Amussiopecten Sacco, 1897
SACCO F. 1897. I Mulluschi del terreni Terziarii del Piemonte e della Liguria. Parte XXIV (Pectinidae). 116 p., pls. 1-21. Carlo Clausen, Torino. [p. 53]
«Gen. PECTEN (PLINIUS), BELON 1553, MÜLL. 1776 (tipo P. jacobaeus (L.)).
Sottog. AMUSSIOPECTEN SACC. 1897 (tipo A. burdigalensis (LK)).
Gruppo di forme piuttosto grandi ma gracili, con coste interne piccole, coste esterne depresse, valve ambidue convesse, non perfettamente combacianti in tutte le parti.
Presenta caratteri misti di Pecten (ricordando per esemplo i Flabellipecten e gli Oopecten), di Chlamys e di Amussium, tanto da lasciare incerti riguardo alla collocazione generica. Il Pecten placenta FUCHS accentua l'affinità cogli Amussium se pure esso non è già attribuibile a detto gruppo; esemplari consimili, ma mal conservati, osservai pure nell'Elveziano torinese. Le serie spinulose che appaiono in alcune forme ricordano quelle dell'Amussìum magellanicum (LK.) ed anche di alcuni Aequipecten, come per esemplo dell'A. Haveri (MICHT.) e deli'A. ? Hofmannì (GOLDF.) forme che pure per altri caratteri si avvicinano agli Amussiopecten. Nell'Oligocene osservansi alcune forme che paiono riferibili a questo gruppo.» FEDERICO SACCO, 1897
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Flabellipecten burdigalensis Lamarck; C. Depéret & F. Roman, 1910-1912, Monographie des Pectinidés néogènes de l'Europe et des Régions voisines. II. Genre Flabellipecten, plate 21, figures 1, 1a, 2, 2a.
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T. R. Waller, 2006, New Phylogenies of the Pectinidae (Mollusca: Bivalvia): reconciling Morphological and Molecular Approaches, figure 1.3.
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«Waller (1991: 15 and fig. 8; Fig. 1.1 herein) hypothesised a close relationship between Pecten Muller, 1776, and Decatopecten Rlippel in Sowerby, 1839, and suggested that the Decatopectinini may serve as a bridge between the Pecten group and the Palliolinae. Amussiopecten Sacco, 1897a, sensu /ato, was shown as the basal member of the Pecten group in the Oligocene, leading to three separate clades represented by the
extant genera Amusium, Pecten, and Euvola (Wailer 1991, fig. 11). Subsequent studies of Amussiopecten and a search for its ancestors in the Eocene and Oligocene have led to new phylogenetic hypotheses (Fig. 1.3): Both the Pecten and Decatopecten groups are derived from an ancestral stock that in turn was derived from the Aequipecten group of WaIler (1991). There is no close relationship between these groups and the Palliolinae. Furthermore, the Decatopecten group as originally defmed is not monophyletic but rather consists of three extant components with separate origins: (a) Decatopecten and allied genera occurring mainly in the 1ndo-Pacific region (WaIler 1986); (b) Annachlamys lredale, 1939, occurring in the western lndo-Pacific region; and (c) Flexopecten Sacco, 1897a (including Proteopecten Monterosato, 1899, and Lissopecten Verrill, 1897), occurring in the Mediterranean and adjacent Atlantic. As indicated in Figure 1.3, the former Decatopecten and Pecten groups are now regarded as two separate monophyletic tribes, Decatopectinini and Pectinini, while the genera Amussiopecten, Amusium, and Euvola comprise a third monophyletic tribe Amusiini. Collective these three groups comprise the subfamily Pectininae.» WALLER, T. R. 2006. New Phylogenies of the Pectinidae (Mollusca: Bivalvia): reconciling Morphological and Molecular Approaches. In: S.E. Shumway & G.J. Parsons (Ed.), 2006: Scallops: Biology, Ecology and Aquaculture, 1-44, figs. 1.1-1.4. [p. 22]
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