Excellichlamys Iredale, 1939
IREDALE, T. 1939. Mollusca. Part 1. In: Great Barrier Reef Expedition 1928-29, B.M.(N.H.), Scientific Reports, pls. 1-7. [p.366]
«Genus Excellichlarnys nov.
Type: Pecten spectabilis Reeve.
This very beautiful "Pecten" is differentiated from any other Australian group by several distinct features. The general appearance is that of "Pecten" as contrasted with "Chlamys", its strong sculpture recalling that of Gloripallium.
Shell rather small, inequivalve, a little inequilateral, the right valve convex, left valve flat, ears large and unequal. The sculpture consists of rounded raised ribs, with deep interstices, twelve or so in number, with curious sculpture. The umbones are smooth, then arise radials, which later produce scales which flatten into bodies closely appressed, giving the appearance of coarse roping; the ribs on the right valve are regular in size, but on the left broad raised ribs alternate with namower lower ones; the interstices are finely scabrous; with age scaly radial threads arise in these hollows. The ears are sculptured with scaly radials and there is a small byssal notch with a seven-toothed ctenolium. The hinge shows a small triangular ligament and the hinge line is finely crenulate throughout, but there are no cardinal crura present. The edges of the ears are coarsely denticulate and fit tightly.» TOM IREDALE, 1939
|
Pecten spectabilis Reeve; L. A Reeve, 1852-1853, Monograph of the genus Pecten. In: L. A. Reeve (Ed.), 1843-1878, Conchologia Iconica; or illustrations of the shells of molluscous animals, volume 8, plate 29, figure 128.
|
Excellichlamys spectabilis (Reeve); H. H. Dijkstra & A. G. Beu, 2018, Living scallops of Australia and adjacent water, figures 36D, 36F.
|
«Excellichlamys Iredale, 1939
Excellichlamys Iredale, 1939: 366. Type species (by original designation): Pecten spectabilis Reeve, 1853; Recent, unknown locality [(sub)tropical Indo-West Pacific].
Diagnosis. Small to medium-sized Decatopectinini with 9–12 radial plicae, elongate to subcircular, most species with large unequal auricles; with commarginal macro- and microsculpture, prominent noduliferous radial sculpture on auricles, short internal rib carinae, weak resilial hinge teeth (dorsal and intermediate teeth absent), byssal notch shallow, ctenolium obsolete to prominent.
Distribution. Miocene–Recent (Hayami, 1989: 15). Tropical Indo-West Pacific, living in the littoral to sublittoral zones amongst coral or coral rubble on soft sediment.
Discussion. Hertlein (1969: N366) treated Excellichlamys as a subgenus of Semipallium Lamy, 1928, placed in the Decatopecten group. However, Excellichlamys differs strongly in morphology from Semipallium, which has shagreen microsculpture and is placed in Pedini. Waller (1986: 40) raised Excellichlamys to a genus and placed it in Decatopectinini.»
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. 190]
|