# Neomysis integer

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Species of crustacean

Neomysis integer Scientific classification Kingdom: Animalia Phylum: Arthropoda Clade: Pancrustacea Class: Malacostraca Order: Mysida Family: Mysidae Genus: Neomysis Species: N. integer Binomial name Neomysis integer (Leach, 1814) [1] Synonyms[1] Mysis integer (Leach, 1814) Mysis scoticus J.V. Thompson, 1828 Mysis vulgaris J.V. Thompson, 1828 Neomysis vulgaris (J.V. Thompson, 1828) Praunus integer Leach, 1814

***Neomysis integer*** is a species of [opossum shrimp](/source/Mysidacea) found in shallow marine bays and [estuaries](/source/Estuary) of [Europe](/source/Europe), with a transparent greenish or brownish body and a large [cephalothorax](/source/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](/source/Brood_pouch_(Peracarida)) 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](/source/Antenna_(biology)), both of which are [biramous](/source/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](/source/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](/source/Telson) (the last abdominal segment between the tail fan) is not forked, a fact emphasised by the [specific name](/source/Specific_name_(zoology)) *"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](/source/Frisia) that were originally linked to the sea but became isolated when the [Afsluitdijk](/source/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](/source/Bosmina) and [copepods](/source/Copepod) are also consumed. Opossum shrimps themselves often fall prey to [fish](/source/Fish). In the Frisian Lakes these include the [European perch](/source/European_perch) (*Perca fluviatilis*), the [European smelt](/source/European_smelt) (*Osmerus eperlanus*), the [ruffe](/source/Ruffe) (*Gymnocephalus cernua*), young [pike-perch](/source/Zander) (*Sander lucioperca*) and sometimes the [European eel](/source/European_eel) (*Anguilla anguilla*).[4] The females have a brood pouch under their thorax in which eggs and young develop.[5]

## References

1. ^ [***a***](#cite_ref-WoRMS_1-0) [***b***](#cite_ref-WoRMS_1-1) Jan Mees (2011). Deprez T (ed.). ["*Neomysis integer* (Leach, 1814)"](https://www.marinespecies.org/aphia.php?p=taxdetails&id=120136). *NeMys*. [World Register of Marine Species](/source/World_Register_of_Marine_Species). Retrieved February 9, 2012.

1. ^ [***a***](#cite_ref-MarLIN_2-0) [***b***](#cite_ref-MarLIN_2-1) [***c***](#cite_ref-MarLIN_2-2) ["An opossum shrimp - *Neomysis integer*"](http://www.marlin.ac.uk/speciesinformation.php?speciesID=3884). [Marine Life Information Network](/source/Marine_Life_Information_Network). Retrieved March 3, 2014.

1. ^ [***a***](#cite_ref-MSIP_3-0) [***b***](#cite_ref-MSIP_3-1) ["*Neomysis integer*"](https://species-identification.org/species.php?species_group=crustacea&id=63). *Macrobenthos of the North Sea: Crustacea*. Marine Species Identification Portal. Retrieved March 4, 2014.

1. ^ [***a***](#cite_ref-Bremer_4-0) [***b***](#cite_ref-Bremer_4-1) 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](/source/Doi_(identifier)):[10.1007/978-94-009-8012-9_5](https://doi.org/10.1007%2F978-94-009-8012-9_5). [ISBN](/source/ISBN_(identifier)) [978-94-009-8014-3](https://en.wikipedia.org/wiki/Special:BookSources/978-94-009-8014-3).

1. **[^](#cite_ref-Scheffel_5-0)** Christoph Needon; Johannes Petermann; Peter Scheffel; Bernd Scheiba (1989). *Naturführer Pflanzen und Tiere* (in German). [Leipzig](/source/Leipzig): [Urania-Verlag](https://en.wikipedia.org/w/index.php?title=Urania-Verlag&action=edit&redlink=1). p. 279. [ISBN](/source/ISBN_(identifier)) [3-332-00256-2](https://en.wikipedia.org/wiki/Special:BookSources/3-332-00256-2).

Taxon identifiers Neomysis integer Wikidata: Q3858315 BOLD: 27170 CoL: 46NDX EoL: 344079 EUNIS: 40136 Fauna Europaea: 192803 Fauna Europaea (new): 1a7d5bce-82e8-4f0f-acaf-a29016c04e5e GBIF: 2220407 iNaturalist: 483941 IRMNG: 10233080 ITIS: 90063 NBN: NBNSYS0000033006 NCBI: 223650 Observation.org: 26955 OBIS: 120136 Open Tree of Life: 523830 SeaLifeBase: 21578 WoRMS: 120136 Praunus integer Wikidata: Q109655350 EUNIS: 40179 GBIF: 4313764

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