Crustaceomorpha

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

Chernyshev, 1960
Clades

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]

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 ←

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 . Crustacean Issues. Vol. 16. Taylor & Francis. pp.  75–93. doi:10.1201/9781420037548.ch4 (inactive 11 July 2025). ISBN   978-0-8493-3498-6.{{cite book}}: CS1 maint: DOI inactive as of July 2025 (link)
  2. ↑ Mikko Haaramo. "Crustaceomorpha – crustaceans and related arthropods". Mikko's Phylogeny Archive. Retrieved January 22, 2012.
  3. 1 2 S. M. Gon III. "Trilobite Systematic Relationships". A Guide to the Orders of Trilobites. Retrieved January 22, 2012.
  4. 1 2 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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