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

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

• Pancrustacea
• Mandibulata