Neomysis integer
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Scientific classification 
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Neomysis integer is a species of opossum shrimp found in shallow marine bays and estuaries of Europe, with a transparent greenish or brownish body and a large cephalothorax. It is found in very shallow water in both high and low-salinity habitats. It is a filter feeder and the female broods her eggs in a brood pouch beneath her cephalothorax.
Description
Neomysis integer is a slender opossum shrimp growing to a maximum length of about 17 mm (0.7 in). The head has a pair of large, stalked eyes and two pairs of antennae, both of which are biramous (branched into two parts). The exopod (the outermost branch) of the second antenna forms an elongated scale with bristles round its edges and extends forward into a sharp point. The thorax has eight segments each bearing a pair of biramous limbs, the outer branches of which have a feathery appearance. The head and first six segments of the thorax are covered by a protective carapace which extends forward in a triangular plate with a depressed centre between the eyes. The abdomen bears short limbs and the last segment bears larger, flattened biramous limbs which form a tail fan. The telson (the last abdominal segment between the tail fan) is not forked, a fact emphasised by the specific name "integer". This opossum shrimp is semi-transparent, sometimes with a brownish tinge.[2][3]
Distribution and habitat
Neomysis integer is native to the northeastern Atlantic Ocean, its range extending from the Baltic Sea and North Sea to the Mediterranean. It is found just above the seabed in very shallow waters in coastal and estuarine habitats at a wide range of salinities and is able to adapt to changing salinity levels.[3] It is not common in the open sea but is more often observed in high salinity pools on the foreshore and in non-tidal lagoons.[2] It is often the commonest mysid shrimp in the low-salinity upper parts of estuaries.[2] It is also present in lakes in Frisia that were originally linked to the sea but became isolated when the Afsluitdijk causeway was constructed in 1933. Over the succeeding years, the sea water gradually turned to freshwater and Neomysis integer was the only opossum shrimp that survived.[4]
Biology
These opossum shrimps are frequently found in large numbers and filter small food particles out of the water, occasionally consuming larger prey. The diet consists largely of detritus, but water fleas and copepods are also consumed. Opossum shrimps themselves often fall prey to fish. In the Frisian Lakes these include the European perch (Perca fluviatilis), the European smelt (Osmerus eperlanus), the ruffe (Gymnocephalus cernua), young pike-perch (Sander lucioperca) and sometimes the European eel (Anguilla anguilla).[4] The females have a brood pouch under their thorax in which eggs and young develop.[5]
References
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- ^ a b Script error: No such module "template wrapper".
- ^ a b c Page Module:Citation/CS1/styles.css has no content."An opossum shrimp - Neomysis integer". Marine Life Information Network. Retrieved March 3, 2014.
- ^ a b Page Module:Citation/CS1/styles.css has no content."Neomysis integer". Macrobenthos of the North Sea: Crustacea. Marine Species Identification Portal. Retrieved March 4, 2014.
- ^ a b Page Module:Citation/CS1/styles.css has no content.Bremer, P.; Vijverberg, J. (1982). "Production, population biology and diet of Neomysis integer (Leach) in a shallow Frisian lake (The Netherlands)". Ecology of Mysidacea. Vol. 10. pp. 41–51. doi:10.1007/978-94-009-8012-9_5. ISBN 978-94-009-8014-3.
- ^ Page Module:Citation/CS1/styles.css has no content.Christoph Needon; Johannes Petermann; Peter Scheffel; Bernd Scheiba (1989). Naturführer Pflanzen und Tiere (in German). Leipzig: Urania-Verlag. p. 279. ISBN 3-332-00256-2.
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