Mactra lilacea (Lamarck, 1818)
Indian Ocean, Red Sea, eastern Mediterranean.
Above and below:
Shallow water, in sand, Kiryat Yam, Haifa, NW. Israel. 37-41mm.
« Sculpture of irregularly spaced dense concentric ridges and lines, more pronounced at the anterior part of the shell, less prominent towards the posterior half » (CIESM).
Synonyms: decora, pulchra….
Can be confused with M. olorina Philippi, 1846.
Consult the CIESM to see the differences.
Mactra decora in L. A. Reeve: Conchologia iconica vol. VIII plate XVI, London 1855, via BHL.
 
« Shell ovately transverse, swollen, inequilateral, shining, elegantly rayed and transversely zoned with white and violet, anterior side the shorter, obtuse, transversely finely irregularly grooved, grooves disappearing towards the middle ; umboes rather swollen, dark violet, but little distant ; lunule two-coloured with white and violet, regularly plicated, area rather concave, thinly plicated. Of a Cytherea aspect, grooved on the anterior half, elegantly banded and faintly rayed with cinereous violet. »
A typical species of the upper infralittoral.
Al Sawadi Beach, Suwadi Al Batha, Muscat Governorate, NE. Oman. 44,9mm.

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