Bractechlamys evecta Iredale, 1939
IREDALE, T. 1939. Mollusca. Part 1. Great Barrier Reef Expedition 1928-29, B.M.(N.H.), Scientific Reports., 5 (6): 209-425, 7 pls. [p. 367, pl. 5, figs. 20, 20a]
Bractechlamys evecta sp. nov. (Plate V, figs. 20, 20a.)
«A very pretty little scallop occurred among the dredgings and had previously been secured at Michaelmas Cay. It had most similarity to vexillum Reeve ('Conch. Icon.' VIII, pl. xxvii, fig. 114b, May, 1853: no locality) and to distans Lamarck as figured by Reeve (pl. xiii, fig.49, February, 1853: Philippines). The latter name was replaced by Fischer ('Journ. de Conch.' VII, p. 340, June, 1859) by Pecten janus ex Montrouzier MS. for a New Caledonian species. The availability of the new name for the Queensland shell is negatived by its invalidity, there being a prior Pecten janus Münster ('Goldfuss, Petref German.' II (4), 1833, p. 62, fide C.D.S.) so that the local shell is here described.
Shell somewhat convex, small, inequivalve, almost equilateral, ears unequal; sculpture of a few strong ribs; coloration of one valve brownish with white blotches irregularly arranged concentrically, coloration of the other valve uniformly pale yellow. Hinge with strong lateral teeth, striate, ligamental pit broadly triangular. Sometimes the right valve is coloured., sometimes the left, at times both; one weaker than the other, as if the shell had altered its position. The colouring recalls that of Pecten aurantiacum A. Adams and Reeve (' Zool. Voy. " Samarang ", Mollusca', p. 74, pl xxi, fig. 12, August, 1850) but that species has more ribs. It appears to be constantly smaller than the unamed New Caledonian shell, which is generally darker coloured, with a rougher sculpture, a stronger hinge and the ctenolium obsolete. The type, from Station XIV, measures 35 mm. in height and 30 mm. in breadth.» TOM IREDALE, 1939
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T. Iredale, 1939, plate 5.
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