Leptognathia G.O. Sars 1882
Creators
Description
Genus Leptognathia G.O. Sars, 1882
Gender. Feminine.
Type species. Tanais breviremis Lilljeborg, 1864.
Diagnosis. Female. Cheliped fixed finger and dactylus simple. Uropodal exopod with one article.
Remarks. Although a full scale revision of the Leptognathia is not within the scope of this study, a few changes are justified here. The genus Leptognathia is generally considered paraphyletic- rather than a monophyletic taxon (Sieg 1986a; Larsen 2005) and is often treated as a repository for ‘unidentifiable’ and poorly described deep-sea tanaidomorphans. According to Anderson et al. (2006) the genus Leptognathia currently contain 39 morphologically heterogeneous species of which most are very poorly described.
Bird and Holdich (1984) initiated the first serious attempt of a solution by removing and organizing a number of leptognathid species into separate genera. Sieg (1986b), by redescribing the type species L. breviremis Lilljeborg, 1864, provided a much needed platform for a continuation of this effort, by giving a reference point to a more precise diagnosis to the Leptognathiidae. A more restrictive diagnosis of the Leptognathiidae was given by Larsen & Wilson (2002) and of Leptognathia by Larsen (2005), but a number of problems still plagues this genus. One of these problems is a large number of poorly described species, of which many do not correspond to the narrower definition of Leptognathia sensu Larsen. In order to identify the Leptognathia species described below, several of these non- Leptognathia sensu stricto species were identified and are here removed from the Leptognathia, although final genus designation for many species will have to await a more detailed revision.
The following species are removed from Leptognathia as they posses a biarticulated uropodal exopod: Leptognathia arctophylax (Norman & Stebbing, 1886); L. distincta Kudinova-Pasternak, 1981; L. elegans Kudinova-Pasternak, 1965; L. greveae Kudinova-Pasternak, 1976; L. mironovi Kudinova-Pasternak, 1981; L. parabranchiata Kudinova-Pasternak, 1977 *; L. paraelegans Kudinova-Pasternak, 1970; L. tuberculata Hansen, 1913 and L. voeringi (G.O. Sars, 1877), A new leptognathidean genus Biarticulata is here erected to accommodate these species. L. tuberculata may not belong to the Leptognathiidae at all as the structure of the molar is unknown.
Another new leptognathidean genus Forcipatia is erected to receive L. rotundicauda Kudinova-Pasternak, 1970; Leptognathia longimanus Larsen, 2005; and L. sp G. (currently undescribed, G. Bird, pers. comm.).
Leptognathia angustocephala Kudinova-Pasternak, 1975 a; L. birsteini Kudinova-Pasternak, 1965; L. lineate Shiino, 1978; linearis (Hansen, 1913); L. microcephala Kudinova-Pasternak, 1977 *; and L. zenkevitchi Kudinova-Pasternak, 1970 are completely removed from the family Leptognathiidae as they have broad mandibular molars.
Also removed from the family is L. profunda Hansen, 1913, which have a spiniform exopodal process and probably belongs to Araphura Bird & Holdich, 1984.
Leptognathia vinogradovae Kudinova-Pasternak, 1970; L. indivisa (Hansen, 1913) and L. paramanca Lang, 1958, which have uniramous uropods, are also removed from the family.
Furthermore, L. dentifera G.O. Sars, 1896 and L. uncinata Hansen, 1913 both possess a biarticulated uropodal exopod and a spiniform process on the uropodal basal articles as well as a cheliped carpal shield, and are here transferred to Tumidochelia (see above).
These removals reduced the number of species in the Leptognathia to eight verified species: L. bamberi n. sp; L. breviremis Lilljeborg, 1864; L. breviremoides Sieg, 1986 b; L. glandiceps Shiino, 1978; L. gyreae Larsen, 2005; L. longa (Kudinova-Pasternak, 1982); L. manca G.O. Sars, 1882; and L. vitjazi (Kudinova-Pasternak, 1982) and nine species inceta sedis, which may belong to Leptognathia but were the molar structures are not known: L. langi Kudinova-Pasternak, 1970; L. zezinae Kudinova-Pasternak, 1973; L. acanthifera Hansen, 1913; L. crassa Hansen, 1913; L. tenella Hansen, 1913; L. ventralis Hansen, 1913; L. abyssorum (Dollfus, 1897); L. luykeni Vanhöffen, 1914; L. vanhoeffeni Gutu, 1972.
Other
Published as part of Larsen, Kim & Shimomura, Michitaka, 2007, Tanaidacea (Crustacea: Peracarida) from Japan. II. Tanaidomorpha from the East China Sea, the West Pacific Ocean and the Nansei Islands, pp. 1-43 in Zootaxa 1464 on pages 14-15, DOI: 10.5281/zenodo.176517Files
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Linked records
Additional details
Identifiers
Related works
- Is part of
- Journal article: 10.5281/zenodo.176517 (DOI)
- Journal article: http://publication.plazi.org/id/A768D631E12DE21BFFC5FFF0574EFFB6 (URL)
- Is source of
- https://sibils.text-analytics.ch/search/collections/plazi/5B51AE49E120E215FF52FB8554ADFBC4 (URL)
Biodiversity
- Family
- Leptognathiidae
- Genus
- Leptognathia
- Kingdom
- Animalia
- Order
- Tanaidacea
- Phylum
- Arthropoda
- Scientific name authorship
- G.O. Sars
- Taxon rank
- genus
- Taxonomic concept label
- Leptognathia Sars, 1882 sec. Larsen & Shimomura, 2007
References
- Sars, G. O. (1882) Revision af gruppen Chelifera med charakteristik af nye herhen horende arter og slaegter. Archiv for Matematik og Naturvidenskab, 7, 1 - 54.
