Crustaceomorpha

Crustaceomorpha; Temporal range: Cambrian to Recent PreꞒ Ꞓ O S D C P T J K Pg N
	Nebalia bipes, a leptostracan crustacean
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Clade:	Crustaceomorpha; Chernyshev, 1960
Clades
	Crustacea; Pseudocrustacea †Agnostida?; †Waptiidae; †Oelandocarididae; †Cambropachycopidae; †Phosphatocopida; †Isoxyida?; †Bradoriida?; †Euthycarcinoidea?; ;

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 ←

References

↑ 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)
↑ Mikko Haaramo. "Crustaceomorpha – crustaceans and related arthropods". Mikko's Phylogeny Archive. Retrieved January 22, 2012.
1 2 S. M. Gon III. "Trilobite Systematic Relationships". A Guide to the Orders of Trilobites. Retrieved January 22, 2012.
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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