Ischnomesus Richardson 1908
Description
Ischnomesus Richardson, 1908
Ischnosoma: G. O. Sars, 1868: 84.
Ischnomesus: Richardson, 1908: 81; Hansen, 1916: 56; Gurjanova, 1932: 40 l; Wolff, 1956: 88; Menzies, 1962: 111; Wolff, 1962: 73; Menzies & George, 1972: 971; Kussakin, 1988: 419; Merrin & Poore, 2003: 290.
Rhabdomesus: Richardson, 1908: 81.
Bactromesus: Wolff, 1962: 83.
Type species: Ischnosoma bispinosum G. O. Sars, 1868 (by monotypy).
Species included: Ischnomesus anacanthus Wolff, 1962; I. andriashevi Birstein, 1960; I. antarcticus Schultz, 1979; I. armatus Hansen, 1916; I. bacilloides (Beddard, 1886); I. bacillopsis (Barnard, 1920); I. bacillus (Beddard, 1886); I. bidens Menzies, 1962; I. birsteini Wolff, 1962; I. bispinosus (G. O. Sars, 1868); I. bruuni Wolff, 1956; I. calcificus Menzies & George, 1972; I. caribbicus Menzies, 1962; I. carolinae Chardy, 1974; I. chardyi Kussakin, 1988; I. decemspinosus Menzies, 1962; I. elegans Menzies, 1962; I. elongatus Birstein, 1963; I. fragilis Birstein, 1971; I. glabra Kensley, 1984; I. gracilis (Birstein, 1960); I. justi Merrin & Poore, 2003; I. latimanus Birstein, 1971; I. magnificus Menzies, 1962; I. multispinis Menzies, 1962; I. norvegicus Svavarsson, 1984; I. paucispinis Menzies, 1962; I. planus Wolff, 1962; I. profundus Hansen, 1916; I. roseus Wolff, 1962; I. simplex Menzies & George, 1972; I. simplissimus Menzies, 1962; I. spaercki Wolff, 1956; I. tasmanensis Merrin & Poore, 2003; I. vinogradovi Birstein, 1963 and I. wolffi Menzies, 1962.
Diagnosis. Pereonites 5–7, pleonite 1 and pleotelson freely articulating. Antennula of at least 6 articles. Maxillipedal palp width equal to or wider than basal endite. Pereopod I carpus with weakly expanded palm. Uropods uniramous, biarticulate.
Remarks. The freely articulating posterior pereonites, pleonite 1 and pleotelson observed in Ischnomesus is a condition presumed to be plesiomorphic, with other genera showing various degrees of fusion of the pereonites (e.g. pereonites 5–7 and pleotelson fused together in genus Haplomesus; see Kavanagh & Wilson 2007). Uniarticulate uropods have been described by Merrin & Poore (2003) for Ischnomesus justi. As this species displays all the other diagnostic characters that characterise Ischnomesus, biarticulate uropods may not be a diagnostic character for the genus. However, as all remaining 35 species and I. harrietae sp. nov. possess uropods with two articles, we have retained it as a generic character until further information on the occurrence of uniarticulate uropods becomes available through the description of additional species.
Notes
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Linked records
Additional details
Identifiers
Biodiversity
- Family
- Ischnomesidae
- Genus
- Ischnomesus
- Kingdom
- Animalia
- Order
- Isopoda
- Phylum
- Arthropoda
- Scientific name authorship
- Richardson
- Taxon rank
- genus
- Taxonomic concept label
- Ischnomesus Richardson, 1908 sec. Kavanagh, Frutos & Sorbe, 2015
References
- Richardson, H. (1908) Some new Isopoda of the superfamily Aselloidea from the Atlantic coast of North America. Proceedings of the U. S. National Museum, 35, 71 - 86. http: // dx. doi. org / 10.5479 / si. 00963801.35 - 1633.71
- Sars, G. O. (1868) Beretning om en i Sommeren 1865 foretagen zoologisk Reise ved Kysterne af Christianias of Christiansands Stifter. Nyt Magazin for Naturvidenskaberne, Christiania, 15, 84 - 128.
- Hansen, H. J. (1916) Crustacea Malacostraca III. The order Isopoda. The Danish Ingolf Expedition, 3 (5), 1 - 262.
- Gurjanova, E. (1932) ' Tableaux analytiques de la faune de l'URSS, publies par l'Institut Zoologique de l'Academie des Sciences. Les isopodes des mers arctiques'. Leningrad, 181 pp.
- Wolff, T. (1956) Isopoda from depths exceeding 6000 metres. Galathea Report, 2, 85 - 157.
- Wolff, T. (1962) The systematics and biology of bathyal and abyssal Isopoda Asellota. Galathea Report, 6, 7 - 320.
- Menzies, R. J. & George, R. Y. (1972) Isopod Crustacea of the Peru - Chile Trench. Anton Bruun Report, 9, 1 - 124.
- Kussakin, O. G. (1988) Marine and brackish-water Crustacea (Isopoda) of cold and temperate waters of the Northern Hemisphere. 3. Suborder Asellota 1. Janiridae, Santiidae, Dendrotionidae, Munnidae, Haplomunnidae, Mesosignidae, Haploniscidae, Mictosomatidae, Ischnomesidae. Opredeliteli po Faune SSR, Akademiya Nauk, SSR, 152, 1 - 501.
- Merrin, K. & Poore, G. C. B. (2003) Four new species of Ischnomesidae (Crustacea: Isopoda: Asellota) from off south-eastern Australia. Memoirs of Museum Victoria, 60, 285 - 307.
- Chardy, P. (1974) Complements a l'etude systematique des Ischnomesidae (Isopodes Asellotes) de l'Atlantique. Description de quatre especes nouvelles. Bulletin du Museum National d'Histoire Naturelle, 257, 1537 - 1552.
- Birstein, J. A. (1971) Fauna of the Kurile-Kamchatka Trench. Additions to the fauna of isopods (Crustacea, Isopoda) of the Kurile-Kamchatka Trench. Part II. Asellota 2. Trudy Instituta Okeanogiya, Akademiya Nauk SSSR, Moscow, 92, 162 - 238.
- Svavarsson, J. (1984) Ischnomesidae (Isopoda) from bathyal and abyssal depths in the Norwegian and North Polar Seas. Sarsia, 69, 25 - 36.
- Kavanagh, F. A. & Wilson, G. D. F. (2007) Revision of the genus Haplomesus (Isopoda: Asellota: Ischnomesidae) with erection of four new genera. Invertebrate Systematics, 21, 487 - 535. http: // dx. doi. org / 10.1071 / is 06031