Decatopecten plica (Linnaeus, 1758)
LINNAEUS, C. 1758. Sistema Naturae per Regna tria
Naturae, secundum classes, ordines, genera, species, cum characteribus,
differentiis, synonymis, locis. Tomus I. Editio Decima,
Reformata, [iii], 824 p. Impensis Direct. Laurentii Salvii. Holmiae [Stockholm], 1758. [p. 697, sp. 162]
1758 Ostrea plica Linnaeus, 1758
1817 Pallium striatum Schumacher, 1817
1842 Pecten velutinus G. B. Sowerby II, 1842
1842 Pecten subplicatus G. B. Sowerby II, 1842
1817 Pallium striatum Schumacher, 1817
1842 Pecten velutinus G. B. Sowerby II, 1842
1842 Pecten subplicatus G. B. Sowerby II, 1842
«Distribution. — Throughout (sub)tropical Indo-Pacific, except Hawaii and Polynesia, southwestern limit northern Zululand, South Africa. South Africa and Mozambique: 34-47 m (Dijkstra & Kilburn, 2001: 278), Red Sea: 2-40 m (Dijkstra & Knudsen, 1998: 56), Indonesia: 48-57, dead (Dijkstra, 1991: 41), Philippines: 10-25 m (Raines, 2010: 602), South China Sea, Taiwan to Honshu, Japan: intertidal to 50 m (Bernard, Cai & Morton, 1993: 51). Present specimens from the Philippines alive at 5-55 m. The bathymetric range of live-taken specimens is from intertidal to 55 m. Living amongst rubble on muddy or clean sand bottoms.
Remarks. — The present material from the Philippines is in all characters similar to the type material. This species is polymorphic in valve convexity (inflated to compressed), in development of radial plicae (weak to prominent), in number of plicae (3-5, with 2 or 3 lateral ribs), and in coloration. Material from Japan (in literature often identified as D. striatus) may be considered as a local form of D. plica. It is possible, that the similar-looking species, D. amiculum (Philippi, 1851), with some more radial plicae (8-11), and living in the same habitat as D. plica, also belongs to the polymorphic variability of D. plica.» DIJKSTRA, H. H. 2013.
Pectinoidea (Bivalvia: Propeamussiidae and Pectinidae) from the Panglao region,
Philippine Islands. Vita Malacologica, 10:
1-108, pls. 1-32 pls, 2 tabs. [p. 30]
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Decatopecten plica (Linnaeus, 1758); H. H. Dijkstra, 2013, Pectinoidea from the Panglao region, plate 7, figures 1a-d.
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«Remarks; The present species [Decatopecten striatus (Schumacher, 1817)] is rather common in the Nakoshi Formation. The species is defined by having subequilateral shell, well round ventral margin, flat umbonal area, 3-5 main radial ribs with concentric step and fine riblets on and intemal ribs, 2-3 paired inner ribs on ventral border, fine crenulation on inner ventral margin, rather smali muscle scar, trigonal ear, elongated cardinal crura and no byssal notch. The right valve is smoothly swollen but light valve has concentric gape at ventral margin and narrowly elevated ribs.
The present species resembles Decatopecten amiculus in shell form and extemal sculptures, but the latter has much number of radial ribs (7-8). Decatopecten plica also resembles the present species but the former has small number of radial ribs.» NODA, H. 2002. Molluscan fossils from the Ryukyu Islands, Southwest Japan – Part 4, Gastropoda and Pelecypoda from the Nakoshi Formation in the Motobu Peninsula, Okinawa-jima –. Science Reports of the Institute of Geosciences, University of Tsukuba [Section B], 23: 53-116, figs. 1-20. [p. 68]
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Decatopecten striatus (Schumacher, 1817); H. Noda, 2002, Molluscan fossils from the Ryukyu Islands, figures 9.3a, 9.3b, 9.6a, 9.6b.
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«Description: Shell thick, height to 55 mm, but most adults 30–35 mm, elongate to suborbicular, nearly equivalve, equilateral, auricles small and subequal, umbonal angle ca. 85–95°. Both valves strongly convex to more compressed, with prominent radial plicae (3–5, usually 3) and smaller lateral ribs (2–3), both plicae and their intervals radial striated. Microsculpture of close-set commarginal lamellae. Auricles with several radial riblets (8–14) and microscopic commarginal lamellae. Hinge small and straight. Byssal fasciole absent, byssal notch narrow. Active ctenolium with a few small teeth (1–3) on suture, sometimes absent. Resilifer elongate, triangular. Auricular crura strongly developed, resilial teeth weak or absent. Inner surface slightly plicated. Colour variable, cream, yellow, orange or brown with lighter or darker markings, occasionally uniform in colour; RV paler than LV.
