Africorchestia quadrispinosa ( K.H. Barnard, 1916 )

Lowry, J. K. & Baldanzi, S., 2016, New talitrids from South Africa (Amphipoda, Senticaudata, Talitroidea, Talitridae) with notes on their ecology, Zootaxa 4144 (2), pp. 151-174 : 158

Africorchestia quadrispinosa ( K.H. Barnard, 1916)

( Figs 5–8 )

Orchestia Fischerii. ― Guérin, 1832: pl. 26, fig. 3, and 1843. Explication des Planches, p. 22. (non H. Edwards, 1830 and 1840.)

Orchestoidea Fischerii. ― Stebbing, 1910: 459 (in part).

Talorchestia quadrispinosa K.H. Barnard, 1916: 217 , pl. 27, figs 29–32. ― K.H. Barnard, 1940: 470, fig. 29. ― Schellenberg, 1925: 159. ― Penrith & Kensley, 1970: 205, 231, table 1 (ecology). ― Griffiths, 1974a: 204. ― Griffiths, 1975: 171. ― Coleman & Leistikow, 2001: 4, figs 7–11.

Africorchestia quadrispinosa . ― Lowry & Coleman, 2011: 58 , fig. 2. ― Milne & Griffiths, 2013: 77, 87 (Appendix). ― Cramb, 2015: 62, Table 3.2, 68, 150, 151, 174, 175, 178–184, 186 192, 193.

Types. Syntypes, males and females, SAM 1256, SAM 1283, SAM A2514, SAM A2875.

Type locality. Dassen Island (~ 33°25’S 18°05’E) and east and west coast of Cape Peninsula (~ 34°10’S 18°20’E) , South Africa.

Material examined. 2 males, AM P.98279, Lüderitz, Namibia (~ 26°38’45”S 15°9’14”E), S. Baldanzi, 2010– 2011 . 7 males, 8 females, AM P.98280, Pringle Bay , South Africa (~ 34°21’S 18°49’E), S. Baldanzi, 2010–2011 . 1 male, 12.1 MM, AM P.99074, 3 males, 4 females, AM P.98281, Struisbaai Bay , South Africa (~ 34°48’16”S 20°03’27”E), S. Baldanzi, 2010–2011 .

Diagnosis. Based on male. Gnathopod 2 propodus ovate, palm extremely acute, convex, extending about 75% of posterior margin, with rounded protuberance near dactylar hinge, with large distal sinus, with two rows of robust setae along entire margin, posteroproximal corner without spine; dactylus slightly longer than palm. Pereopods 6– 7 much longer than pereopods 3–5. Pereopod 6 much longer than pereopod 7; basis expanded posteriorly. Pleonites 1–2 each with pair of posterodistal spines. Pleonite 3 with paired vestigial posterodistal spines. Uropod 3 ramus longer than peduncle, 3.8 x as long as broad. Telson entire apically truncated with about 10 apical robust setae on each side.

Distribution. Namibia. Walvis Bay, ~ 25°55’S 14°32’E ( Schellenberg 1925); Lüderitz Bay, ~ 26°39’S 15°09’E ( Schellenberg 1925; Penrith & Kensley 1970); Shearwater Bay ( Griffiths 1974a); Skeleton Coast, 21°38’38”S 13°55’17”E and 26°44’09”S 15°05’40”E ( Coleman & Leistikow 2001); Orange River mouth, ~ 28°37’56.23”S 16°27’16.88”E ( Griffiths 1974a). South Africa. Cape Peninsula, ( K.H. Barnard 1916); Dassen Island; Pringle Bay, Struisbaai Bay (this study).

Figures

FIGURE 5. Africorchestia quadrispinosa (K. H. Barnard, 1916), male, 12.1 mm, AM P. 99074, Struisbaai, South Africa. Scale line for A 2 represents 0.5 mm, remainder represent 0.1 mm.

FIGURE 6. Africorchestia quadrispinosa (K. H. Barnard, 1916), male, 12.1 mm, AM P. 99074, Struisbaai, South Africa; female, AM P. 99075, Struisbaai, South Africa. Scale line for body represents 1 mm, H represents 0.5 mm, CT represents 0.01 mm, remainder represent 0.2 mm.

FIGURE 7. Africorchestia quadrispinosa (K. H. Barnard, 1916), male, 12.1 mm, AM P. 99074, Struisbaai, South Africa. Scale lines represent 1 mm.

FIGURE 8. Africorchestia quadrispinosa (K. H. Barnard, 1916), male, 12.1 mm, AM P. 99074, Struisbaai, South Africa. Scale lines represent 0.5 mm.