Capeorchestia capensis ( Dana, 1853 )

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 : 163-164

Capeorchestia capensis ( Dana, 1853)

( Figs 9–12 )

Talorchestia capensis . ― K.H. Barnard, 1916: 216. ― K.H. Barnard, 1940: 470, fig. 21. ― Griffiths, 1974b: 330. ― Griffiths, 1975: 171. ― Hesp & McLachlan, 2000: 156 (ecology).

Types. Neotype, male, 10 mm, AM P.88482, Pringle Bay , Western Cape, South Africa (34° 20'30"S 18°49'24"E), under kelp, dissipative beach, S. Baldanzi, November 2011.

Additional material examined. 2 females, Kleinmond (western cape), South Africa (~ 34°20.474’S 19°2.314’E), underneath kelp dissipative beach, Simone Baldanzi, winter 2010, KLEI L2 Bw ; 8 females, Knysna (western cape), South Africa (~ 34°4.317’S 23°0.755’E), underneath kelp dissipative beach, Simone Baldanzi, winter 2010, Kn L 1 Cw ; 1 female, Pringle Bay , Western Cape, South Africa (~ 34°20.5'S 18°49.4'E), underneath kelp dissipative beach, Simone Baldanzi, winter 2010, PRING L1 Cw;

1 male (immature), AM P.88472, 1 female (ovigerous) AM P.97674, Port Nolloth , Northern Cape, South Africa (29°15'S 16°52'E), underneath kelp and macroalgae on dissipative beach, S. Baldanzi, November 2010 ; 1 male, AM P.99076, 3 males, 6 females, AM P.98284, Port Nolloth , Northern Cape, South Africa (29°15'S 16°52'E), underneath kelp and macroalgae on dissipative beach, S. Baldanzi, November 2010 ; 5 males, Franskraal (Western Cape) (one larger than others), winter 2010, FS L2C . 3 specimens, AM P.88475 Yzerfontein , Western Cape, South Africa (33°21'26"S 18°09'15"E), under kelp, dissipative beach, S. Baldanzi, December 2010 ; 10+ specimens, AM P.88476, Hondeklibaai , Northern Cape, South Africa (30°18'52"S 17°16'30"E), S. Baldanzi, 2010 ; 21 specimens, AM P.88477, Pringle Bay , Western Cape, South Africa (34°20'30"S 18°49'24"E), S. Baldanzi, November 2011 ; 8 specimens, AM P.88474, Knysna , Western Cape, South Africa (34°04'19"S 23°00'45"E), under macroalgae, dissipative beach, S. Baldanzi, February, 2011 ; 2 specimens, AM P.88471, Kleinmond , Western Cape, South Africa (34°20'28"S 19°2'19"E), under kelp, dissipative beach, S. Baldanzi, November 2011 ; 5 males, AM P.88470 [possibly take gnathopods of smallest male for SEM], 2 females, AM P.88483, Franskraal , Western Cape, South Africa (34°36'15"S 19°24'12"E), under kelp, dissipative beach, S. Baldanzi, February, 2011.

Type locality. Pringle Bay , Western Cape, South Africa (34° 20'30"S 18°49'24"E) underneath kelp, dissipative beach.

Description. Based on neotype, male, 10 mm, AM P.88482.

Head with seven groups of short, slender scales along ventroproximal surface (short scales). Eyes present. Antenna 1 short, not longer than peduncular article 4 of antenna 2. Antenna 2 less than half body length; peduncular articles slender, without marginal row of robust setae, with sparse, small robust setae; article 5 longer than article 4; flagellar articles final article minute, not cone-shaped, virgula divina absent, flagellar articles without apical cluster of serrate setae. Labrum upper lip with apical setal patch; epistome with a few robust setae (in one distal row), with many pores. Labium distolateral setal tuft absent; distomedial setal tuft present. Mandible left lacinia mobilis 4- cuspidate. Maxilla 1 with small palp, 2-articulate. Maxilliped palp article 2 distomedial lobe well developed; article 4 fused with article 3.