Type material: O. plica: syntypes in LSL and UUZM (not registered), lectotype in LSL (designated Dijkstra 1999). P. striatum: lectotype ZMUC BIV-59 herein designated; paralectotype ZMUC BIV-60. P. velutinus: lectotype BMNH 1996405/1 herein designated; 2 paralectotypes BMNH 1996405/2-3. P. subplicatus: type material not present in BMNH (K. Way and J. Pickering pers. comm.). P. strangei: lectotype BMNH 1950.11.14.74 herein designated, 2 paralectotypes BMNH 1950.11.14.75–76. Regional data (all NMSA, selected records only): MOZAMBIQUE: Macoque, beachdrift (G4998: E. Roscoe); Santa Carolina Is., Bazaruto Archipelago, dead on sandbank (K2281: E. Roscoe); Inhaca Is. (4488: P. H. Boshoff). SOUTH AFRICA (all NMDP, unless otherwise stated): Zululand: between Bhanga Neck and Kosi Bay, off outer edge of No. 13 reef, ca. 34 m, sand, live (D9814: D. Herbert et al.); NE of Kosi Bay, 42–44 m, fine sand, dead (S5309); off Kosi Bay, dredged, dead, 40 m, shell rubble, dead (D7973); same loc., 45 m, fine muddy sand, dead (D6039); same loc., 47 m, dead coral, sponges, large algae, living (D6133); SE of Kosi Bay, 40 m, shell rubble (D8138); off Lala Nek, 70 and 72 m, dead (S6625, S7011); SE of Rocktail Bay, 60 m, dead (S5221); off Sodwana, 49–53 m, sand, dead (S4728). Distribution: Throughout tropical Indo-Pacific, except Hawaii and Polynesia, southwestern limit northern Zululand. Habitat: Living free between coral rubble on muddy or clean sand bottoms at littoral to sublittoral depths. Remarks: D. plica shows extreme polymorphic variability in various characters, namely valve convexity (from inflated to compressed), strength of radial plicae (strong to weakly developed), number of plicae (3–5, with 2 or 3 lateral ribs) and coloration. Specimens from Japan (in literature usually identified as D. striatus) and Australia (often identified as D. strangei) may be considered as ecomorphs or local forms of D. plica. Samples from Mozambique and South Africa resemble the type material of D. plica.» DIJKSTRA,
H. H. & R. N. KILBURN. 2001. The family Pectinidae in South Africa
and Mozambique (Mollusca: Bivalvia: Pectinoidea). African Invertebrates, 42: 263-321. [p. 277, 278}
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Decatopecten plica (Linnaeus, 1758); H. H. Dijkstra & R. N. Kilburn, 2001, The family Pectinidae in South Africa and Mozambique, figures 12, 13.
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«Type locality
“Habitat in O. Indico”. Restricted herein to Indonesia, according to similar observed material from the NNM and ZMA collections. Type material
LSL (isolated by Hanley):
Three complete unmarked specimens, isolated by Hanley (1855: 105), correspond to Linnaeus’ descriptions (1758, 1764). The largest is designated herein as the lectotype (Fig. 2A–D). No other conspecific specimens were found in the LSL collection. UUZM (isolated by Odhner): Odhner (1953: 5) isolated one specimen from the general collection with a handwritten Thunberg label ‘‘Mus. Gust.Ad.’’ (see Wallin, 1993: 88, Ostrea plica # 493). UUZM (general collection): Probable paralectotypes are cf. Wallin (1993: 88, Ostrea plica # 1048 and 1058) with a printed Swartz label ‘‘Plica’’. Remarks Linnaeus referred to figure O of plate 44 (Rumphius, 1705), which corresponds very well with the selected type specimens and the descriptions of Linnaeus (1758, 1764, 1767). The second reference to Argenville’s figure C of plate 27 [=?24] is more or less obscure and could represent another pectinid species. This species is variable in form (flat to more swollen), in sculpture (low rounded to more prominent radial lirae), in number of primary and secondary radial costae (usually three prominent and two very weak on the anterior and posterior margins), and in colour. Examined material (BMNH, MNHN, NNM and ZMA) from the southern Philippines and Indonesia is typical.» DIJKSTRA, H. H. 1999. Type specimens of Pectinidae (Mollusca: Bivalvia) described by Linnaeus (1758-1771). Zoological Journal of the Linnean Society, 125: 383-443. [p. 404, 405]
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Ostrea plica Linnaeus, 1758; H. H. Dijkstra, 1999, Type specimens of Pectinidae (Mollusca: Bivalvia) described by Linnaeus (1758-1771), figures 2A-2D.
