Sieg, J. (1986). Tanaidacea (Crustacea) von der Antarktis und Subantarktis. II. Tanaidacea gesammelt von Dr. J.W. Wägele während der Deutschen Antarktis Expedition 1983. Mitteilungen aus der Zoologischen Museum der Universität Kiel. 2 (4): 1-80.
138942
Sieg, J.
1986
Tanaidacea (Crustacea) von der Antarktis und Subantarktis. II. Tanaidacea gesammelt von Dr. J.W. Wägele während der Deutschen Antarktis Expedition 1983
Mitteilungen aus der Zoologischen Museum der Universität Kiel
2 (4): 1-80
Publication
Tanaidacea were collected at 13 stations by the German Antarctic Expedition in 1983. Two of these stations are in the Bransfield Street area at the northwestern tlp of t h e Antarctic Peninsula. The remaining stations all are situated on the east coast of the Weddell Sea.
Altogether 258 specimens representing 27 species in 23 genera, all belonging to the superfamily Paratanaoidea, were collected. Eight species and three genera are described as new t o science. Formerly two of these new species (Leptognathia breviremoides spec. nov. and Paranarthrura fortispina spec. nov.) had been recorded from the Antarctic but their taxonomic status had been misunderstood. Lepotcheliidae is represented by a single species, Pseudonototanais bransfieldensis spec. nov. The distinction b e twe e n Pseudonototanais and Pseudoleptochelia discussed and a key to the species of Pseudonototanais is presented. Nototanais antarcticus and N. dimorphus are the only collected members of the Nototanaidae. Since there had been previous problems in the identification of these two species, the distinctive features of these species are discussed. Three species of the Pseudotanaidae were collected: Cryptocopoides arctica, Pseudotanais abyssi and P. nordenskioldi. The majority of species belong t o the "Leptognathiidae". Based on this study a better understanding of the evolution of the whole superfamily Paratanaoidea was possible. Typhlotanainae is elevated t o family status while Agathotanaidae and Anarthruridae are combined and represent only one subfalily, the Anarthrurinae LANG. The Anarthrurinae is herein considered as t h e sister group to the Akanthophoreinae subfam. nov. Finally Leptognathiinae is redefined and much more limited. A list showing :he assignment of all known genera t o these three subfamilies is also included. Combining those subfamilies in a single family, Leptognathiidae SIEG, 1973 becomesa junior synonym of Anarthruridae LANG, 1973.
Re-examination of the type-species Tanais breviremis LILLJEBORG, 1864 led t o a very restricted definition ofthe genus Leptognathia G. 0. SARS. One group of species,
the so called L. gracilis complex, has been transferred to Akanthophoreus gen. nov. The remaining species areall listed as tentatively belonging t o the genus Leptognathia.
Only re-examination accompanied by a redescription can reveal the correct taxonomic position in each of these species. Moreover it has been shown that all specimens formerly recorded as "Leptognathia breviremis" from Antarctic waters actually belong to a very closely related species, L. breviremoides spec. nov. Besides these two Leptognathia-species t h e following species belonging to the Leptognathiinae are represented in the material: Exspina typica, Mirandotanais vorax, Pseudoleptognathia setosa, Pseudoparatanais brachycephalus spec. nov., and Tanaopsis antarcticus, Akanthophoreinae subfam. nov. now contains all species possessing spines on the merus or carpus in the P.1. Akanthophoreus gen. nov. is established as the type-genus with Tanais gracilis KROYER, 1842 as t h e type-species. A rnonographic revision of this new genus is presented. The distribution of Akanthophoreus gracilis (KRQYER, 1842) appears to be limited to t h e northern hemisphere. All records from the Antarctic/Subantarctic probably belong to a different species, A. australis (BEDDARD, 1886). The genus is represented by two additional species each in the northern als well as in the southern hemisphere. For t h e North Atlantic A. longiremis (LILLJEBORC, 1864) and A. multiserratus (HANSEN, 1913) are recorded while there are A. antarcticus (VANHÖFFEN, 1914) and A. weddellensis spec. nov. in Antarctic waters.
A key to the species is presented and diagnostic characters are sguered . Of the other members collected Paraleptognathia(with P. antarctica spec. nov.) is recorded for the first time from the Antarctic region while Arhaphuroides parabreviremis, Libanius monacanthus, and Tanaella unisetosa have been previously recorded from this area. Finally Mimicarhaphura immanis gen. nov. et spec. nov. is described. This species is characterized by uniquely shaped uropods.
Within the Anarthrurinae there are now two tribes - Agathotanaini and Anarthrurini - each originally established on the familial level. A key to all known genera is also provided. In the present material Paranarthrura is represented by two species, P. fortispina spec. nov. and P. meridionalis spec. nov. A revised diagnosis of t h e genus is given accompanied by a key t o all known species. Furthermore the specimens formerly recorded from the Antarctic/Subantarctic as P. insignis HANSEN, 1913 are transferred to P. fortispina spec. nov.
Finally the family Typhlotanaidae is represented by five species. Typhlotanais rnacrocephala HANSEN, 1913 is rermoved from Typhlotanais, redescribed, and established as the type-spccies for Meromonacantha gen. nov. Two other species - Paratyphlotanais armatus and Typhlotanais greenwichensis - are the most dominant species in the present collection. Peraeospinosus pushkini and Typhlotanoides rostralis are only rarely found in the collection.
