Dichotomous Key/Animalia

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Dichotomous Key: Animalia
Kingdom: Animalia

[edit] 2

• Symmetry
  • Radial or pentamerism - #4: Radiata or Echinodermata
  • Bilateral - #5: Bilateria

[edit] 3: Parazoa or Agnotozoa

• Presence of simple tissues
  • Yes - Agnotozoa
  • No - Porifera

[edit] 4: Radiata or Echinodermata

• Bilateral larvae, water vascular system
  • Present - Echinodermata
  • Not present - #21: Radiata

[edit] 5: Bilateria

• First body opening to develop
  • Mouth - #6: Protostomes
  • Anus - #19: Deuterostomes

[edit] 6: Protostomes

• Trochophore larvae
  • Yes - #8: Trochozoa
  • No - #7

[edit] 7

• Presence of a lophophore
  • Yes - #17: Lophophorate
  • No - #12

[edit] 8: Trochozoa

• Segmentation
  • Present - Annelida
  • Not present - #9

[edit] 9

• Presence of a mantle
  • Yes - Mollusca
  • No - #10

[edit] 10

• Symbiotic
  • Yes - Nemertina
  • No - Sipuncula

[edit] 11

• Adults secrete chitinous tubes in which to live
  • Yes - Phoronidae
  • No - Bryozoa

[edit] 12

• Ecdysis
  • Yes - #13: Ecdysozoa
  • No - #18

[edit] 13: Ecdysozoa

• Segmentation
  • Yes - #14: Panarthropoda
  • No - #16

[edit] 14: Panarthropoda

• Jointed legs
  • Yes - Arthropoda
  • No - #15

[edit] 15

• Four body segments and a head
  • Yes - Tardigrade
  • No, one segmented and a three-segmented head - Onychophora

[edit] 16

• Presence of skeleton-like scales at each end, used for movement
  • Yes - Loricifera
  • No - #22

[edit] 17: Lophophorate

• Presence of two shells
  • Yes - Brachiopoda
  • No - #11

[edit] 18

• Presence of coelum
  • Pseudocoelomate - #25: Gnathifera
  • Acoelomate - #24

[edit] 19: Deuterostomes

• Notochord present at some point in the life cycle
  • Yes - Chordata
  • No - #20

[edit] 20

• Radial symmetry present at some point in the life cycle
  • Yes - Echinodermata
  • No - Chaetognatha

[edit] 21: Radiata

• Presence of cnidocytes
  • Yes - Cnidaria
  • No - Ctenophora

[edit] 22

• Presence of spines around head
  • Yes - Kinorhyncha
  • No - #23

[edit] 23

• Presence of spines on proboscis
  • Yes - Priapulida
  • No - could be Nematoda or Nematomorpha

[edit] 24

• Presence of two adhesive tubes
  • Yes - Gastrotricha
  • No - Platyhelminthes

[edit] 25: Gnathifera

• Presence of an evertable proboscis
  • Yes - Acanthocephala
  • No - #26

[edit] 26

Could be Rotifera, Gnathostoma or Limnognathia

Glossary for this page (all links are to Wikipedia articles)
Digestive chamber: Radial symmetry: Bilateral symmetry: Trochophore: Lophophore: Segmentation: Mantle: Symbiosis: Ecydsis: Joint: Notochord: