Shell smooth and yellow-brown, sometimes tinged with green or with a chevron pattern. Specimens from crowded intertidal beds often very elongated and almost rectangular in cross-section. Submerged, fast-growing specimens are taller and narrower.
Up to 125 mm.
The dominant mussel on the South and East coasts, forming dense beds from the mid-intertidal to a few meters depth. The flesh of females is bright orange and of males off-white.
Two Oceans: A Guide to the Marine Life of Southern Africa (1994, 2016)
F*CK FISH 
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