Maera Leach 1814

• Main Author: Ariyama, Hiroyuki
• Format: Text
• Language: unknown
• Published: Zenodo 2020
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Malacostraca; Amphipoda; Melitidae; Maera; Pacific; Indian; Myers; Seta; Manan; Lowry; Chevreux; Montagu; Brewster; North Atlantic
• Online Access: https://dx.doi.org/10.5281/zenodo.3691386; https://zenodo.org/record/3691386

Maera Leach, 1814 [Japanese name: Hon-sunnariyokoebi-zoku, new] Maera Leach, 1814: 403.— Barnard, 1969b: 243 (in part).—G. Karaman & Ruffo, 1971: 113 (in part).— Barnard & Barnard, 1983: 622 (in part).— Krapp-Schickel & Jarrett, 2000: 26.— Krapp-Schickel, 2008a: 14.— Lowry & Myers, 2013: 36. Type species. Cancer ( Gammarus ) grossimanus Montagu, 1808, monotypy. Emended diagnosis. Body smooth. Head , rostrum obsolescent, lateral cephalic lobe rounded, antennal sinus distinct, anteroventral corner usually produced; eyes usually present, reniform or oval. Antennae slender; antenna 1, peduncular articles 1–2 longer than article 3, accessory flagellum with 4–11 articles. Mandible , molar developed; palp article length 2>3>1 or 2=3>1, article 1 with acute distal tooth or obliquely lengthened. Maxilla 1 , inner plate bullet-shaped; palp 2-articulate. Coxae short; anteroventral corner of coxa 1 produced or rounded, coxae 5–6 lobate; gills present on coxae 2–6, oostegites present on coxae 2–5. Gnathopod 1 smaller than gnathopod 2, subchelate; carpus longer than or subequal to propodus; palm oblique. Gnathopod 2 large in both sexes, symmetrical, subchelate; carpus short, slightly lobate; propodus large, length 1.3–2.0 times width; palm slightly or moderately oblique, defined by small tooth, sculptured; dactylus with many setae (=> 8) on anterior margin. Pereopods , dactyli simple or bifid; pereopods 3–4 slender; bases of pereopods 5 – 7 rectangular or weakly expanded, each with posterodistal corner square or rounded. Pleonal epimeron 3 with small tooth or projected acutely posteroventrally. Uropods biramous; uropod 1 peduncle with basofacial robust seta, rami subequal, with marginal and distal robust setae; uropod 2 similar to uropod 1, both rami bearing marginal and distal robust setae; uropod 3, rami usually subequal in length, outer ramus 1.0 – 2.6 times length of peduncle, distal margins of rami truncate, with a few to many robust setae, longest seta about 0.1 – 0.9 times length of outer ramus. Telson deeply incised, distal margins of both lobes usually with notch, longest apical seta 0.1 – 0.9 times as long as telson. Included species (19). Maera anoculata Rabindranath, 1983; M. bousfieldi Krapp-Schickel & Jarrett, 2000; M. danae (Stimpson, 1853); M. edwardsi Chevreux, 1927; M. fusca (Bate, 1864); M. grossimana (Montagu, 1808); M. hirondellei Chevreux, 1900; M. irregularis Myers & Nithyanandan, 2016; M. jerrica Krapp-Schickel & Jarrett, 2000; M. loveni (Bruzelius, 1859); M. lucinae Krapp-Schickel, 2004; M. nelsonae Krapp-Schickel & Jarrett, 2000; M. pachytelson G. Karaman & Ruffo, 1971; M. sagamiensis sp. nov. M. schieckei G. Karaman & Ruffo, 1971; M. similis Stout, 1913; M. sodalis G. Karaman & Ruffo, 1971; M. tenera Sars, 1885; M. umarae García-Madrigal, 2010. Remarks. Species of this genus can be readily distinguished from the other species in the Maera -clade by the setose dactylus of the gnathopod 2. The dactylus in Clessidra Krapp-Schickel &Vader, 2009 has 3–4 setae and those in the other genera have only a single seta. Although Krapp-Schickel (2008a) included Maera tinkerensis Kunkel, 1910 in the genus, this species was removed to Clessidra (Krapp-Schickel &Vader 2009). : Published as part of Ariyama, Hiroyuki, 2020, Species of the Maera - clade collected from Japan. Part 3: genera Maera Leach, 1814, Meximaera Barnard, 1969 and Orientomaera Ariyama, 2018 (addendum), with a key to Japanese species of the clade (Crustacea: Amphipoda: Maeridae), pp. 451-479 in Zootaxa 4743 (4) on page 452, DOI: 10.11646/zootaxa.4743.4.1, http://zenodo.org/record/3690502 : {"references": ["Leach, W. E. (1814) Crustaceology. In: Brewster, D. (Ed.), The Edinburgh Encyclopaedia. Vol. 7. William Blackwood, Edinburgh, pp. 383 - 437.", "Barnard, J. L. (1969 b) The families and genera of marine gammaridean Amphipoda. Bulletin of the United States National Museum, 271, 1 - 535.", "Karaman, G. & Ruffo, S. (1971) Contributo alla conoscenza della specie Mediterranee del genere Maera. Memorie del Museo Civico di Storia Naturale, Verona, 19, 113 - 176.", "Barnard, J. L. & Barnard, C. M. (1983) Freshwater Amphipoda of the World. I. Evolutionary Patterns and II. Handbook of Bibliography. Hayfield Associates, Mt. Vernon, Virginia, 830 pp.", "Krapp-Schickel, T. & Jarrett, N. E. (2000) The amphipod family Melitidae on the Pacific coast of North America. Part II. The Maera - Ceradocus complex. Amphipacifica, 2, 23 - 61.", "Krapp-Schickel, T. (2008 a) What has happened with the Maera - clade (Crustacea, Amphipoda) during the last decades? Bollettino del Museo Civico di Storia Naturale di Verona, 32, 3 - 32.", "Lowry, J. K. & Myers, A. A. (2013) A phylogeny and classification of the Senticaudata subord. nov. (Crustacea: Amphipoda). Zootaxa, 3610 (1), 1 - 80. https: // doi. org / 10.11646 / zootaxa. 3610.1.1", "Montagu, G. (1808) Description of several marine animals found on the south coast of Devonshire. Transactions of the Linnean Society of London, 9, 81 - 114, pls. 2 - 8. https: // doi. org / 10.1111 / j. 1096 - 3642.1818. tb 00327. x", "Rabindranath, P. (1983) A new blind gammarid amphipod (Crustacea) from the Indian region. In: John, P. A. (Ed.), Selected Papers on Crustacea, The Aquarium, Trivandrum, pp. 189 - 194.", "Stimpson, W. (1853) Synopsis of the marine Invertebrata of Grand Manan: or the region about the mouth of the Bay of Fundy, New Brunswick. Smithsonian Contributions to Knowledge, 6, 5 - 66, 3 pls. https: // doi. org / 10.5962 / bhl. title. 30062", "Chevreux, E. (1927) Crustaces Amphipodes. Expedition scientifiques du \" Travailleur \" et du \" Talisman \" pendant les annees 1880, 1881, 1882, 1883, 9, 41 - 152, pls. 1 - 14.", "Bate, C. S. (1864) Characters of new species of crustaceans discovered by J. K. Lord on the coast of Vancouver Island. Proceedings of the Zoological Society of London, 1864, 661 - 668.", "Chevreux, E. (1900) Amphipodes provenant des campagnes de l'Hirondelle (1885 - 1888). Resultats des Campagnes Scientifiques accomplies sur son Yacht par Albert I er Prince Souverain de Monaco, 16, 1 - 195, 18 pls.", "Myers, A. A. & Nithyanandan, M. (2016) The Amphipoda of Sea City, Kuwait. The Senticaudata (Crustacea). Zootaxa, 4072 (4), 401 - 429. https: // doi. org / 10.11646 / zootaxa. 4072.4.1", "Bruzelius, R. M. (1859) Bidrag till kannedomen om skandinaviens Amphipoda Gammaridea. Kongliga Svenska Vetenskaps- Akademiens Handlingar, New Series, 3 (1), 1 - 104, 4 pls. https: // doi. org / 10.5962 / bhl. part. 28297", "Krapp-Schickel, T. (2004) Sorting of the old \" Maera sensu lato \" - flock continues: three members change to three different genera. Bollettino del Museo Civico di Storia Naturale di Verona, 28, 23 - 38.", "Stout, V. R. (1913) Studies in Laguna Amphipoda. II. Zoologische Jahrbucher, 34, 633 - 659. https: // doi. org / 10.5962 / bhl. part. 19898", "Sars, G. O. (1885) Zoology, Crustacea, I. Norwegian North-Atlantic Expedition 1876 - 1878, 6, 1 - 280, 21 pls.", "Garcia-Madrigal, M. S. (2010) Littoral Maeridae and Melitidae (Amphipoda: Gammaridea) from the Gulf of Tehuantepec, Mexico. Zootaxa, 2623 (1), 1 - 51. https: // doi. org / 10.11646 / zootaxa. 2623.1.1", "Krapp-Schickel, T. & Vader, W. (2009) On some maerid genera (Crustacea, Amphipoda, Maeridae) collected by the Hourglass Cruise (Florida). Part 1. genera Anamaera, Ceradocus, Clessidra gen. nov., Jerbarnia, Maera, Meximaera, with a key to world Ceradocus. Journal of Natural History, 43, 2057 - 2086. https: // doi. org / 10.1080 / 00222930903091007", "Kunkel, B. W. (1910) The Amphipoda of Bermuda. Transactions of the Connecticut Academy of Arts and Sciences, 16, 1 - 116."]}