Alexandrella schellenbergi

• Main Authors: d'Acoz, Cédric d'Udekem, Verheye, Marie L.
• Format: Text
• Language: unknown
• Published: Zenodo 2017
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Malacostraca; Amphipoda; Stilipedidae; Alexandrella; Alexandrella schellenbergi; Antarctic; Southern Ocean; The Antarctic; Antarctic Peninsula; Ross Sea; South Shetland Islands; Argentine; Lowry; Adélie Coast; Antarc*; ren
• Online Access: https://dx.doi.org/10.5281/zenodo.3857598; https://zenodo.org/record/3857598

Alexandrella schellenbergi (Holman & Watling, 1983) Bathypanoploea schellenbergi Holman & Watling, 1983: 47 (in part: holotype only) figs 11a–e only (not figs 9, 10, 11f–h: presumably A. pulchra and Alexandrella sp. 1). Iphimediopsis australis – Schellenberg 1931: 127, pl. 1 fig. c. Bathypanoploea australis – Schellenberg 1939: 137 (footnote, by implication). non Acanthonotozoma australis Chilton, 1912: 205, pl. 2 fig. 19. Distribution Sub-Antarctic Region: south of Argentine Basin: north east of Falkland Islands: 50°19ʹ S, 50°50ʹ W, 2675 m (Holman & Watling 1983). Remarks It has been reported that Alexandrella schellenbergi has a very wide geographical and bathymetric distribution across the Southern Ocean (Holman & Watling 1983, Berge & Vader 2005b, 2005 c, De Broyer et al. 2007). This widespread distribution is questioned here. The holotype of A. schellenbergi was collected north of the Antarctic Polar Front and north of the line joining the Falkland Islands to South Georgia, at 2675 m. Its telson is more deeply cleft than in similar Alexandrella specimens from the continental shelf of the South Shetland Islands and the tip of the Antarctic Peninsula. This telson character state is consistent with the specimens illustrated in literature (Holman & Watling 1983, Ren & Huang 1991) and examined by us. On the poor quality photograph given by Schellenberg (1931), the posterior pereiopods also appear more slender than in the forms of the Antarctic continental shelf; however, this might be an illusion created by the possibly not flattened orientation of the legs on the picture. The telson difference, the geographical wide separation and the bathymetric differences suggest that two species are involved. The name Alexandrella pulchra Ren in Ren & Huang, 1991 is available for the form of the South Shetland Islands and the tip of the Antarctic Peninsula, and it is herein resurrected for them. All topotypical shelf specimens of Alexandrella pulchra examined by us were devoid of posterodorsal tooth on pereionite 6. However, specimens similar to A. schellenbergi with a tooth on pereionite 6 are present in the Ross Sea (Holman & Watling 1983: 49, fig. 10a), off Adélie Coast (present material) and in the Atlantic sector of the Southern Ocean (Rauschert & Arntz 2015). They are treated herein as a separate taxon: Alexandrella sp. 1. : Published as part of d'Acoz, Cédric d'Udekem & Verheye, Marie L., 2017, Epimeria of the Southern Ocean with notes on their relatives (Crustacea, Amphipoda, Eusiroidea), pp. 1-553 in European Journal of Taxonomy 359 on page 175, DOI: 10.5852/ejt.2017.359, http://zenodo.org/record/3855694 : {"references": ["Holman H. & Watling L. 1983. A revision of the Stilipedidae (Amphipoda). Crustaceana 44 (1): 29 - 53. https: // doi. org / 10.1163 / 156854083 x 00037", "Schellenberg A. 1931. Gammariden und Caprelliden des Magellangebietes, Sudgeorgiens und der Westantarktis. Further zoological results of the Swedish Antarctic Expedition 1901 - 1903 2 (6): 1 - 290, pl. 1.", "Schellenberg A. 1939. Amphipoden des Kongo-Mundungsgebietes. Revue de Zoologie et de Botanique Africaine 32: 122 - 138.", "Chilton C. 1912. The Amphipoda of the Scottish National Antarctic Expedition. Transactions of the Royal Society of Edinburgh 48 (3): 455 - 520, pls 1 - 2. http: // biodiversitylibrary. org / page / 41769498 [accessed 27 Sep. 2016].", "Berge J. & Vader W. 2005 b. On the taxonomic status of the Antarctic amphipod crustacean genera Eclysis (Astyridae) and Bathypanoploea (Stilipedidae), with partial redescription of their type species and description of Bathypanoploea polarsterni n. sp. Organisms, Diversity & Evolution 5: 81 - 83. https: // doi. org / 10.1016 / j. ode. 2004.05.002", "Berge J. & Vader W. 2005 c. On the taxonomic status of the Antarctic amphipod crustacean genera Eclysis (Astyridae) and Bathypanoploea (Stilipedidae), with partial redescription of their type species and description of Bathypanoploea polarsterni n. sp. Organisms, Diversity & Evolution 5, Electronic Supplement 3: 1 - 15. Available from http: // www. senckenberg. de / odes / 05 - 03. htm [accessed 27 Sep. 2016].", "De Broyer C., Lowry J. K., Jazdzewski K. & Robert H. 2007. Catalogue of the Gammaridean and Corophiidean Amphipoda (Crustacea) of the Southern Ocean with distribution and ecological data. Synopses of the Amphipoda of the Southern Ocean 1: 1 - 325. Institut Royal des Sciences Naturelles de Belgique, Brussels. Available from www. marinespecies. org / aphia. php? p = sourceget & id = 10098 [accessed 27 Sep. 2016].", "Ren X. & Huang L. 1991. Studies on Gammaridea and Caprellidea (Crustacea: Amphipoda) from the northwest waters off the Antarctic Peninsula. Studia Marina Sinica 32: 185 - 323.", "Rauschert M. & Arntz W. E. 2015. Antarctic Macrobenthos. A Field Guide of the Invertebrates Living at the Antarctic Seafloor: Arntz & Rauschert Selbstverlag, Deichweg."]}