Zygochlamys moerickei (Hertlein, 1936)
HERTLEIN, L. G. 1936. Three new sections and rectifications of some specific names in the Pectinidae (II). The Nautilus, 50: 54-58. [p. 55]
Pecten tenuicostatus; G. Gay, 1854, Historia física y política de Chile, Zoología, plate 5, figure 4.
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«PECTEN MÖRICKEI, new name
Pecten tenuicostatus Hupe, Hist. Fis. y Pol. de Chile, Zool., Vol. 8, 1854, p. 291, Atlas Coq. pi. 5, fig. 4. ''Habita fosil en los faluns de Chiloe."— Möricke, Neues Jahrb. f. Min. Geol. und Palaeo., Beil. Bd. 10, 1895-1896, p. 580, pl. 12, figs. 13, 14, 15, 16. "Tubul (Philippi)." Chile. Tertiary. Not Pecten tenuicostatus Mighels & Adams, Proc. Boston Soc. Nat. Hist., Vol. 4, 1841 [1844 on title page but pp. 1-54 were issued in 1841 according to Meisel], p. 49. "Habitat, Casco Bay."— Boston Journ. Nat. Hist., Vol. 4, no. 1, Jan., 1842, p. 41, pl. 4, fig. 7. [ = Pecten grandis Solander, Portland Cat., 1786, p. 50. See Dall, NAUTILUS, Vol. 34, no. 3, 1921, p. 99. Pecten magellanicus Gmelin is a synonym according to Dall, NAUTILUS, Vol. 38, no. 4, 1925, p. 112.] The name tenuicostatus was proposed as a specific name for a pecten by Mighels & Adams much earlier than by Hupe. The name mörickei is here proposed for the species from Chile described by Hupé.» LEO GEORGE HERTLEIN, 1936
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TYPE MATERIAL [Pecten tenuicostatus Hupé, 1854]: Holotype housed in the Typothèque of the Laboratoire de Géologie under number MNHN-Gg2002/55 (a well preserved right valve).
TYPE LOCALITY. ‘Faluns de Chiloé’ (Cliffs of Chiloé Island, Chile). The term ‘cliffs’ recalls the locality of Cucao, which, however, is older (Miocene) than either Tubul or Isla Guamblín (Pliocene) where this species was recorded (see below).
REMARKS. This species is quite common in Tubul, but not so in Chiloé. Philippi (1887) had doubts about Hupé’s (1854) reference to Chiloé as the locality and believed it did not occur further south of Tubul. However, such a southward range was confirmed by Frassinetti & Covacevich (1995: 53) who recorded it from Guamblín Island. All shell features of this species indicate it belongs in Zygochlamys and it was synonymised with the extant Z. patagonica (King & Broderip, 1832) by S.N. Nielsen & C. Valdovinos (unpublished results). Zygochlamys patagonica is the type species of Psychrochlamys Jonkers, 2003, which we consider a synonym of Zygochlamys Ihering, 1907 (type species Pecten geminatus Sowerby, 1846, see above).
GRIFFIN, M. & S. N. NIELSEN. 2008. A revision of the type specimens of Tertiary molluscs from Chile and Argentina described by d’Orbigny (1842), Sowerby (1846), and Hupé (1854). Journal of Systematic Palaeontology, 6 (3): 251-316, pls. 1-24. [p. 287]
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Zygochlamys tenuicostatus (Hupé, 1854), holotype; M. Griffin & S. N. Nielsen, 2008, A revision of the type specimens of Tertiary molluscs from Chile and Argentina, plate 16, figures 5, 6.
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«Stratigraphical age and distribution. (Late?) Pliocene (Fleming, in Watters & Fleming, 1972; Biró Bagóczky, 1979; Fig. 25). Fossils occur on Isla de Chiloé and in Arauco Province (Tubul Formation), southern Chile (Fig. 20); a single specimen from Quebrada Chañaral de Azeitunas, central Chile, was tentatively identified as this species (Plate 8, fig. b).
Remarks. This species closely resembles Psychrochlamys patagonica in size, overall shell shape and width of umbonal angle; the flat rib crests in most specimens also suggest close affinity. Main differences are the flatter RV the somewhat shorter outer ligament, and a much shallower byssal notch in P. moerickei than in P. patagonica (Fig. 34; Plate B). It is possible that P. moerickei represents just a subspecies of P. patagonica, but in view of the limited amount of material examined, the taxon is upheld at specific rank.» JONKERS, H. A. 2003. Late Cenozoic-Recent Pectinidae (Mollusca: Bivalvia) of the Southern Ocean and neighbouring regions. Monographs of Marine Mollusca, 5: i-viii + 1-125 pp, 17pls. Backhuys Publishers, Leiden. [p. 52]
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Psychrochlamys moerickei (Hertlein); H. A. Jonkers, 2003, Late Cenozoic-Recent Pectinidae (Mollusca: Bivalvia) of the Southern Ocean and neighbouring regions, plate 8, figures a, b.
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