Semipallium Jousseaume in Lamy, 1928
LAMY, E. 1928. Les Peignes de la Mer Rouge (d'après les materiaux recueillis par Ie Dr. Jousseaume). Bulletin du Muséum d'Histoire Naturelle, Paris, 34: 166-172, 219, 229. [p. 169]
«"Philippi (1844 , Abbild. Conch., I, Pecten, p. 101, pl. I, fig. 6), a indiqué de la Mer Rouge le P. tigris Lk.: je n’y ai trouvé aucune trace de celle espèce; aussi ne peut-on admettre l’assertion de cet auteur qu’avec un point de doute; ne serait-ce pas un P. sanguinolentus qui aurait été pris pour un P. tigris?" (Dr J.).
Le Dr Jousseaume range ce P. tigris dans un genre Semipallium caractérisé par des coquilles aplaties, allongées obliquement, inéquilatérales, à oreillettes très inégales.» EDOUARD LAMY, 1928
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Pecten tigris Lamarck, 1819. Lectotype MNHN (Paris); H. H. Dijkstra, 1994, Type specimens of recent species of Pectinidae described by Lamarck (1819), preserved in the Muséum d'Histoire Naturelle of Geneva and the Muséum National d'Histoire Naturelle of Paris, plate 17, figures 70-74.
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Semipallium flavicans (Linnaeus); H. H. Dijkstra & A. G. Beu, 2018, Living scallops of Australia and adjacent waters, 80F, 80G.
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«Semipallium Lamy, 1928
Semipallium [Jousseaume] Lamy, 1928: 169. Type species (by original designation): Pecten tigris Lamarck, 1819 (= Ostrea flavicans Linnaeus, 1758). Recent, Indo-West Pacific.
Belchlamys Iredale, 1929: 164. Type species (by original designation): Pecten aktinos Petterd, 1886. Pleistocene and Recent, southern Australia. Diagnosis. Byssate Pedini with a prosocline disc, evenly or unevenly spaced strong to weak primary radial plicae, delicate secondary radial riblets in late ontogeny of most species; shagreen microsculpture throughout ontogeny; auricles very unequal in size; inner surface plicate with edges carinate close to ventral margin; byssal notch deep, ctenolium well-developed. Hinge with moderately weak resilial and dorsal teeth
Distribution. Early Oligocene–Recent. Semipallium foulcheri (Tenison Woods, 1865), occurring in the Willungan (= lower Oligocene) part of the Port Willunga Formation, South Australia, and up to Balcombian (middle Miocene) (Beu & Darragh, 2001, p. 69) is the earliest species we know of. Tropical Indo-West Pacific and temperate Australia, living in the littoral to sublittoral zones among coral or coral rubble on soft sediment (usually sand).
Discussion. Hertlein (1969: N365) treated Semipallium as an extant Indo-West Pacific genus, placed in the Decatopecten group. Waller (1993: 202) considered it to be a genus of Chlamydini (i.e., Pedini), and discussed the close morphological similarity to Manupecten Monterosato, 1872 (Waller, 1991: 24–25).
The identical characters of Semipallium and Belchlamys were discussed for the first time by Beu & Darragh (2001: 67). Iredale (1929: 164) proposed Belchlamys expressly as a subgenus, along with Talochlamys and Veprichlamys, apparently of Mimachlamys Iredale, 1929, although the intended genus is far from obvious.» DIJKSTRA, H. H. & A. G. BEU. 2018. Living scallops of Australia and adjacent waters (Mollusca: Bivalvia: Pectinoidea: Propeamussiidae, Cyclochlamydidae and Pectinidae). Records of the Australian Museum, 70 (2): 113-330, figs. 1-102. [p. 260, 261]
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