Eumalacostraca

Superregnum: Eukaryota
Cladus: Unikonta
Cladus: Opisthokonta
Cladus: Holozoa
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Cladus: Protostomia
Cladus: Ecdysozoa
Cladus: Panarthropoda
Phylum: Arthropoda
Subphylum: Crustacea
Superclassis: Multicrustacea
Classis: Malacostraca
Subclassis: Eumalacostraca
Superordines: †Eocarida - Syncarida - Peracarida - Eucarida
Name

Eumalacostraca Grobben, 1892
References

C. Grobben (1892). Zur Kenntnis des Stammbaumes und des Systems der Crustaceen. Sitzber. K. Akad. Wiss., Vienna, Math. Nat. Cl. 101: 237–274.
Martin, J.W. & Davis, G.E., (2001). An Updated Classification of the Recent Crustacea. Science Series 39, Natural History Museum of Los Angeles County.

Vernacular names
中文: 真软甲亚纲

Eumalacostraca is a subclass of crustaceans, containing almost all living malacostracans, or about 40,000 described species.[1] The remaining subclasses are the Phyllocarida and possibly the Hoplocarida.[2] Eumalacostracans have 19 segments (5 cephalic, 8 thoracic and 6 abdominal). This arrangement is known as the "caridoid facies", a term coined by William Thomas Calman in 1909. The thoracic limbs are jointed and used for swimming or walking. The common ancestor is thought to have had a carapace, and most living species possess one, but it has been lost in some subgroups.
Caridoid facies

Calman identified the following features as distinguishing eumalacostracan crustaceans:[3]

"Carapace enveloping the thoracic region; movably stalked eyes; biramous first antenna; scale-like exopod on the second antenna; natatory exopods on the thoracic limbs; elongate, ventrally flexible abdomen; tail fan formed by the lamellar rami of the uropods on either side of the telson."

Classification

Martin and Davis present the following classification of living eumalacostracans into orders, to which extinct orders have been added, indicated by †.[2]

The group as originally described by Karl Grobben[4] included the Stomatopoda (mantis shrimp), and some modern experts continue to use this definition. This article follows Martin and Davis in excluding them; they are placed in their own subclass, Hoplocarida.

Subclass Eumalacostraca Grobben, 1892

Superorder Syncarida Packard, 1885
†Order Palaeocaridacea
Order Bathynellacea Chappuis, 1915
Order Anaspidacea Calman, 1904 (including Stygocaridacea)
Superorder Peracarida Calman, 1904
Order Spelaeogriphacea Gordon, 1957
Order Thermosbaenacea Monod, 1927
Order Lophogastrida Sars, 1870
Order Mysida Haworth, 1825
Order Mictacea Bowman, Garner, Hessler, Iliffe & Sanders, 1985
Order Amphipoda Latreille, 1816
Order Isopoda Latreille, 1817
Order Tanaidacea Dana, 1849
Order Cumacea Krøyer, 1846
Superorder Eucarida Calman, 1904
Order Euphausiacea Dana, 1852
Order Amphionidacea Williamson, 1973
Order Decapoda Latreille, 1802
†Order Angustidontida

References
Wikispecies has information related to Eumalacostraca.

Gary C. B. Poore (2002). "Introduction". Crustacea: Malacostraca. Zoological catalogue of Australia. Vol. 19.2A. CSIRO Publishing. pp. 1–7. ISBN 978-0-643-06901-5.
J. W. Martin & G. E. Davis (2001). An Updated Classification of the Recent Crustacea (PDF). Natural History Museum of Los Angeles County. pp. 132 pp.
Hessler, Robert R. (1983). "A defense of the caridoid facies; wherein the early evolution of the eumalacostraca is discussed". In Schram, Frederick R. (ed.). Crustacean Phylogeny (PDF). Rotterdam: A.A. Balkema. ISBN 90-6191-231-8. Archived from the original (PDF) on 2014-05-14. Retrieved 2014-05-14.
C. Grobben (1892). "Zur Kenntnis des Stammbaumes und des Systems der Crustaceen". Sitzungsberichte der Kaiserlichen Akademie der Wissenschaften, Vienna. Mathematisch-naturwissenschaftliche Classe. 101: 237–274.