Eurythenes S. I. Smith

• Main Authors: Weston, Johanna N. J., Espinosa-Leal, Liliana, Wainwright, Jennifer A., Stewart, Eva C. D., González, Carolina E., Linley, Thomas D., Reid, William D. K., Hidalgo, Pamela, Oliva, Marcelo E., Ulloa, Osvaldo, Wenzhöfer, Frank, Glud, Ronnie N., Escribano, Rubén, Jamieson, Alan J.
• Format: Text
• Language: unknown
• Published: Zenodo 2021
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Malacostraca; Amphipoda; Eurytheneidae; Eurythenes; Chevreux; Lowry; Oliva; Pacific; Eurythenes gryllus
• Online Access: https://dx.doi.org/10.5281/zenodo.5841866; https://zenodo.org/record/5841866

Key to Eurythenes specimens larger than 25 mm. This key is expanded from d’ Udekem d’ Acoz and Havermans (2015), and the caution of use remains. Character differences can be tough to objectively discern, and certain characteristics can be phenotypically variable between cohorts. Visual identification paired with DNA barcoding is strongly recommended. 1. Dactylus of pereopods 3–7 short (less than 0.3 of propodus)....................................................................................................2 Dactylus of pereopods 3–7 long (more than 0.6 of propodus).......................................... Eurythenes obesus (Chevreux, 1905) 2. The palm of gnathopod 2 minutely chelate or very protruding.................................................................................................3 The palm of gnathopod 2 subchelate or weakly protruding......................................................................................................4 3. The anterodorsal margin of the head forming an upturned ridge; posterodistal lobe of the basis of pereopod 7 very long...................................................................................................................... Eurythenes thurstoni Stoddart & Lowry, 2004 The anterodorsal margin of the head not forming an upturned ridge; palm of gnathopod 1 very short; posterodistal lobe of the basis of pereopod 7 short or fairly short................................................................................. Eurythenes atacamensis sp. nov. 4. Pereopods 6–7 and epimerons 1–3 not dorsally keeled to slightly keeled; pereopods 6–7 and epimerons 1–2 dorsally not sigmoid (without anterior concavity), epimeron 3 with distinct anterior concavity..................................................................5 Pereopods 6–7 and epimerons 1–3 dorsally strongly keeled and sigmoid (anteriorly slightly to distinctly concave)................................................................................... Eurythenes sigmiferus d’ Udekem d’ Acoz & Havermans, 2015 5. Eyes of variable width; the outer plate of maxilla 1 with 8/3 crown arrangement...................................................................6 Eyes of constant width; the outer plate of maxilla 1 with 9/3 crown arrangement.............................................................. Eurythenes aequilatus Narahara-Nakano, Nakano & Tomikawa, 2018 6. Article 2 of mandibular palp moderately to strongly expanded posteriorly..............................................................................7 Article 2 of mandibular palp not to weakly expanded posteriorly............................................................................................8 7. Maxilliped with 3 non-protruding nodular spines; pereopod 7 with basis posteriorly strongly expanded, with merus narrow..................................................................................... Eurythenes andhakarae d’ Udekem d’ Acoz & Havermans, 2015 Maxilliped with 8–9 non-protruding nodular spines; pereopod 7 with basis posterior border weakly expanded, with merus stout........................................................................................... Eurythenes maldoror d’ Udekem d’ Acoz & Havermans, 2015 8. Gnathopod 2 palm convex; uropod 1 and 2 rami subequal.......................................................................................................9 Gnathopod 2 palm straight; the outer ramus of uropod 1 and 2 are shorter than paired inner ramus......................................................................................................... Eurythenes magellanicus (H. Milne Edwards, 1848) 9. Ventral corner of eye rounded and obliquely pointing backward; maxilliped with 3–4 protruding nodular spines; gnathopod 1 palm convex....................................................................................................................… Eurythenes plasticus Weston, 2020a Ventral corner of eye sharp and pointing downward; maxilliped with 3–4 non-protruding nodular spines; gnathopod 1 palm straight…........................................................................................................ Eurythenes gryllus (Lichtenstein in Mandt, 1822) : Published as part of Weston, Johanna N. J., Espinosa-Leal, Liliana, Wainwright, Jennifer A., Stewart, Eva C. D., González, Carolina E., Linley, Thomas D., Reid, William D. K., Hidalgo, Pamela, Oliva, Marcelo E., Ulloa, Osvaldo, Wenzhöfer, Frank, Glud, Ronnie N., Escribano, Rubén & Jamieson, Alan J., 2021, Eurythenes atacamensis sp. nov. (Crustacea: Amphipoda) exhibits ontogenetic vertical stratification across abyssal and hadal depths in the Atacama Trench, eastern South Pacific Ocean, pp. 1-20 in Marine Biodiversity 51 (51) on page 12, DOI: 10.1007/s12526-021-01182-z, http://zenodo.org/record/5841926 : {"references": ["d' Udekem d' Acoz C, Havermans C (2015) Contribution to the systematics of the genus Eurythenes S. I Smith in Scudder 1882 (Crustacea: Amphipoda: Lysianassoidea: Eurytheneidae). Zootaxa 3971: 1 - 80. https: // doi. org / 10.11646 / zootaxa. 4196.3.9", "Chevreux E (1905) Description d' un amphipode (Katius obesus, nov. gen. et sp.), suivie d' une liste des amphipodes de la tribu des Gammarina ramenes par le filet a grand eouverture pendant la derniere campagne de la Princesse-Alice en 1904. Bull Inst Oceanogr Monaco 35: 1 - 7", "Stoddart HE, Lowry JK (2004) The deep-sea lysianassoid genus Eurythenes (Crustacea, Amphipoda, Eurytheneidae n. fam.). Zoosystema 26: 425 - 468", "Narahara-Nakano Y, Nakano T, Tomikawa K (2018) Deep-sea amphipod genus Eurythenes from Japan, with a description of a new Eurythenes species from off Hokkaido (Crustacea: Amphipoda: Lysianassoidea). Mar Biodivers 48: 603 - 620. https: // doi. org / 10. 1007 / s 12526 - 017 - 0758 - 4", "Milne Edwards H (1848) Sur un crustace amphipode, remarquable par sa grand etaille. Ann Sci Nat Zool 3: 98. https: // doi. org / 10.5962 / bhl. title. 15975", "Weston JNJ, Carrillo-Barragan P, Linley TD, Reid WDK, Jamieson AJ (2020 a) New species of Eurythenes from hadal depths of the Mariana Trench, Pacific Ocean (Crustacea: Amphipoda). Zootaxa 4748: 163 - 181. https: // doi. org / 10.11646 / zootaxa. 4748.1.9"]}