavity_) | Platyhelminthes | |