Cladus: Eukaryota Name Eumalacostraca Grobben, 1892 Reference * C. Grobben (1892). Zur Kenntnis des Stammbaumes und des Systems der Crustaceen. Sitzber. K. Akad. Wiss., Vienna, Math. Nat. Cl. 101: 237-274. -------- The Eumalacostraca (Greek: "true soft shell") are a subclass of crustaceans, containing almost all living malacostracans, about 22,000 described species. (The outgroups are the Phyllocarida and possibly the Hoplocarida or mantis shrimps.) Eumalacostracans have 19 segments (5 cephalic, 8 thoracic, 6 abdominal). 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. Martin and Davis [1] present a classification of living eumalacostracans into orders, to which extinct orders have been added, indicated by †. The group as originally described by Karl Grobben [2] 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.
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