Pseudonesimus Chevreux 1926

• Main Authors: Kilgallen, N. M., Lowry, J. K.
• Format: Text
• Language: unknown
• Published: Zenodo 2014
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Malacostraca; Amphipoda; Lysianassidae; Pseudonesimus; Baja; Pacific; Seta; Lowry; Chevreux; Arctique*; North Atlantic
• Online Access: https://dx.doi.org/10.5281/zenodo.4909710; https://zenodo.org/record/4909710

Pseudonesimus Chevreux, 1926 Pseudonesimus Chevreux, 1926: 3.— Chevreux, 1935: 13.—J.L. Barnard, 1961: 50. Aristiopsis J.L. Barnard, 1961: 30.―J.L. Barnard, 1969: 299, 306, 310, 311, 314 (key), 324.― Barnard & Karaman, 1991: 467. (type species Aristiopsis tactius J.L. Barnard, 1961, original designation). Schisturella .―J.L. Barnard, 1969: 361 (in part).― Barnard & Karaman, 1991: 526 (in part). Type species. Pseudonesimus abyssi Chevreux, 1926, by monotypy. Included species. Pseudonesimus includes seven species: P. abyssi Chevreux, 1926; P. cedrosianus (J.L. Barnard, 1967); P. parachelatus (Ledoyer, 1986); P. robustus (J.L. Barnard, 1961); P. tacitus (J.L. Barnard, 1961); P. tasmanensis J.L. Barnard, 1961; P. zopa (J.L. Barnard, 1966). Diagnostic description. Antenna 1 flagellum article 1 lacking robust seta on distal margin; accessory flagellum forming cap. Antenna 2 flagellum articles 3–5 slender in female and (?) male, with weak brush setae on the anterior margin or brush setae absent. Mandibular incisor curved; molar with reduced column and convex triturating surface (button); palp attached midway. Maxilla 1 ST-7 serrate along the distomedial margin; ST-D slender, apically cuspidate. Maxilliped outer plate with apical robust setae. Gnathopod 1 subchelate; coxa vestigial; carpus subequal or slightly longer than propodus; propodus palm transverse, convex. Pereopod 4 coxa with well developed posteroventral lobe. Uropod 2 inner ramus constricted. Uropod 3 rami without plumose setae. Telson moderately to slightly cleft. Remarks. Pseudonesimus was originally described by Chevreux (1926) to accommodate the north Atlantic species Pseudonesimus abyssi . Aristiopsis was later described by Barnard (1961) for Aristiopsis tacitus . Barnard did not associate A. tacitus with Pseudonesimus , and did not draw any comparison between the two genera in his assessment of their relationships with other taxa. Thus, Pseudonesimus remained a monotypic genus (with two subspecies) for more than 40 years until it was eventually placed in the synonymy of Schisturella by Barnard (1967) where it has since remained. Based on the lack of a robust seta on the distal margin of antenna 1 flagellum article 1, the relative length of the gnathopod 1 carpus and propodus, the strongly subchelate, transverse and convex gnathopod 1 palm, and the cleftness of the telson we consider Pseudonesimus to be distinct from Schisturella , and congeneric with Aristiopsis . In accordance with the Principle of Priority (ICZN 1999: Article 23) Aristiopsis thus becomes a junior synonym of Pseudonesimus . Distribution. Atlantic and Pacific Oceans. : Published as part of Kilgallen, N. M. & Lowry, J. K., 2014, The Tryphosa group (Crustacea: Amphipoda: Lysianassoidea: Lysianassidae: Tryphosinae), pp. 501-545 in Zootaxa 3768 (5) on page 511, DOI: 10.11646/zootaxa.3768.5.1, http://zenodo.org/record/4909684 : {"references": ["Chevreux, E. (1926) Diagnoses d'amphipodes nouveaux provenant des campagnes de la \" Princesse-Alice \", dans l'Atlantique et dans l'Ocean Arctique. Lysianassidae. Bulletin de l'Institut Oceanographique, Monaco, 475, 1 - 12.", "Chevreux, E. (1935) Amphipodes provenant des campagnes du Prince Albert Ier de Monaco. Resultats des Campagnes Scientifiques Accomplies sur son Yacht par Albert Ier Prince Souverain de Monaco, 90, 1 - 214, pls 1 - 16.", "Barnard, J. L. (1961) Gammaridean Amphipoda from depths of 400 to 6000 meters. Galathea Report, 5, 23 - 128.", "Barnard, J. L. (1969) The families and genera of marine gammaridean Amphipoda. Bulletin of the United States National Museum, 271, 1 - 535, 173 figs.", "Barnard, J. L. & Karaman, G. S. (1991) The families and genera of marine gammaridean Amphipoda (except marine gammaroids). Records of the Australian Museum, Supplement, 13, 1 - 866. http: // dx. doi. org / 10.3853 / j. 0812 - 7387.13.1991.367", "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", "Ledoyer, M. (1986) Crustaces Amphipodes Gammariens. Familles des Haustoriidae a Vitjazianidae. Faune de Madagascar, 59, 599 - 1112.", "Barnard, J. L. (1966) Submarine canyons of southern California. Part V. Systematics: Amphipoda. Allan Hancock Pacific Expeditions, 27, 1 - 166.", "ICZN (1999) International Code of Zoological Nomenclature. 4 th Edition. Internatinoal Trust for Zoological Nomenclature, London, 306 pp. Available from: http: // www. nhm. ac. uk / hosted-sites / iczn / code / (accessed 11 Nov. 2013)"]}