Crustaceomorpha

Crustaceomorpha is a proposed clade of arthropods that includes crustaceans and numerous extinct groups. Synapomorphies for the clade are that the larval antenna is a feeding or locomotory organ, and there are six endopodal podomeres in post-antennal limbs.[1]

Crustaceomorpha
Temporal range: Cambrian to Recent
Nebalia bipes, a leptostracan crustacean
Scientific classification
Kingdom:
Animalia
Phylum:
Arthropoda
(unranked):
Crustaceomorpha

Chernyshev, 1960
Subphyla

Extinct groups included in Crustaceomorpha vary considerably. It includes Agnostida (usually treated under Trilobita), Waptiida, Isoxyida, Phosphatocopida, and Bradoriida, among others. These primitive crustaceomorphs are grouped under Pseudocrustacea.[2][3]

The validity of Crustaceomorpha is controversial. It has more support among paleontologists who consider it a sister group to Arachnomorpha, which includes trilobites and chelicerates (see cladogram below). Both are grouped under Schizoramia, a clade of arthropods with biramous appendages.[3][4] In contrast, neontologists tend to support the Mandibulata clade, which groups members of Crustacea together with Hexapoda and Myriapoda.[4]

      Common ancestor ←      
             

Lobopodia

 
             
             

Uniramia

 
      Schizoramia      
             

Crustaceomorpha

 
             

Arachnomorpha

 
 
 
 

See also

References
  1. Jan Bergström & Xian-Guang Hou (2005). "Early Palaeozoic non-lamellipedian arthropods". In Stefan Koenemann & Ronald A. Jenner (ed.). Crustacea and Arthropod Relationships. Taylor & Francis. pp. 75–93. doi:10.1201/9781420037548.ch4. ISBN 978-0-8493-3498-6.
  2. Mikko Haaramo. "Crustaceomorpha – crustaceans and related arthropods". Mikko's Phylogeny Archive. Retrieved January 22, 2012.
  3. S. M. Gon III. "Trilobite Systematic Relationships". A Guide to the Orders of Trilobites. Retrieved January 22, 2012.
  4. David A. Grimaldi & Michael S. Engel (2005). Evolution of the Insects. Cambridge University Press. p. 107. ISBN 978-0-521-82149-0.


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