Temporal range: Mississippian–Recent
Krøyer, 1846 
8, See taxonomy
Cumacea is an order of small marine crustaceans of the superorder Peracarida, occasionally called hooded shrimp or comma shrimp. Their unique appearance and uniform body plan makes them easy to distinguish from other crustaceans. They live in soft-bottoms such as mud and sand, mostly in the marine environment. There are more than 1,500 of species of cumaceans formally described. The species diversity of Cumacea increases with depth.
The carapace of a typical cumacean is composed of several fused dorsal head parts and the first three somites of the thorax. This carapace encloses the appendages that serve for respiration and feeding. In most species, there are two eyes at the front side of the head shield, often merged into a single dorsal eye lobe. The five posterior somites of the thorax form the pereon. The pleon (abdomen) consists of six cylindrical somites.
The first antenna (antennule) has two flagella, the outer flagellum usually being longer than the inner one. The second antenna is strongly reduced in females, and consists of numerous segments in males.
Cumaceans are mainly marine crustaceans. However, some species can survive in water with a lower salinity, like brackish water (e.g. estuaries). In the Caspian Sea they even reach some rivers that flow into it. A few species live in the intertidal zone.
Most species live only one year or less, and reproduce twice in their lifetime. Deep-sea species have a slower metabolism and presumably live much longer.
Cumaceans feed mainly on microorganisms and organic material from the sediment. Species that live in the mud filter their food, while species that live in sand browse individual grains of sand. In the genus Campylaspis and a few related genera, the mandibles are transformed into piercing organs, which can be used for predation on foraminiferans and small crustaceans.
Reproduction and development
Cumaceans are a clear example of sexual dimorphism: males and females differ significantly in their appearance. Both sexes have different ornaments (setation, knobs, and ridges) on their carapace. Other differences are the length of the second antenna, the existence of pleopods in males, and the development of a marsupium (brood pouch) in females. There are generally more females than males, and females are also larger than their male counterparts.
Cumaceans are epimorphic, which means that the number of body segments does not change during development. This is a form of incomplete metamorphosis. Females carry the embryos in their marsupium for some time. The larvae leave the marsupium in the manca stage, in which they are almost fully grown and are only missing their last pair of pereiopods.
History of research
The order Cumacea has been known since 1780, when Ivan Ivanovich Lepechin described the species "Oniscus scorpioides" (now Diastylis scorpioides). At the time, many scientists thought that the cumaceans were larval stages of decapods. In 1846, they were recognised as a separate order by Henrik Nikolaj Krøyer. Twenty-five years later, about fifty different species had been described, and currently there are more than 1,500 described species. The German zoologist Carl Wilhelm Erich Zimmer studied the order Cumacea very intensively.
- Bodotriidae Scott, 1901 (379 species in 36 genera)
- Ceratocumatidae Calman, 1905 (10 species in 2 genera)
- Diastylidae Bate, 1856 (318 species in 22 genera)
- Gynodiastylidae Stebbing, 1912 (106 species in 12 genera)
- Lampropidae Sars, 1878 (114 species in 15 genera)
- Leuconidae Sars, 1878 (139 species in 16 genera)
- Nannastacidae Bate, 1866 (426 species in 25 genera)
- Pseudocumatidae Sars, 1878 (30 species in 12 genera)
One species is also placed incertae sedis in the order.
- H. N. Krøyer (1846). "On Cumaceerne Familie". Naturh. Tidsskr. 2 (2): 123–211, plates 1–2.
- N. S. Jones (1976). British Cumaceans. Synopses of the British Fauna No. 7. Academic Press. ISBN 978-0-12-389350-5.
- R. Brusca & G. Brusca (2003). Invertebrates (2nd ed.). Sunderland, Massachusetts: Sinauer Associates. ISBN 978-0-87893-097-5.
- M. Bacescu & I. Petrescu (1999). "Traité de zoologie. Crustacés Peracarides. 10 (3 A). Ordre des Cumacés". Mémoires de l'Institut Océanographique de Monaco 19: 391–428.
- T. Akiyama & M. Yamamoto (2004). "Life history of Nippoleucon hinumensis (Crustacea: Cumacea: Leuconidae) in Seto Inland Sea of Japan. I. Summer diapause and molt cycle" (PDF). Marine Ecology Progress Series 284: 211–225. doi:10.3354/meps284211.
- Frederick R. Schram, Cees H. J. Hof, Royal H. Mapes & Polly Snowdon (2003). "Paleozoic cumaceans (Crustacea, Malacostraca, Peracarida) from North America". Contributions to Zoology 72 (1): 1–16.
- Shane T. Ahyong, James K. Lowry, Miguel Alonso, Roger N. Bamber, Geoffrey A. Boxshall, Peter Castro, Sarah Gerken, Gordan S. Karaman, Joseph W. Goy, Diana S. Jones, Kenneth Meland, D. Christopher Rogers & Jörundur Svavarsson (2011). Subphylum Crustacea Brünnich, 1772 (PDF). In Z.-Q. Zhang. "Animal biodiversity: an outline of higher-level classification and survey of taxonomic richness". Zootaxa 3148: 165–191.
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