Costellamussiopecten deletus (Michelotti, 1861)
MICHELOTTI, G. 1861. Études sur le Miocène inférieur de l’Italie septentrionale. Natuurkundige verhandelingen van de Hollandsche maatschappij der wetenschappen te Haarlem [2e verzameling], 15 (1): 1-183, pls. 1-16. [Études sur le Miocène inférieur de l’Italie septentrionale. Haarlem: Les Héritiers Loosjes, 1861] [p. 77, pl. 9, figs. 1-3]
1861 Pecten deletus Michelotti, 1861
1897 Aequipecten deletus var. intercosticillatina Sacco, 1897
1897 Aequipecten deletus var. intercosticillatina Sacco, 1897
G. Michelotti, 1861, plate 9.
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«Testa orbiculari, convexiuscula, aequilaterali; valva inferiore ad latera costis, striisque exquisite granulato-asperis praedita, in medio costis rotundato-laevigatis; superiore costis interstitiisque minute granulato-asperis.
Loc. Dego. Ter. mioc. infér. Belle espèce à bords arrondis qui atteint 50 millimètres de diamètre. Sur la valve inférieure on compte 20 côtes arrondies, aplaties aux deux extrémités latérales, où l'on observe d'autres stries plus petites et lamelleuses: les oreillettes paraissent avoir été égales. La valve supérieure, soit sur les côtes, soit dans leurs intervalles, laisse apercevoir de nombreuses granulations en lignes longitudinales, ce qui rapproche cette espèce du Pecten Haueri dont les deux valves n'offrent cependant pas la différence que l'on aperçoit dans le Pecten deletus. Mon cabinet.» GIOVANNI MICHELOTTI, 1861
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«Locality and Material.— Ramle, one specimen.
Description.— A suborbicular, equivalve, moderately inflated, slightly inequilateral Chlamys with about sixteen rounded ribs in each valve, separated by interspaces of about their own width. The ribs of the right valve are slightly more prominent than those of the left. In the right valve both ribs and interspaces are smooth. In the left valve both ribs and interspaces are ornamented with squamose radial threads, but those on the ribs are faint. The auricles in each valve are of moderate size, subequal, and faintly ribbed. Remarks.— The difference in the sculpture of the two valves is the chief feature which distinguishes typical C. deleta from certain Miocene forms (C. cameretensis (Fontannes) and C. praescabriuscula (Fontannes)), which it closely resembles. The specimen now described has rather fewer ribs than those figured by Michelotti, Sacco, and Rovereto (in which the number is 18-20). The ribs are relatively wider in the right valve figured by Michelotti, but not in those figured by the other authors cited. Distribution.— Lower to Upper Oligocene of Venetia, Middle Oligocene of Liguria. Oligocene of San Marino, Sicily, Malta, southern France, and Algeria. Fuchs (1875, p. 99) also records this species from the Aquitanian of Malta, but I doubt his determination, as also that of Miocene specimens from Persia figured by him (1879, p. 105, pl. ii, fig. 7) as Pecten cf. deletus. Specimens from the Upper Oligocene of the Trentino figured by Venzo (1933a, pl. i, figs. 13, 14) as Flabellipecten deletus appear incorrectly determined; the true Pecten deletus is not a Flabellipecten. The specimen from the "Priabonian" of Cyrenaica recorded by Newton (1911, p. 644) as Aequipecten cf. deletus has only 9-10 ribs and is probably unrelated.» COX, L. R. 1934. On the occurrence of the Marine Oligocene in Palestine. Geological Magazine, 71: 337-355, pls. 16-18. [p. 346, 347]
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Chlamys (Aequipecten) deleta (Michelotti), forma typica; L. R. Cox, 1934, On the occurrence of the Marine Oligocene in Palestine, plate 17, figures 4a, 4b; Chlamys (Aequipecten) deleta (Michelotti) var. intercosticillatina Sacco, figures 1a, 1b.
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