Aequipecten tehuelchus tehuelchus (Orbigny, 1846)
ORBIGNY, A. D'. 1846. Mollusques. In: A. d'Orbigny, Voyage dans l'Amerique Meridionale. Tome Cinquième. 3ª Partie. Paris & Strasbourg. France. pp. 489-758. [p. 662, pl. 85, fig. 21-24 (tome nouviéme, atlas zoologique)]
1846 Pecten tehuelchus Orbigny, 1846
1852 Pecten vanvincqii Bernardi, 1852
1853 Pecten darwinii Reeve, 1853
1881 Pecten pycnolepis Martens, 1881
1852 Pecten vanvincqii Bernardi, 1852
1853 Pecten darwinii Reeve, 1853
1881 Pecten pycnolepis Martens, 1881
A. d'Orbigny, 1846, plate 85.
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«T. testa subrotunda, depressa , rosea rubro-maculata, radiatïm costata; valvi superiore costis 16 rotundatis longitudinaliter 5-costulatis, squamosis interstitiisque bicostatis, squamulosis; valva inferiore albida, auriculis inaequalibus.
Dimensions: Longueur, 55 mill. Par rapporl à la longueur: largeur, [?]/100; épaisseur, 36/100; longueur de la facette du ligament, 63/100; angle apicial sans les oreilleltes, 95 degrés. Coquille arrondie, très-déprimée, subéquivalve , subéquilatérale, ornée de seize côtes rayonnantes arrondies, égales en largeur aux sillons qui les séparent, pourvues chacune de trois côtes longitudinales squameuses; entre chacune le sillon renferme deux petites côtes squameuses. La valve inférieure est seulement un peu plus plate et moins colorée. La valve supérieure est rose avec des taches d'un beau rouge. Cette espèce, analogue de forme au P. purpuratus , a ses côtes tout autrement ornées. Nous l'avons recueillie sur la côte delà Patagonie, entre le Rio Negro et la Bahia de San-Blas. Elle est très-rare.» ALCIDE D'ORBIGNY, 1846
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«The non-commercial Flexopecten felipponei formed a monophyletic group with the two subspecies of Aequipecten tehuelchus. Waller (1991, 2006) concluded that Flexopecten s.s. would be related to Aequipecten and restricted to the Mediterranean and adjacent eastern Atlantic with a single ‘outlier’ species, F. felipponei, occurring in the western South Atlantic. Orensanz et al. (1991), on the examination of soft tissue and simultaneous hermaphroditism of numerous individuals with intermediate characters, proposed that ‘F.’ felipponei would be only a phenotypic variant of A. tehuelchus, a hypothesis supported by our results. We found that Flexopecten glaber is grouped together with Aequipecten opercularis within the Pectinidae, both being phylogenetically distant from F. felipponei. This result is in agreement with those of Canapa et al. (2000), but in contrast with the results of Waller (1991) who placed Flexopecten as a member of the Decatopecten group, distant from Aequipecten.
Our phylogenetic reconstruction suggests that the clade formed by the three morphotypes of the Tehuelche scallop distributed along the south-western Atlantic Ocean is more closely related to the genus Argopecten from the Eastern Pacific and North and Central-Western Atlantic than to the other members of the genus Aequipecten, including the type species of the genus, Aequipecten opercularis (Linnaeus 1758), a species distributed in the Norwegian and Mediterranean seas (Huber, 2010). Aequipecten tehuelchus was originally classified in Chlamys (d’Orbigny 1842) and considered a species of this genus until Waller (1991) and Del Río (1992) transferred it to Aequipecten, even though Aequipecten is primarily distributed to the North Atlantic. A more comprehensive phylogenetic reconstruction of the family Pectinidae (Alejandrino et al., 2011; but see also: Saavedra & Peña, 2006; Puslednik & Serb, 2008; Feng et al., 2011) showed that the monophyletic genus Chlamys, including the type species Chlamys islandica (O. F. Müller, 1776), is very distant to both genera Argopecten and Aequipecten. In our phylogeny, the Tehuelche scallop is located in a basal position within the clade formed by the species belonging to the genus Argopecten. Therefore, we recommend transfer of the species including the forms: A. t. tehuelchus, A. t. madrynensis and Flexopecten felipponei, to the genus Argopecten Monterosato, 1889.»
TROVANT, B., L. E. REAL, A. M. PARMA, J. M. ORENSANZ & N. G. BASSO. 2018. Evolutionary relationships of the Tehuelche scallop Aequipecten tehuelchus (Bivalvia: Pectinidae) from the south-western Atlantic. Journal of the Marine Biological Association of the United Kingdom, 2018: 1-9, figs. 1-3. [p. 6, 7]
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«Phenotype variation of the Tehuelche scallop. To the left: Flexopecten ‘felipponei’ of two different sizes; to the right at the top, Aequipecten tehuelchus
‘tehuelchus’ and below, Aequipecten tehuelchus ‘madrynensis’»; B. Trovant, L. E. Real, A. M. Parma, J. M. Orensanz & N. G. Basso, 2018, Evolutionary relationships of the Tehuelche scallop Aequipecten tehuelchus (Bivalvia: Pectinidae) from the south-western Atlantic, figure 1. |
«Marshall (1995: 4) placed the Patagonian scallop, Aequipecten tehuelchus (d'Orbigny, 1846), in Lindapecten. However, the deeply arcuate commarginal lamellae on rib flanks in the early ontogeny of this species, as well as its cool-temperate to cold-water occurrence, suggest that it should remain in Aequipecten.»
WALLER, T. R. 2011. Neogene Paleontology of the Northern Dominican Republic. 24. Propeamussiidae and Pectinidae (Mollusca: Bivalvia: Pectinoidea) of the Cibao Valley. Bulletins of American Paleontology, 381: 1-197, pls. 1-18. [p. 80]
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«Remarks [Pecten pycnolepis Martens, 1881]. Martens (1881b) provided measurements for a single shell, which is not interpreted as designation of a holotype. The text of the description is silent in regard to the number of specimens on which it is based. Following recommendation 73F (Avoidance of assumption of holotype) of the ICZN (1999), the present specimen is not considered as the holotype. It matches the measurements provided in the description and is designated as the lectotype.
The name is a junior synonym of Lindapecten tehuelchus (Orbigny, 1846). Also Pecten vanvincqii Bernardi, 1852 and Pecten darwini Reeve, 1853 are conspecific (Waloszek, 1984: 233). It lives sublittorally to upper bathyally along the eastern coast of South America from southern Brazil to southern Argentina.» DIJKSTRA, H. H. & F. KÖHLER. 2008. An annotated catalogue of Recent Pectinoidea (Mollusca, Pectinidae and Propeamussiidae) type material in the Museum of Natural History, Humboldt University, Berlin. Zoosystematics and Evolution, 84 (1): 31-44. [p. 41]
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Pecten pycnolepis Martens, 1881; H. H. Dijkstra & F. Köhler, 2008, An annotated catalogue of Recent Pectinoidea type material in the Museum of Natural History, Humboldt University, Berlin, figure 4b.
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