Pecten sulcicostatus G. B. Sowerby II, 1842
SOWERBY II, G. B. 1842. Monograph of the genus Pecten. In G. B. Sowerby II (Ed.): Thesaurus conchyliorum, or monographs of genera of shells, 1 (2): 45-78, pls. 12-20. Sowerby. London. [p. 47, pl. 13, figs. 35, 36]
1842 Pecten sulcicostatus G. B. Sowerby II, 1842
1892 Pecten (Vola) capensis [Gray] Sowerby III [nomen nudum]
1892 Pecten (Vola) capensis [Gray] Sowerby III [nomen nudum]
G. B. Sowerby II, 1842, plate 13.
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«T. rotundatâ, radiatim sulcatâ, sub-ventricosâ; auriculis latis, excavatis, striatis; costis 12, in valvâ sinistrâ elevatis, sub-quadratis, sulcatis; in valvâ dextrâ rotundatis, striatis, interstitiis in valvâ sinistrâ mediocris, sulcatis, in valvâ dextrâ sub-nullis; colore valvae sinistree pallidè fulvo, rubro-fulgurato, valvae dextrae purpureo. Long. 1.65.; lat. 0.50.; alt. 1.50; poll.
Rounded, radiately sulcated, rather ventricose; the auricles wide, concave, striated; the ribs 12 in number, in the left valve elevated, rather square, sulcated, in the right valve rounded and striated, with scarcely any interstices. The interstices in the left valve are as wide as the ribs, and sulcated. The colour of the left valve is pale fawn, with angulated streaks of red, in the right valve it is purple. From Mr. Norris's Collection.» GEORGE BRETTINGHAM SOWERBY II, 1842
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«HISTORY IN NEW ZEALAND: The history of Pecten in New Zealand apparently began with its arrival as planktonic larvae from the North Atlantic-Mediterranean area, via South Africa and the Antarctic Circumpolar Current, following the same route as the more numerous tonnoidean gastropod migrants such as Semicassis labiata (Perry, 1811) and Argobuccinum pustulosum (Lightfoot, 1786) (Beu 1976), of Lutraria (Lutraria) (see below), of mytilids such as Mytilus galloprovinialis (Lamarck, 1819) and Modiolula phaseolina (Philippi, 1844) (Daguin & Borsa 2000; Beu & Darragh 2001; Beu 2004; Saavedra & Peña 2004), and of Lutraria (Lutraria) grandis (see below). The two Pecten species, P. sulcicostatus G. B. Sowerby II, 1842 and P. afribenedictus Kilburn & Dijkstra, 1995, living in southern Africa as a result of this dispersal, were discussed by Kilburn & Dijsktra (1995) and Dijkstra & Kilburn (2001, p. 286), although the wide range of variation now recognised in Pecten species suggests that these may not be distinct.»
BEU, A. G. 2006. Marine Mollusca of oxigen isotope stages of the last 2 million years in New Zealand. Par 2. Biostrattigraphically usefull and new Pliocene to Recent bivalves. Journal of the Royal Society of New Zealand, 36 (4): 151-338, figs. 1-41. [p. 199]
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«Description: Shell height to ca. 100 mm (most adults 60–80 mm), solid, suborbicular, strongly inequivalve, LV flat, RV convex, equilateral, auricles equal, umbonal angle ca. 90–100°. Both valves sculptured with 12–15 radial costae, on LV high and rounded with secondary radial riblets, interstices wider than primary ribs with closely spaced commarginal lamellae, on RV primary ribs subangular also with secondary radial riblets, interstices narrower than primary ribs, with secondary radial riblets and microscopic interstitial commarginal lamellae. Auricles with 4–9 weak radial riblets and fine, closely arranged commarginal lamellae. Hinge line straight. Auricular and disc gape narrow. Byssal fasciole small, byssal notch shallow, no ctenolium. Inner surface with angular ribs near ventral margin and auricular denticles near anterior and posterior margins. Cardinal crura with intermediate teeth. Resilifer elongate-triangular. Colour off-white with pink, salmon or brown markings, RV paler than LV.
Type material: Sowerby (1842: 47) mentioned that the described specimen was in ‘Mr. Norris’s Collection’ (= Thomas Norris of Preston), which was auctioned in 1873 by J. C. Stevens (Dance 1986: 166, 169, 232). The holotype is now untraceable. Regional data (all NMSA): SOUTH AFRICA: False Bay: off Buffels Bay, 47 m, slightly muddy sand, live (S8434); off Miller’s Point, 34 m, sand, dead (S7724); between Seal Is. and Simonstown, 30 m, fine sand, dead (S8080); off Partridge Point, 45 m, muddy sand, live (S3730); N of Simonstown, 28 m, sand, shell, dead (S3533); False Bay, 42 m, live (A1919); 2 km NE of Miller’s Point, 34 m, sand, live (S9266). Agulhas Bank: SW of Stilbaai, 60 m, dead (B2465); SE of Mossel Bay, 73 m, live (E5254); off Mossel Bay, 73 m, live (A920); off Bird Is., Algoa Bay, 73–110 m, live (4498); St. Francis Bay, 70 m, fine muddy sand, worm tubes and pennatulids, live (B1622); off East London, 70 m, fine sand, broken shell, dead (B8413); same loc., 70 m, muddy sand, dead (B8332). W Cape Littoral: Struis Bay, Cape Agulhas, beachdrift (E6458); Die Mond, Cape Agulhas, beachdrift (E6615). E Cape Littoral: Jeffreys Bay, beachdrift (B646); Port Elizabeth, beachdrift (2431); Port Elizabeth, beachdrift (4495); Philip’s Reef, Port Elizabeth, 11 m, dead (E7232–3). Distribution: Endemic to inner continental shelf of South Africa, relatively limited distribution from False Bay to East London. Habitat: Mainly sublittoral depths, in 30–70 m, free-living on sandy or muddy sand. Shallower water individuals are smaller and often more brightly patterned than those from the continental shelf. Remarks: Sowerby (1892) used the manuscript name Pecten (Vola) capensis Gray MS, for this species, without any description, but on p. 89 corrected the name to P. sulcicostatus. Fleming (1957), followed by Kilburn & Rippey (1982), treated P. sulcicostatus as a subspecies of Pecten maximus (Linnaeus, 1758) from the eastern Atlantic. The present species ‘probable arose from a Pliocene or Pleistocene relation of maximus which it closely resembles’ (Fleming, 1957: 23). Waller (1991: 18, 37) also considered P. sulcicostatus to be morphologically close to P. maximus, but treated it as a full species. No intermediate populations are known from western Africa. De Villiers (1976) conducted exploratory surveys in False Bay and off Mossel Bay, with a view to establishing whether a local scallop-fishing industry would be viable. Population density off Mossel Bay was inadequate, but False Bay proved promising, although it was concluded that the exploitable area was too small.» DIJKSTRA, H. H. & R. N. KILBURN. 2001. The family Pectinidae in South Africa and Mozambique (Mollusca: Bivalvia: Pectinoidea). African Invertebrates, 42: 263-321, figs. 1-55. [p. 286-288]
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Pecten sulcicostatus Sowerby, 1842; H. H. Dijkstra & R. N. Kilburn, 2001, The family Pectinidae in South Africa and Mozambique, figures 20-22.
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