Pseudocallisoma platepistomum Andres 1977, comb. nov.

• Main Authors: Horton, Tammy, Thurston, Michael H.
• Format: Text
• Language: unknown
• Published: Zenodo 2015
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Malacostraca; Amphipoda; Scopelocheiridae; Pseudocallisoma; Pseudocallisoma platepistomum; Nares; Seta; Chevreux; Thurston; North Atlantic
• Online Access: https://dx.doi.org/10.5281/zenodo.5263164; https://zenodo.org/record/5263164

Pseudocallisoma platepistomum (Andres, 1977) comb. nov. Paracallisoma platepistomum Andres, 1977: 60 –64, figs 3, 4.— Andres & Lott 1977: 62.— Barnard & Karaman 1991: 511. Scopelocheirus coecus: — Shoemaker 1945: 186 (in part, part Pseudocallisoma coecum ). Type material. Holotype— female, 28 mm, Zoological Museum Hamburg, (K 30455), Meteor Station 3 /24, 11 March 1966, 42° 26.8 ’N 14 °49.0’W to 42 ° 40.9 'N 14 ° 49.2 'W, Agassiz trawl, 5325 m. Material examined . Iberian Basin. Station 7406 #33, 6 October 1970, 39° 49.9 ’ N 20 ° 13.1 ’ W to 39 ° 44.2 ’ N 20 ° 20.4 ’ W, RMT 8, 990 – 1250 m, one specimen. Station 7478 #1, 6 November 1970, 40° 10.8 ’ N 19 ° 58.9 ’ W to 40 °04.1’ N 19 °55.0’ W, RMT8, 1460– 2000 m, one specimen (NHMUK 2015. 2865). Nares Basin. Bermuda Oceanographic Expedition Net 1105, 25 July 1931, 32° 12 ’ N 64 ° 36 ’ W, metre net, 1463 m (Shoemaker 1945). Cape Verde Basin. Station 7089 #5, 12 November 1969, 17° 50 ’ N 25 ° 29 ’ W, RMT 8, 700 – 790 m, one specimen. Station 7089 #55, 22 November 1969, 17° 28 ’ N 24 ° 50 ’ W, RMT 90, 2000 – 1300 (–0), two specimens. Biscay Basin. Station 8508 #3, 13 April 1974, 44°29.0’ N 12 ° 29.9 ’ W to 44 °21.0’ N 12 ° 31.5 ’ W, RMT 8, 1000– 1250 m, one specimen. Diagnosis . Rostrum present, very short. Epistome straight with small, rounded process ventrally. Antenna 1, peduncle article 1 stout, conspicuously shorter than broad. Gnathopod 1, coxa 1 posterior margin weakly convex; dactylus, complex shrouded in setae. Gnathopod 2, oblique and palm acute, straight, bearing small, toothlike setae and lateral and medial submarginal setae. Coxa 4 posterodistal lobe large, relatively slender and narrowly rounded. Pereopod 6, basis posterior margin weakly sinuous, rounded distal lobe extending 30 % along merus. Epimeron 2 and 3 weakly toothed posteroventrally. Uropod 3, outer ramus article 2 short, 0.11 x article 1. Telson, each lobe with three short submarginal setae. Remarks . Pseudocallisoma platepistomum can be distinguished from P. coecum in the following features: antenna 1, peduncle article 1 much broader than long, length 0.65 x width (vs. nearly as broad as long, length 0.9 x width); gnathopod 1, coxa posterior margin convex ( vs . concave), setation of complex dactylus only rising from distal margin of basal part ( vs . hood-shaped protuberance above unguis densely setose); gnathopod 2, straight palm with small, tooth-like setae and lateral/medial submarginal setules ( vs . sinuous, row of setules); coxa 4, posterodistal lobe large, narrowly rounded ( vs . stout, broadly rounded); pereopod 6, basis posterior margin slightly concave ( vs . straight); uropod 3, outer ramus article 2 very short, length 0.11 x article 1 (vs. 0.23 x); telson with three small robust setae laterally ( vs . one basal robust seta). As both species in the genus appear to be meso- and bathypelagic, the specimen recorded from 5325 m (Andres 1977) may have been caught in midwater during deployment/recovery of the net rather than the seafloor. Depth range. 790–2000 (5325) m (Shoemaker 1945, Andres 1977). Distribution. North Atlantic Ocean : Iberian Basin (Andres 1977); off Bermuda (Shoemaker 1945), Cape Verde Basin, Biscay Basin. : Published as part of Horton, Tammy & Thurston, Michael H., 2015, A revision of the genus Paracallisoma Chevreux, 1903 (Crustacea: Amphipoda: Scopelocheiridae: Paracallisominae) with a redescription of the type species of the genus Paracallisoma and the description of two new genera and two new species from the Atlantic Ocean, pp. 91-132 in Zootaxa 3995 (1) on pages 127-128, DOI: 10.11646/zootaxa.3995.1.12, http://zenodo.org/record/233262 : {"references": ["Andres, H. G. & Lott, N. (1977) Verzeichnis der Typen aus der Sammlung Crustacea des Zoologischen Instituts und Zoologischen Museums der Universitat Hamburg. Amphipoda, Gammaridea. Mitteilungen aus dem Hamburgischen Zoologischen Museum und Institut, 74, 53 - 64.", "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 - 7387.13.1991.91", "Shoemaker, C. (1945) The Amphipoda of the Bermuda Oceanographic Expeditions, 1929 - 1931. Zoologica, Scientific Contributions of the New York Zoological Society, 30, 185 - 266."]}