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Description:
Size: up to 25mm
Colour: whitish/yellowish/pinkish
Head deeper than long; lateral cephalic lobe narrow, subacute; eyes oval, bright red
Antenna1 short, peduncle article 1 short, not produced anterodistally, accessory flagellum 5-segmented; antenna 2 length 1.5 x antenna 1
Coxa 1 large, anterior margin concave, anteroventral corner produced; coxa 4 with weak posteroventral lobe; epimeral plate 3 with tiny tooth on posterodistal corner; first segment of urosome slightly depressed dorsally; urosomite 3 with small dorsal robust setae, proximal to telson
Gnathopod 1 subchelate, propodus subrectangular, length 1.6 x breadth, clearly longer than carpus; gnathopod 2 minutely subchelate with weakly developed palm; uropod 2 inner ramus strongly constricted; uropod 3 peduncle short, rami lanceolate, subequal in length
Telson as long as broad, emarginated
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References:
Boudrias, MA., Carey, AG. Jr. 1988. Life history patterns of Pseudalibrotus litoralis (Crustacea: Amphipoda) on the inner continental shelf, SW Beaufort Sea . Mar Ecol Prog Ser 49 , pp. 249-257.
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Gurjanova, E. F. 1951. Bokoplavy morjej SSSR I sopredel'nykh vod (Amphipoda - Gammaridea). Akad. Nauk SSSR, Opredel. Faune SSSR 41 , pp. 184-186.
Holmquist, C. 1965. The amphipod genus Pseudalibrotus . Zeitschrift für Zoologische Systematik und Evolutionsforschung 3, pp. 19-46.
Legeżyńska , J. 2000. Distribution patterns and feeding strategies of lysianassoid amphipods in shallow waters of an Arctic fjord. Pol. Polar Res 22 (3-4), 173-186.
Legeżyńska , J., Węsławski, JM., Presler, P. 2000. Benthic scavengers collected by baited traps in the high Arctic . Polar Biology 23 , pp. 539-544.
Lowry, J. K., Stoddart, H. E. 1993. The Onisimus problem (Amphipoda, Lysianassoidea, Uristidae). Zoologica Scripta 22 (2) , pp. 167-181.
Nygard, H., Wallenschus, J., Camus, J., Varpe, O., Berge, J. 2010. Annual routines and life history of the amphipod Onisimus litoralis : seasonal growth, body composition and energy budget. Mar Ecol Prog Ser 417, pp. 115-126.
Sainte-Marie, B. 1984. Morphological adaptations for carrion feeding in four species of littoral and circalittoral lysianassid amphipods. Can J Zool 62(9) , pp. 1668-1674.
Sainte-Marie, B. 1986 . Feeding and swimming of lysianassid amphipods in a shallow cold-water bay. Mar Biol 91 , pp. 219-229.
Sainte-Marie, B., Percy, JA., Shea, JR. 1989. A comparison of meal size and feeding rate of the lysianassid amphipods Anonyx nugax , Onisimus (= Pseudalibrotus ) litoralis and Orchomenella pinguis . Mar Biol 102 , pp. 361-368.
Sainte-Marie, B., Lamarche, G., Gagnon, JM. 1990. Reproductive bionomics of some shallow-water lysianssoids in the Saint Lawrence Estuary, with a review on the fecundity of the Lysianassoidea (Crustacea: Amphipoda). Can J Zool 68, pp. 1639-1644.
Sars, G. O. 1890-1895. An account of the Crustacea of Norway with short descriptions and figures of all the species. vol. I: Amphipoda, Cammermeyers, pp. 102-104, pl. 35.
Shea, JR., Percy, JA. 1990. Salinity tolerance and osmoregulation of the arctic marine amphipods Onisimus litoralis (Kroyer) and Anonyx nugax (Phipps). Polar Biol 10, pp. 275-281.
Stephensen, K. 1923. Crustacea Malacostraca. V (Amphipoda I). Dan. Ingolf Exped. 3 (8) , pp. 56-58.
Stephensen, K. 1935. The Amphipoda of N. Norway and Spitsbergen with adjacent waters. Tromso Mus. Skr. 3(1) , pp. 45-46.
Stephensen, K. 1944. The zoology of East Greenland . Amphipoda. Medd. om Gronland. 121 (14) , p. 19-21.
Szaniawska, A., Wołowicz, M. 1986. Changes in the energy content of common species from Hornsund, Southwest Spitsbergen . Polar Res 4 , pp. 85-90.
Węsławski, J. M. 1990. Distribution and ecology of South Spitsbergen coastal marine Amphipoda (Crustacea). Pol. Arch. Hydrobiol. 37 (4) , pp. 503-519.
Węsławski, JM., Opaliński, K., Legeżyńska, J. 2000. Life cycle and production of Onisimus litoralis (Crustacea: Amphipoda): The key species In the Arctic soft sediment littoral. Pol. Arch. Hydrobiol 47 , pp. 585-596.
Węsławski, JM ., Legeżyńska , J. 2002. Life cycles of some Arctic amphipods, Pol. Polar Res. 23 (3-4), pp. 253-264.
http://www.arcodiv.org/seaice/amphipods/Onisimus_litoralis.html (04.07.2011, 12:37) |
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