Annachlamys striatula (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. 696]
1758 Ostrea striatula Linnaeus, 1758
1845 Pecten macassarensis Chenu, 1845
1845 Pecten macassarensis Chenu, 1845
Annachlamys striatula (Linnaeus, 1758); B. K. raqines & G. T. Poppe, 2006, A Conchological Iconography, The Family Pectinidae, pl. 30.
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«Striatula. 157. O. testa radiis 16 obliteratis transverse membranaceo striatis, margine interregino. M. L. U.
Habitat in O. Indico Valvula convexior paulo magis gibba, quam planior; color intus flavescens radiorum interstiis albis.» CAROLUS LINNAEUS, 1758
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«Synonyms
Pecten striatulus Bosc, 1802: 260, living, “la mer des Indes”. [junior homonym] Pecten solaris G.B. Sowerby II, 1842: 55, pl. 12, figs 7, 8, 22 (non Born, 1778), living, Macassar and China. Pecten macassarensis Chenu, 1845: pl. 39, figs 4, 4d, living, locality unknown. Syn. nov. Description Shell up to c. 50mm in height, suborbicular, wider than long, inequivalve, slightly inequilateral, right valve more convex than left valve, auricles subequal in size, umbonal angle c. 95°. Both valves with 14–18 regularly arranged, radial lirae. Microsculpture of commarginal lamellae on both valves. Internal carinae. Hinge line straight, byssal notch weak, no ctenolium. Colour very variable, creamy, pinkish or brownish with bright maculations or streaks, inside usually yellowish. Type material H W 1. UUZM, lectotype 61mm 65mm (spm) On 10 May 1990 I traced this specimen in the general collection of the UUZM. The only associated Thunberg label ‘‘dubia’’ probably deceived Odhner and Holm neither of whom isolated this specimen. The name mentioned on Thunberg’s label does not refer to Linnaeus’ described species. Probably he could not place this specimen from the royal cabinet. The type specimen is unmistakably identical with the characteristic features of Linnaeus’ descriptions (1758, 1764). Linnaeus’ diagnosis versus morphological features of lectotype: “radiis 16 obliteratis” (16 radial costae), “transverse membranaceo striatis” (closely arranged fine concentric or commarginal lamellae), “valvula convexior paulo magis gibba, quam planior” (both valves slightly convex), “color intus flavescens” (internal colour yellowish), and “radiorum interstitiis albis” (interstices of radial costae white). On the outside of the left valve near the umbo an ink number ‘‘4’’ is visible, which could not have been written by Thunberg. This number corresponds with other isolated type specimens, viz. O. maxima (‘‘1’’), O. jacobaea (‘‘2’’), and O. ziczac (‘‘3’’). The present specimen is designated herein as the lectotype (Fig. 10E, F). Other material UUZM (not isolated): A box with a left valve (H 56 mm, W 59 mm) and a Thunberg label ‘‘Mus. Carol.XIII’’, together with a modern handwritten ink label ‘‘Dubia’’ of a person unknown (?). A box with a left valve and a Thunberg label ‘striatula’. This specimen resembles O. maxima. A box with two different juvenile left valves and a Thunberg label ‘‘striatula’’, together with a label marked in ink ‘‘587.’’. The smallest valve resembles Pecten albicans Schröter, 1802, the largest being similar to O. maxima. Neither fits the original description of O. striatula. Remarks Linnaeus (1758: 696) referred to the MLU and no specimens could be found in the LSL (Hanley, 1855: 103). Thunberg (1828–18 . . ., MS) did not mention Ostrea striatula in his handwritten list, although two of his labels were in the general collection (see above). He did mention Ostrea dubia from the Karl XIII collection, but not from the Gustaf IV Adolf collection. Some discrepancies exist between Thunberg’s and Odhner’s listings (see Table 4). Nomenclatural status Bosc (1802: 260) described a pectinid species with identical morphological characteristics to those of Linnaeus (1758: 696) but without referring to Linnaeus. Also the locality is only a translation. Therefore Pecten striatulus Bosc, 1802 is a primary junior homonym. Lamarck (1819: 183, no. 21) overlooked Bosc’s name and described a fossil from the environment of Turin with the same species name (a subjective junior homonym; ICZN art. 53c) of Pecten striatulus Bosc, 1802. Current taxonomic position Ostrea striatula Linnaeus, 1758 is a senior synonym of Pecten macassarensis Chenu, 1845, which is a representative species of Annachlamys Iredale, 1939 (type species Pecten leopardus Reeve, 1853 [= Pecten flabellatus Lamarck, 1819]) and placed in the tribe Decatopectinini (Waller, 1986: 40). The current taxonomic combination for the present species is Annachlamys striatula (Linnaeus, 1758).» 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. 396, 397]
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Ostrea striatula Linnaeus, 1758; H. H. Dijkstra, 1999, Type specimens of Pectinidae described by Linnaeus, figures 10E, 10F.
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