Cumacea

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Related to Cumaceans: Hooded shrimp

Cumacea

[kyü′mās·ē·ə]
(invertebrate zoology)
An order of the class Crustacea characterized by a well-developed carapace which is fused dorsally with at least the first three thoracic somites and overhangs the sides.

Cumacea

 

an order of invertebrates of the subclass of higher crustaceans. The body measures 1–18 mm long (only a few species reaching 35 mm). There are two divisions, the cephalothorax and the narrow abdomen. The cephalothoracic carapace covers the three front thoracic somites and is fused with them. There is a single eye. Of the three pairs of maxillipeds, the first bears complexly constructed gills. In the female, the second and third pairs of maxillipeds have plates that form the brood pouch. The five free thoracic somites each have a pair of two-jointed limbs. Abdominal appendages are found only on the male. There are about 600 species, living primarily in the seas. They serve as food for fish. Members of this order have been acclimatized to some reservoirs (for example, Pseudocuma cercaroides is found in the Dnieper Reservoir).

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The most frequently seen prey items were copepods, cumaceans, and zoea larvae.
The non-productive fraction of the microbiota ("microfauna") consists of bacteria, diatoms, flagellates, and ciliates (3-328 ft [1-100 m]); the meiofauna (328-3,281 ft [100-1,000 m]) is rich in foraminifers, nematodes, turbellarians, gastrotrichans, cumaceans, copepods, and the juvenile phases of macro-invertebrates.
Although some prey items, including mysids, gammaridean amphipods, and cumaceans, were consumed regularly, most prey types were infrequently observed in the stomachs of southern kingfish (Fig.
The material collected is the most complete record of the macrobenthos inhabiting a Canadian high arctic fiord: polychaetes, molluscs (gastropods, bivalves, scaphopods), crustaceans (amphipods, cumaceans, isopods, shrimp), pycnogonids, bryozoans, and echinoderms (echinoids, holothurians, ophiuroids) are represented in the collections.
nondecapod crustaceans (including amphipods, isopods, cumaceans, mysids, and mantis shrimp), bivalves (clams and periwinkles), fishes (44 species identified), worms and wormlike organisms (nematodes, polychaetes, annelids, and leeches), and other unidentified (UID) items (inorganic matter, organic matter, eggs, and insects).
The most important prey found in both species were polychaetes, amphipods and isopods, while cirripeds, crabs, cumaceans, brittlestars and mollusks were the less consumed prey; for this reason these prey were grouped together for analysis as "other prey".
The benthic prey comprised a variety of fishes and crustaceans including amphipods, cumaceans, mysids, shrimps, nematodes, nemerteans, and polychaetes (Table 4).