Stephonyx Lowry & Stoddart, 1989

Lowry, J. K. & Kilgallen, N. M., 2014, A generic review of the lysianassoid family Uristidae and descriptions of new taxa from Australian waters (Crustacea, Amphipoda, Uristidae), Zootaxa 3867 (1), pp. 1-92 : 61

publication ID

https://doi.org/ 10.11646/zootaxa.3867.1.1

publication LSID

lsid:zoobank.org:pub:B7C6EC5F-5AA3-43B1-BD3D-D8111E0EC3A7

DOI

https://doi.org/10.5281/zenodo.6315623

persistent identifier

https://treatment.plazi.org/id/03AE8B60-AC3A-FFE4-6CC1-FB86FE17C411

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Felipe (2021-06-11 20:53:46, last updated 2024-11-29 10:29:20)

scientific name

Stephonyx Lowry & Stoddart, 1989
status

 

Stephonyx Lowry & Stoddart, 1989 View in CoL View at ENA

( Fig. 39 View FIGURE 39 )

Stephonyx Lowry & Stoddart, 1989: 521 View in CoL .— Lowry & Stoddart, 2003: 284 (catalogue).— Diffenthal & Horton, 2007: 32 View Cited Treatment .— Senna & Serejo, 2007: 8, 13 (key).—Narahara, Tomikawa & Torigoe: 2012 (key).

Type species. Euonyx biscayensis Chevreux, 1908 View in CoL , by original designation.

Included species. Stephonyx View in CoL includes 13 species: S. arabiensis Diffenthal & Horton, 2007 View in CoL ; S. biscayensis ( Chevreux, 1908) View in CoL ; S. carinatus Bellan-Santini, 1997 View in CoL ; S. incertus Bellan-Santini, 1997 View in CoL ; S. mytilus ( Barnard & Ingram, 1990) View in CoL ; S. laqueus (J.L. Barnard, 1967) View in CoL ; S. normani ( Stebbing, 1888) View in CoL ; S. perexcavatus Narahara, Tomikawa & Torigoe, 2012 View in CoL ; S. pirloti ( Sheard, 1938) View in CoL ; S. rafaeli View in CoL sp. nov.; S. scutatus ( Griffiths, 1977) View in CoL ; S. talismani ( Chevreux, 1919) View in CoL ; S. uncinatus Senna & Serejo, 2007 View in CoL .

Diagnostic description. Antenna 1 peduncle article 1 without anterodistal lobe; accessory flagellum not forming cap covering callynophore. Antenna 2 with weakly developed brush setae. Mandible molar a setose tongue with vestigial triturating area, a reduced column with a triturating surface or occasionally a raised weakly setose plate. Maxilla 1 outer plate a well developed 7/4 crown. Maxilla 2 inner plate slightly shorter than outer plate. Gnathopod 1 chelate; coxa 1 reduced, significantly shorter than coxa 2, subquadrate or tapering distally; ischium long (length 2 × to 4 × breadth) to very long (length 4 × to 6 × breadth); carpus very long (length more than 4 × breadth); propodus margins subparallel. Uropod 2 inner ramus not constricted. Telson deeply cleft .

Remarks. Only three uristid genera, Euonyx , Kyska and Stephonyx have chelate first gnathopods. Kyska differs from Euonyx and Stephonyx in having a fully developed gnathopod 1 coxa (significantly reduced in Euonyx and Stephonyx ). Stephonyx is a genus of scavengers with fully developed 7/4 crown of setal-teeth on the outer plate of maxilla 1 whereas Euonyx is a genus of ectoparasitic amphipod with strongly reduced (small) setal-teeth on the outer plate of maxilla 1.

Barnard, J. L. (1967) Bathyal and abyssal gammaridean Amphipoda of Cedros Trench, Baja California. Bulletin of the United States National Museum, 260, 1 - 205. http: // dx. doi. org / 10.5479 / si. 03629236.260.1

Barnard, J. L. & Ingram, C. (1990) Lysianassoid Amphipoda (Crustacea) from deep-sea thermal vents. Smithsonian Contributions to Zoology, 499, 1 - 80. http: // dx. doi. org / 10.5479 / si. 00810282.499

Bellan-Santini, D. (1997) Amphipods of the cold seep community on the South Barbados Accretionary Prism. Crustaceana, 70, 1 - 30. http: // dx. doi. org / 10.1163 / 156854097 x 00311

Chevreux, E. (1908) Diagnoses d'amphipodes nouveaux provenant des campagnes de la Princesse-Alice dans l'Atlantique nord. Bulletin de l'Institut Oceanographique, Monaco, 117, 1 - 13.

Chevreux, E. (1919) Note preliminaire sur les amphipodes recueillis par les expeditions du Travailleur et du Talisman (1880 - 1883). Bulletin du Museum National d'Histoire Naturelle, Paris, 25, 574 - 580.

Diffenthal, M. & Horton, T. (2007) Stephonyx arabiensis (Crustacea: Amphipoda: Lysianassoidea: Uristidae), a new deepwater scavenger species from the Indian Ocean, with a key to the genus Stephonyx. Zootaxa, 1665, 31 - 41.

Griffiths, C. L. (1977) Deep-sea amphipods from west of Cape Point, South Africa. Annals of the South African Museum, 73, 93 - 104.

Lowry, J. K. & Stoddart, H. E. (1989) Stephonyx, a new, widespread genus of lysianassoid Amphipoda. Zoologica Scripta, 18, 519 - 525. http: // dx. doi. org / 10.1111 / j. 1463 - 6409.1989. tb 00145. x

Lowry, J. K. & Stoddart, H. E. (2003) Crustacea: Malacostraca: Peracarida: Amphipoda, Cumacea, Mysidacea. Vol. 19.2 B. CSIRO Publishing, Melbourne, 531 pp.

Narahara, Y., Tomikawa, K. & Torigoe, K. (2012) Four species of the genus Stephonyx (Crustacea: Amphipoda: Uristidae) from Japan, with description of a new species. Journal of Natural History, 46, 1477 - 1507. http: // dx. doi. org / 10.1080 / 00222933.2012.675598

Senna, A. R. & Serejo, C. (2007) A new deep-sea species of Stephonyx (Lysianassoidea: Uristidae) from off the central coast of Brazil. Nauplius, 15 (1), 7 - 14.

Sheard, K. (1938) The amphipod genera Euonyx, Syndexamine and Paradexamine. Records of the South Australian Museum, 6, 169 - 186.

Stebbing, T. R. R. (1888) Report on the Amphipoda collected by H. M. S. Challenger during the years 1873 - 1876. Report on the Scientific Results of the Voyage of H. M. S. Challenger during the years 1873 - 76. Zoology, 29, 1 - 1737, pls. 1731 - 1210.

Gallery Image

FIGURE 39. Stephonyx biscayensis (Chevreux, 1908), female, 22 mm, AM P.35583, from southwest of Ireland, North Atlantic Ocean. Scale bars: MX1, MX2, MP, 0.2 mm; remainder, 0.5 mm.

Kingdom

Animalia

Phylum

Arthropoda

Class

Malacostraca

Order

Amphipoda

Family

Uristidae