Apocorophium acutum ( Chevreux, 1908 )

Hossain, M. Belal & Hughes, L. E., 2016, New species Victoriopisa bruneiensis and Apocorophium acutum (Chevreux, 1908) from Brunei (Crustacea: Peracarida: Amphipoda), Zootaxa 4117 (3), pp. 375-386 : 376-381

Apocorophium acutum ( Chevreux, 1908)

Figs 2–5 .

Corophium acutum Chevreux, 1908: 75 , fig. 6.— Chevreux & Fage, 1925: 366, figs. 359, 374.— Schellenberg, 1928: 672, 673.— Shoemaker, 1934: 26, 27.— Crawford, 1937: 624, 625.— Salfi 1939: 31, fig. 4–7.— Lincoln, 1979: 534, fig. 256a– d.— Hurley, 1954: 439 –442, fig. 3 (26–34).— Myers?1982: 188, fig. 126.— Barnard & Karaman, 1991a: 185.— Ren, 2006: 296 –297, fig.117.

Apocorophium acutum .— Bousfield & Hoover, 1997: 123 –125, fig. 35.— Lowry & Stoddart, 2003: 89 (catalogue).— Bano & Kazmi, 2012: 113 (checklist).— Jung & Kim, 2007: 247 –250, fig. 1.

Corophium ascherusicum .— K.H. Barnard, 1916: 272 (in part).

Material examined. 1 male, 2.1 mm, dissected in part (A1–2; G1–2), 1 slide, SEM pin mount whole animal, AM P.97897; 1 female, 3.6 mm, dissected, 3 slides, AM P.97899; female 1 SEM pin mount, AM P.97898; paratypes 20 specimens (6 male and 14 female), AM P.97900, Sungai Brunei Estuary, Brunei River, Brunei, South China Sea (48°45′– 58°02′N 114°858′–115°810′E), 0.5–1.5 m, from intertidal hard substratum, attached to green algal mat, June 2012, coll. M. Belal Hossain.

Type locality. Annaba, Algeria.

Remarks. Apocorophium acutum is reported from a wide range of localities. The synonymy here comprehensively includes all taxonomic citations of the species. Illustrations by Bousfield & Hoover, 1997 in their review do not have the distal projection on antennae 2 which is present in all other illustrated reports of Apocorophium acutum .

Distribution. South China Sea: Brunei (current study; Ren 2006). Algeria ( Chevreux 1908). British Isles ( Crawford 1937; Lincoln 1979). Mediterranean ( Chevreux & Fage 1925; Myers 1982). Suez Canal ( Schellenberg 1928). South Africa ( Crawford 1937). New Zealand ( Crawford 1937; Hurley 1954). Australia ( Lowry & Stoddart 2003). Korea ( Jung & Kim 2007). Pakistan ( Bano & Kazmi 2012), Northeast Pacific ( Crawford 1937, Bousfield & Hoover 1997). Northwest Atlantic ( Shoemaker 1934). Southwest Atlantic ( Shoemaker 1934).

Figures

FIGURE 2. Apocorophium acutum (Chevreux, 1908) SEM image, male habitus 2.1 mm, AM P. 97897; ‘ * ’ female habitus 3.6 mm, AM P. 97899, Sungai Brunei Estuary, Brunei River, Brunei, South China Sea, scales H l— 100 µm; A 2 m * — 100 µm and A 2 m— 100 µm.

FIGURE 3. Apocorophium acutum (Chevreux, 1908) SEM image, female habitus 3.6 mm, AM P. 97898, Sungai Brunei Estuary, Brunei River, Brunei, South China Sea, scales A 1 — 20 µm; Ur l— 100 µm; H d— 100 µm; Ur l - 20 µm; A 1 d— 100 µm.

FIGURE 4. Apocorophium acutum (Chevreux, 1908) SEM image, female habitus 3.6 mm, AM P. 97898, Sungai Brunei Estuary, Brunei River, Brunei, South China Sea, scales Ur l— 100 µm; Ur d— 100 µm; Ur v— 100 µm; Ur d— 20 µm; Ur d— 100 µm.

FIGURE 5. Apocorophium acutum (Chevreux, 1908) male habitus 2.1 mm, AM P. 97897, Sungai Brunei Estuary, Brunei River, Brunei, South China Sea, scales 0.1 mm.