Acanthonotozoma Serratum , an Arctic Amphipod New to Britain

• Published in: Journal of the Marine Biological Association of the United Kingdom
• Main Author: Moore, P. G.
• Format: Article in Journal/Newspaper
• Language: English
• Published: Cambridge University Press (CUP) 1984
• Subjects: Aquatic Science; Arctic; Kara Sea; Greenland; Norway; Abbs; Arctic amphipod; greenlandic; Iceland; Spitzbergen
• Online Access: http://dx.doi.org/10.1017/s0025315400030459; https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0025315400030459

The amphipod family Acanthonotozomatidae was represented hitherto in British waters by the genera Iphimedia Rathke (including Panoploea Thompson) and Odius Lilljeborg; Acanthonotozoma Boeck being unrecorded (Lincoln, 1979). Material referable to Acanthonotozoma serratum (O. Fabricuius, 1780) is here reported from the East coast of Scotland. Two specimens (1 juvenile, ca. 7 mm long and 1 immature female, broken in half, estimated length 85 mm) were taken by Dr R. Earll by diving (his sample no. CR2, St. 4/3) from amongst tubes occupied by the amphipod Ericthonius rubricornis Stimpson attached to boulders amongst coarse sand, depth 345 m, at Coldingham Bay, St Abbs, Berwickshire, Scotland (55° 53' 30": 2° 5' 36") on 17 August 1982. Dr Earll kindly made over his amphipod material to me for identification. Just (1978) has reviewed the genus Acanthonotozoma and has commented on the variability of both morphology and coloration of A. serratum from Greenland, Iceland, Spitzbergen, Russian Kara Sea, N. Norway and the Skagerrak. The Scottish material has Norwegian rather than Greenlandic characteristics. Thus the dorsal tooth on peraeonite 5 is lacking, giving the dorsum a 4-dentate appearance. Coxal plate 3 is bluntly tapered distally. Coxal plate 4 is squarish and coxal plate 7 has the posterodistal corner unproduced. The posterodistal projections of the third epimeral plate are short with a wide angle between them. The basal articles of peraeopods 57­ have a square, less sharply produced posterodistal corner. Mouthparts and anterior peraeopoda have been dissected from the right side of the female and mounted on three slides in polyvinyl-lactophenol. No significant differences are apparent in mouthpart morphology compared with fig. 4 in Just (1978).