Chlamys instar Iredale, 1925
IREDALE, T. 1925. Mollusca from the continental shelf of eastern Australia. Records of the Australian Museum, 14 (4): 243-270. [p. 251, pl. 41, figs. 5-7]
«CHLAMYS INSTAR sp. nov.
(Plate xli, figs. 5, 6, 7.) Chlamys antiaustralis Hedley, BioI. Res. F.I.S. "Endeavour" i, 1, 1911, p. 96 (specimens from 100 fathoms, off Cape Pillar only). Id., May, Proc. Roy. Soc. Tasm., 1912, p. 44, and Check-list Moll. Tasm., 1921, p. 10, and Illustr. Index Tasm. Moll., 1923, pl. iii, fig. 8. Not C. antiaustralis Tate, Trans. Roy. Soc. South Austr., viii, 1886, p. 106, pI. 9, fig. 7.
This is the species referred to by Hedley as being represented in the Cape Pillar dredging by numerous valves reaching up to 100 mm. Adult shell nearly orbicular with ears nearly equal; immature shell higher than broad with ears normally unequal. The adult sculpture is distinctive, in that the ribs bear closely appressed lamellae throughout, while the asperrimus series have the lamellae erect. The juvenile sculpture consists of about twenty-four rather distant flattened ribs without lamellae, the prodissoconch rather large, smooth, shining; the interstices between the ribs, at first smooth, develop regular curved lines like the rungs of a ladder, but these soon close up and the small ribs develop small scales regularly appressed. At each side of the primary a small rib similarly ornamented arises, and then, as growth continues, another similar stronger rib is intercalated, the interval between each bunch of five riblets also showing a central ridge. The elevation of the primary rib preserves the lamellae on the adjoining ribs, whilst those on the rib itself disappear. Colour variable, generally creamy to pale buff externally, purple internally, with a small pallial line and a large white muscle scar, generally coalescing with the line. Hinge line straight, very minutely serrate medially, deep triangular ligament pit. Ears with radials, numerous and ornamented with minute lamellae in left valve, few on auricles of right valve, six on posterior, four to six on anterior, ctenolium large and furrowed. Type, length (or height) 97 mm.; breadth 96 mm.; depth of single valve 14 mm.; juvenile figured, right valve, height 17 mm., breadth 14 mm. Off Cape Pillar, Tasmania, in 100 fathoms.» TOM IREDALE, 1925
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T. Iredale, 1925, plate 41.
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