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«Remarks: This species was described by Sowerby (1847) as follows: "Of a rounded, trigonal form, ventricose, thick, radiately striated; auricles small, nearly equal, blunt, striated, contracted at the sides; hinge perpendicularly plicated; there are 3 central ribs, and 2 on each side much smaller; the colour is various, generally a light ground variegated with large patches of a darker colour, the hinge nearly always brown".
Also Reeve's description is as follows: "Shell triangularly ovate, nearly equivalve, equilateral, sides compressed towards the umboes, ears rather small, equal; valves striated throughout, rayed with three to five ribs, ribs of the left valve rounded, raised slanting down near the margin of the right valve, broader, convex, less raised; left valve fulvous-white, broadly marbled with chestnut-red, right valve white, unspotted". The specimens collected from the Toukoushan Formation in the Houlung area, Miaoli Hsien take the following description: Shell rather small in size, rather thin, compressed, high triangular in outline, nearly equilateral, subequivalve; valves radiately ribbed, forming an angle of about 85° at the apex. Right valve a little inflated, with six prominent, rounded radial ribs two of which at the central part of the disc are much more prominent than others, and two at both sides very slender and weak; the surface of the upper part of the disc is nearly smooth but with growth radial ribs tend to become prominent with numerous fine radial threads on their back near the ventral margin; interspaces between radial ribs narrower than the ribs themselves, with fine radial threads near the ventral margin; auricles nearly triangular in outline, subequal to each other, and with fine radial threads. Left valve a little less inflated than right one, with a sculpture similar to that of the right valve except for three prominent radial ribs in the central part of the disc and two weak radial ribs at both sides. Hinge nearly flat, with characteristic cardinal crura. Interior surface is strongly folded corresponding to the radial ribs and with conspicuous rounded, distal denticle near the ventral margin. The present one can be distinguished from Decatopecten striatus (Schumacher), a Recent species of Southwestern Pacific, by its high triangular shell, prominent, high radial ribs and subequal, triangular auricles. Nomura and Zinbo (1934, 1936) reported the present species from the Ryukyu Limestone in Kikai-jima, Kagoshima Prefecture and from the Shimajiri Beds in Okinawa Prefecture, Japan, without illustrations, but they have not been confinned. Dimensions (in mm.):
Recent distribution: Southwestern Pacific (Amami Islands in Kagoshima Prefecture, Japan, as northern limit).
Geologic distribution: Szukou Formation in Pingtung Hsien and Toukoushan Formation in Miaoli Hsien, Taiwan. Geologic range: Pleistocene to Recent. MASUDA, K. & C. HUANG. 1994. Tertiary and Quaternary Pectinidae from northern Taiwan. Journal of the Geological Society of China, 37 (4): 497-549, pls. 1-10. [p. 516, 518]
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Placopecten plicus (Linnaeus, 1758); K. Masuda and C. Huang, 1994, Tertiary and Quaternary Pectinidae from northern Taiwan, plate 5, figures 9-15.
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«The Pecten plicatus of Chemnitz (P. plica of Lamarck) has been accepted generally as the representative of the Linnean species. The circumstance of a form (the variety subplicata) of this Pecten being present in the Linnean cabinet confirms, in some measure, the traditional determination, which it is not expedient, perchance, to disturb. The description, however, is inadequate, for even the details of the ' Museum Uliicse ' with the peculiarities of the hmge will apply to more species than one;* and the illustrative engravings, though usually cited for Pecten plicatus are somewhat doubtful representations of it: Argenville's figure, indeed, is more like the P. undulatus of Sowerby's Monograph (Thes. Conch, vol. i. pl. 19, f. 205).
"Auriculis aequalibus" is added in the revised copy of the 'Systema,' and "striatis" substituted for "decussato-striata."» HANLEY, S. C. T. 1855. Ipsa Linnaei Conchylia. The Shells of Linnaeus, Determined from his Manuscripts and Collection. Williams & Norgate. London. [p. 105] |
A. J. D. d'Argenville, 1752, L’Histoire naturelle éclaircie..., plate 27, figure C.
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