Neobirsteiniamysis inermis

Neobirsteiniamysis inermis
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Subphylum:	Crustacea
Class:	Malacostraca
Order:	Mysida
Family:	Mysidae
Subfamily:	Boreomysinae
Genus:	Neobirsteiniamysis
Species:	Neobirsteiniamysis inermis; (Willemoes-Suhm, 1874)
Synonyms[1]
	Petalophthalmus inermis Willemoes-Suhm, 1874; Boreomysis scyphops G. O. Sars, 1879; Boreomysis suhmi Faxon, 1893; Boreomysis distinguenda Hansen, 1908;

Neobirsteiniamysis inermis is a deepwater mysid crustacean species of the genus Neobirsteiniamysis. One of the largest and the only known mysid, distributed in both polar regions.[2][3]

Description

Body is intensively red. The length of adults ranges between 40 and 85 mm, which makes it the largest species in the order Mysida. Compared to the related Neobirsteiniamysis caeca N.inermis has less transparent cuticle, telson with rather parallele lateral margins (convex in N.caeca) and its cleft being 0,16-0,29 of telson length and having convex sides, shorter eyes, not reaching antennular peduncle segment 3, the eye concavity being lateral, not terminal, narrower and less apically protruding antennal scale, which is 5-7 times as long as wide, but with somewhat longer antennular peduncle (longer than half of antennal scale), slightly wider uropodal exopods, with spiniform setae at 0,22-0,29 of exopod length.[4][1]

Taxonomy

The type locality of the species is off Crozet Islands in the Southern Indian Ocean. The type material is probably lost.[1]

Distribution

Found in all four oceans from polar to tropical deepwater, Neobirsteiniamysis inermis is also the most widespread species of mysids, and a generally rare case of the bipolar-amphitropical marine species.[1]

Habitat and Biology

Bathyal-abyssal, nectobenthic species, found from depths of 700-7200 m. Predominantly phytophagous, although may also feed on other crustaceans.[1][5]

References

Daneliya, M. E. "Mysid subfamily Boreomysinae (Crustacea: Mysida: Mysidae)". Records of the Australian Museum. 75 (2). doi:10.3853/j.2201-4349.75.2023.1845.
Hernández-Payán, J.C.; Hendrickx, M.E. (2020). "Neobirsteiniamysis inermis (Willemoes-Suhm, 1874) (Peracarida, Mysida, Mysidae) in western Mexico". Nauplius. 28 (e2020043). doi:10.1590/2358-2936e2020043.
Jan Mees; Kenneth Meland (2012). "Birsteiniamysis inermis". WoRMS. World Register of Marine Species. Retrieved October 27, 2021.
Birstein, J.A.; Tchindonova, J.G. (1958). "Glubokovodnye mizidy severo-zapadnoi chasti Tikhogo okeana [The deep-sea mysids of the northwestern part of the Pacific Ocean]". Trudy Instituta Okeanologii. 27: 258–355.
De Jong-Moreau, L.; Casanova, B.; Casanova, J.-P. (2001). "Detailed comparative morphology of the perioral structures of Mysidacea and Euphusiacea (Crustacea): an indication for the food preference". Journal of the Marine Biological Association of the United Kingdom. 81 (3): 235–241. doi:10.1017/S0025315401003691.

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[Daneliya2023-1] Daneliya, M. E. "Mysid subfamily Boreomysinae (Crustacea: Mysida: Mysidae)". Records of the Australian Museum. 75 (2). doi:10.3853/j.2201-4349.75.2023.1845.

[Hernández-Payán2020-2] Hernández-Payán, J.C.; Hendrickx, M.E. (2020). "Neobirsteiniamysis inermis (Willemoes-Suhm, 1874) (Peracarida, Mysida, Mysidae) in western Mexico". Nauplius. 28 (e2020043). doi:10.1590/2358-2936e2020043.

[3] Jan Mees; Kenneth Meland (2012). "Birsteiniamysis inermis". WoRMS. World Register of Marine Species. Retrieved October 27, 2021.

[Birstein1958-4] Birstein, J.A.; Tchindonova, J.G. (1958). "Glubokovodnye mizidy severo-zapadnoi chasti Tikhogo okeana [The deep-sea mysids of the northwestern part of the Pacific Ocean]". Trudy Instituta Okeanologii. 27: 258–355.

[DeJong-Moreau2001-5] De Jong-Moreau, L.; Casanova, B.; Casanova, J.-P. (2001). "Detailed comparative morphology of the perioral structures of Mysidacea and Euphusiacea (Crustacea): an indication for the food preference". Journal of the Marine Biological Association of the United Kingdom. 81 (3): 235–241. doi:10.1017/S0025315401003691.