Tmetonyx Stebbing 1906

• Main Authors: Lowry, J. K., Kilgallen, N. M.
• Format: Text
• Language: unknown
• Published: Zenodo 2014
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Malacostraca; Amphipoda; Uristidae; Tmetonyx; Arctic; Norway; Lowry; Chevreux; North Atlantic
• Online Access: https://dx.doi.org/10.5281/zenodo.6319065; https://zenodo.org/record/6319065

Tmetonyx Stebbing 1906 (Fig. 48) Hoplonyx Sars, 1891: 91 (homonym, Coleoptera).— Stebbing, 1894: 9. Tmetonyx Stebbing 1906: 73 (new name).—J.L. Barnard, 1969: 365.— Barnard & Karaman, 1991: 441 (key), 535. Type species. Oniscus cicada O. Fabricius, 1780, original designation. Included species. Tmetonyx includes 8 species: T. acuta (G.O. Sars, 1891); T. albida (G.O. Sars, 1891); T. cicada (O. Fabricius, 1780); T. gulosa (Krøyer, 1845); T. leucophthalma (G.O. Sars, 1891); T. nardonis (Heller, 1867); T. palpiserrata Bellan-Santini, 1985; T. rotundata (Chevreux, 1926a); T. similis (G.O. Sars, 1891). Diagnostic description. Antenna 1 peduncle article 1 without anterodistal lobe; accessory flagellum with an elongate article 1 (at least twice as long as article 2) partially covering callynophore. Antenna 2 with weakly developed brush setae. Mandible molar a reduced column with convex, fully triturating surface. Maxilla 1 outer plate a well developed 7/4 crown. Maxilla 2 inner plate significantly shorter than outer plate. Gnathopod 1 subchelate coxa 1 large, about as long as coxa 2, subrectangular with straight anterior margin ischium long (length 2 × to 4 × breadth) carpus long (length 2 to 4 × breadth) propodus margins subparallel. Uropod 2 inner ramus not constricted . Telson deeply cleft. Remarks. Based on the subchelate gnathopod 1 with a fully developed coxa and long carpus Tmetonyx appears to be similar to Anonyx and Caeconyx . Tmetonyx differs from Anonyx in the accessory flagellum cap (present in Anonyx and Caeconyx ), the mandibular molar (setose with a vestigial triturating surface in Anonyx and Caeconyx ), gnathopod 1 ischium (short in Anonyx and Caeconyx ). Distribution. Atlantic Ocean: North Atlantic; North Polar Sea; Mediterranean Sea. : Published as part of 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), pp. 1-92 in Zootaxa 3867 (1) on pages 78-80, DOI: 10.11646/zootaxa.3867.1.1, http://zenodo.org/record/5585734 : {"references": ["Stebbing, T. R. R. (1906) Amphipoda. I. Gammaridea. Das Tierreich, 21, 1 - 806.", "Sars, G. O. (1891) An Account of the Crustacea of Norway, with Short Descriptions and Figures of all the Species. Vol. I. Amphipoda. Parts 4 - 9. Alb. Cammermeyer, Christiana, 144 pp., 48 pls. [pp. 69 - 212, pls. 225 - 272]", "Stebbing, T. R. R. (1894) The Amphipoda collected during the voyages of the Willem Barents in the Arctic Seas in the years 1880 - 1884. Bijdragen tot de Dierkunde, 17, 1 - 48, pls. 41 - 47.", "Barnard, J. L. (1969) The families and genera of marine gammaridean Amphipoda. Bulletin of the United States National Museum, 271, 1 - 535. http: // dx. doi. org / 10.1163 / 156854082 x 00632", "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", "Fabricius, O. (1780) Fauna Groenlandica, systematice sistens animalia Groenlandiae occidentalis hactenus indagata, quoad nomen specificum, triviale, vernaculumque; synonyma auctorum plurium, descriptionem, locum, victum, generationem, mores, usum, capturamque singuli, provt detegendi occasio fuit, maximaque parte secundum proprias observationes Othonis Fabricii. Hafniae et Lipsiae, 452 pp. http: // dx. doi. org / 10.5962 / bhl. title. 13489", "Kroyer, H. N. (1845) Karcinologiske Bidrag. Naturhistorisk Tidsskrift, Series 2, 1, 283 - 345, pls. 281 - 283; 403; 453 - 638, pls. 286, 287.", "Heller, C. (1867) Beitrage zur naheren Kenntniss der Amphipoden des Adriatischen Meeres. Denkschriften der Kaiserlichen Akademie der Wissenschaften, Wien. Mathematisch-Naturwissenschaftliche Klasse, 26, 1 - 62, pls. 61 - 64.", "Bellan-Santini, D. (1985) Amphipodes profonds de Mediterranee (Campagnes Biomede I, Polymede I et II). Bollettino del Museo Civico di Storia Naturale di Verona, 10, 263 - 313."]}