Parvamussium squamula (Lamarck, 1806)
LAMARCK, J. B. 1806. Suite des mémoires sur les fossiles des environs de Paris. Annales du Muséum d'Histoire Naturelle, 8: 347-355 [p. 354]
1806 Pecten squamula Lamarck, 1806
1832 Pecten squamulosus Deshayes, 1832
1832 Pecten squamulosus Deshayes, 1832
Pecten squamula Lamk.; G. P. Deshayes, 1824-1832, Description des Coquilles fossiles des environs de Paris, plate 45, figures 16-18.
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«5. Peigne en écaille. Vèlin , n. 39, f. 5.
Pecten (squamula) orbicularis, minimus , subocto-radiatus; radiis internis, n.
L. n. Parnes. Ce peigne singulier est si petit que les plus grands individus ne l'emportent point par leur taille sur i'anomia squamula. La surface extérieure de ses valves est lisse et n'offre aucune cannelure rayonnante; ce qui peut être dû à quelque encroûtement de cette surface; mais I'intérieure presente sept ou huit rayons bien distincts qui n'atteignent pas tout-à-fait le bord des valves. Les oreilles de cette petite coquille sont inégales et lisses des deux côtes.
Cabinet de M. Defrance.» JEAN BAPTISTE LAMARCK, 1806
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«This is exceedingly rare; I have seen it only in Mr. Edwards's cabinet. It is a miniature representation of P. pleuronectes, and, like that species, is externally smooth, and has its rays or costse upon the inner surface: the exterior seems to have been glossy, and the left valve was probably ornamented with colour in zigzag, somewhat like P. similis; the shell is extremely thin, and the internal costae can be distinctly seen on the outside. The auricles are large, as is usually the case in minute species of this genus, and the one on the pedal side is the larger of the two; this in the right valve is rounded at the angles, and ornamented with about half a dozen elevated and imbricated rays, and sinuated near its junction with the shell. In the left valve, the auricle on the pedal side is also larger, but it is neither rounded at its upper angles, nor sinuated beneath. It is most probably identical with the Paris Basin shell, and is not very distantly related to another small fossil species, P. squama, Scac. (P. pygmaeus, Münst.), but this is said to be furnished with as many as twenty rays on the inside of the valves. The figure with this name in ' Goldf. Pet. Germ.,' pl. 99, fig. 6 a, b, appears a larger shell; but it has the same number of internal ribs, and corresponds in other respects. Nilsson, ' Petrificana Suecana,' p. 24, t. ix, fig. 18 A B, describes a species, P. inversus, which is intermediate in size between squamula, Goldf., and pygmaeus, Münst.
Pecten squamula (Geinitz 'Charak. der Schicht und Petr. des Sach. Bohm, Kreid,' p. 83, taf. xxi, fig. 8) is altogether a different species.» WOOD, S. V. 1861. A Monograph of the Eocene Bivalves. Vol 1. Paleontographical Society [Monograph, 1861-1871], 182 p., pls. 1-25. [p. 44, 45]
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Pecten squamula Lamarck; S. V. Wood, 1861, A Monograph of the Eocene Bivalves, plate 9, figures 6a, 6b.
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