Pereon. Gnathopod 1 sexually dimorphic; parachelate; coxa smaller than coxa 2; posterior margin of propodus with lobe covered in palmate setae, palmate lobes in male only; carpus longer than propodus, 1.8 × as long as propodus, 2.5 × as long as broad; propodus subrectangular, anterior margin with 5 groups of about 15 short robust setae, propodus 1.5 × as long as broad, palm transverse, with 18 short robust setae in two patches, without spine patch on posterodistal corner; dactylus longer than palm, simplidactylate, without anterodistal denticular patch. Gnathopod 2 sexually dimorphic; subchelate; posterior margin of merus, carpus and propodus each without lobe covered in palmate setae; basis slightly expanded; ischium without lobe on anterior margin, with distally rounded anterodistal lobe on medial surface; carpus triangular, reduced (enclosed by merus and propodus), posterior lobe absent, not projecting between merus and propodus; propodus 1.3 × as long as wide, palm extremely acute, reaching between 44% along posterior margin, smooth, with rounded protuberance near dactylar hinge, not lined with robust setae, deeply excavate, posterodistal corner defined by large thumb, posteromedial surface without groove, without cuticular patch at corner of palm; dactylus subequal in length to palm, sinusoidal, without anteroproximal bump, posterior margin smooth, with shallow posterodistal sinus. Pereopods 2–4 coxae deeper than wide. Pereopods 3–7 cuspidactylate, dactyli without anterodistal patch of many rows of tiny setae. Pereopod 4 dactylus thickened proximally with a notch midway along posterior margin (granular surface). Pereopod 5 propodus slightly shorter than carpus; dactylus without anterodistal setal patch (small tripod spines lateral to cuspidactylate spines). Pereopods 6–7 not sexually dimorphic; merus, carpus, propodus with many strong robust setae. Pereopod 6 posterior lobe with about 40 marginal slender setae. Pereopod 7 basis lateral sulcus present, slightly pronounced, posterior margin with numerous small robust setae, posterodistal lobe produced downwards almost to merus, shallow, broadly rounded; merus posterior margin expanded distally, subtriangular; propodus setation without large distal tuft of setae.

Pleon. Pleopods all well developed. Pleopods 1–3 biramous. Epimeron 2 longer than epimeron 3, posterior margin minutely serrate. Epimeron 3 posterior margin minutely serrate, with about 9 setae, posteroventral corner rounded. Uropod 1 peduncle 14 slender setae, tiny distolateral robust seta with simple tip; inner ramus spatulate, subequal in length to outer ramus, with 5 lateral and 6 medial marginal robust setae in 2 rows; outer ramus with 4 marginal robust setae in one row. Uropod 2 peduncle with 4 robust setae; inner ramus subequal in length to outer ramus, with 4 lateral and 4 medial marginal robust setae in 2 rows; outer ramus with 5 marginal robust setae in 1 row. Uropod 3 peduncle with 7–8 robust setae; ramus partially fused to peduncle, ramus longer than or subequal in length to peduncle, ramus 2 to 3 × as long as broad, linear (narrowing) or spatula-like, with 10 marginal setae, with than 6+ apical setae. Telson broader than long, rounded distally, apically incised, dorsal midline entire, with marginal and apical robust setae, at least 12–16 robust setae per lobe.

Female (sexually dimorphic characters). Gnathopod 1 simple; posterior margin of merus, carpus and propodus each without lobe covered in palmate setae; carpus 1.9 × as long as propodus, 2.4 × as long as broad; propodus subrectangular, tapering slightly distally, anterior margin with 4 groups of 15 robust setae, propodus 2 × as long as broad. Gnathopod 2 chelate; basis expanded anteroproximally; without anterodistal lobe on medial surface; carpus well developed (not enclosed by merus and propodus), posterior lobe present, projecting between merus and propodus; propodus palm obtuse, nearly straight, lined with serrate setae; dactylus slightly shorter than palm, curved.

Distribution. South Africa. Lamberts Bay ( K.H. Barnard 1916), Kommetje ( K.H. Barnard 1916), Cape of Good Hope ( K.H. Barnard 1916); Keurbooms River, Plettenberg Bay ( K.H. Barnard 1940); Knysna ( Griffiths 1974b); Port Beaufort and Moddergat, Breede River Estuary ( Griffiths 1974b); Port St Johns, Umzimvubu River mouth ( Griffiths 1974b).

Figures

FIGURE 9. Capeorchestia capensis (Dana, 1853), male “ b ”, 10 mm, AM P. 99076, Port Nolloth, Northern Cape, South Africa. Scale lines represent 0.2 mm.

FIGURE 11. Capeorchestia capensis (Dana, 1853), male “ b ”, 10 mm AM P. 99076, Port Nolloth, Northern Cape, South Africa; male “ a ”, AM P. 99077, same data as male “ b ”. Scale lines for male “ a ” represent 0.5 mm, remainder represent 1.0 mm.

FIGURE 12. Capeorchestia capensis (Dana, 1853), male “ b ”, 10 mm, AM P. 99076, Port Nolloth, Northern Cape, South Africa. Scale lines represent 1.0 mm.