Eucarida
| Eucarida | |
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| Meganyctiphanes norvegica, northern krill | |
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Eucarida
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| Orders | |
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Eucarida is a superorder of the Malacostraca, a class of the crustacean subphylum, comprising the decapods, krill and Amphionides.[2] They are characterised by having the carapace fused to all thoracic segments, and by the possession of stalked eyes.[3]
Orders
Eucarida is a diverse and abundant group, comprising the following three orders:
Euphausiacea
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The members of the Euphausiacea are commonly called krill and are all marine shrimp-like species whose pleopods (abdominal appendages) function as swimmerets. They swarm and mostly feed on plankton. This group is composed of only 90 species, some of which are the most abundant species on the planet; in fact, it is estimated that the biomass of the Antarctic krill Euphausia superba' is 500 million tons.[4]
Decapoda
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The Decapoda is a group with 15,000 species[5] which have 5 pairs of thoracopods and a well-developed carapace that covers the gills (which are exposed in krill). They include lobsters, crabs, shrimp and prawns. The decapods are further subdivided on the basis of the gill structure into two suborders Dendrobranchiata (prawns) and Pleocyemata, which is further subdivided into several infraorders, such as the Caridea (true shrimp), the Stenopodidea (boxer shrimp) and the Anomura and the Brachyura (crabs) and so forth.[6][7]
Amphionidacea
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In addition, there is an enigmatic eucarid species, Amphionides reynaudii, which is the sole representative of its order, but due to the loss of several features resulting from its small size, its classification has been unclear.[8]
Phylogeny
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The phylogeny of the Malacostraca is debated.[6] In particular, the monophyly of Eucarida is also under question:
- Monophyletic: many argue that the Eucarida group is a clade, sister to the Peracarida clade[6][9] or to the basal Malacostraca.[7][10] or to Mysida (paraphyletic Schizopoda)[11]
- Paraphyletic: some have proposed a paraphyletic Eucarida forming a clade with a nested Peracarida.[12]
- Polyphyletic: some have grouped Euphausiacea with Mysida to form the Schizopoda,[13][14] or the Euphausiacea with the Hoplocarida,[15] with Decapoda basal to the Peracarida.[14][15]
References
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Wikispecies has information related to: Eucarida |
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