- Lilljeborg, W. (1864) Bidrag till kannedomen om de inom Sverige och Norrige forekommande crustaceer af isopodernas underordning och tanaidernas familj. Inbjudningsskrifter Universitet i Uppsala, Uppsala. Pp. 31.
- Sieg, J. (1986 a) Crustacea Tanaidacea of the Antarctic and Subantarctic, 1, On material collected at Tierra del Fuego, Isla de los Estados, and the west coast of the Antarctic Peninsula. Biology of the Antarctic Seas, 45, 1 - 180.
- Larsen, K. (2005). Deep-Sea Tanaidacea (Crustacea; Peracarida) from the Gulf of Mexico. Crustacean Monographs, 5, Brill, Leiden, 381 pp.
- Anderson, G., Heard, R. W., & Larsen, K. (2006) Tanaidacea Home Page. <http: // tidepool. st. usm. edu / tanaids> Accessed on 1 September 2006.
- Bird, G. J. & Holdich, D. M. (1984) New deep-sea leptognathiid tanaids (Crustacea, Tanaidacea) from the north-east Atlantic. Zoologica Scripta, 13, 285 - 315.
- Sieg, J. (1986 b) Tanaidacea (Crustacea) von der Antarktis und Subantarktis. II. Tanaidacea gesammelt von Dr. J. W. Wagele wahrend der Deutschen Antarktis Expedition 1983. Mitteilung en aus der Zoologischen Museum der Universitat Kiel, 2 (4), 1 - 80.
- Larsen, K. & Wilson, G. D. F. (2002) Tanaidacean phylogeny. The first step: The superfamily Paratanaidoidea. Journal of Zoological Systematics and Evolutionary Research, 40 (4), 205 - 222.
- Norman, A. M. & Stebbing T. R. R. (1886) On the Crustacea Isopoda of the ' Lightning', ' Porcupine', and ' Valorous' Expeditions. Transactions of the Zoological Society of London, 12, 77 - 141.
- Kudinova-Pasternak, R. K. (1981) Tanaidacea. In: Kusnjezov, A. P. & Mironov, A. N. (Eds.) Benthos of the submarine mountain Markus Necker and adjacent Pacific regions. Shirshov Institute of Oceanology, Moscow. Academy of Science, pp 94 - 112
- Kudinova-Pasternak, R. K. (1965) Deep-sea Tanaidacea from the Bougainville Trench of the Pacific. Crustaceana, 8 (1), 75 - 91.
- Kudinova-Pasternak, R. K. (1976) Additional notes on the fauna of Tanaidacea (Crustacea, Malacostraca) of the deep water trenches. Trudy Instituta Okeanologii, 99, 115 - 125.
- Kudinova-Pasternak, R. K. (1977 *) (published in 1978). Tanaidacea (Crustacea, Malacostraca) from the deep-sea trenches of the western part of the Pacific. Trudy Instituta Okeanologii. Akademiya Nauk SSSR, 108, 115 - 135.
- Kudinova-Pasternak, R. K. (1970) Tanaidacea of the Kurile-Kamchatka Trench. Trudy Instituta Okeanologii. Akademiya Nauk SSSR, 86, 341 - 380.
- Hansen, H. J. (1913) Crustacea, Malacostraca, II. Danish Ingolf Expedition, 3 (3), 1 - 127.
- Kudinova-Pasternak, R. K. (1975 a) Tanaidacea (Crustacea, Malacostraca) of the deep-sea Romansh and Guinea Hollow Trenches. Zoologicheskii Zhurnal, 54 (5), 682 - 687.
- Shiino, S. M. (1978) Tanaidacea collected by French scientist on board the survey ship Marion Dufresne in the regions around the Kerguelen Islands and other subantarctic islands in 1972, i 74, i 75, i 76. Scientific Reports of the Shima Marineland, 5, 1 - 122.
- Lang, K. (1958) Leptognathia paramanca n. sp. Arkiv for Zoologi, 2, 431 - 434.
- Sars, G. O. (1896) Isopoda. Parts I & II. Apseudidae, Tanaidae. An Account of the Crustacea of Norway with short descriptions and figures of all the species, II, 1 - 40.
- Kudinova-Pasternak, R. K. (1982) Deep-sea Tanaidacea (Crustacea, Malacostraca) from the Mediterranean Sea. Trudy Instituta Okeanologii. Akademiya Nauk SSSR, 117, 151 - 162.
- Dollfus, A. (1897) Note preliminaire sur les Tanaidae recueillis aux Acores pendant les campagnes de l´Hirondelle (1887 - 1888). Bulletin du Societe Zoologique France, 21, 207 - 215.
- Vanhoffen, E. (1914) Die Isopoden der deutschen Sudpolar Expedition 1901 - 1903. Deutsche Sudpolar-Expedition, 15, Zoologie, 7, 447 - 598.
- Gutu, M. (1972) Phylogenetic and systematic considerations upon the Monokononophora (Crustacea- Tanaidacea) with the suggestions of a new family and several new subfamilies. Revue Roumaine de Biologie (Serie de Zoologie), 17, 297 - 305.