DSC_5027 Oval trough clam (Cyclomactra ovata) detail of siphon amongst seagrass. Shallowly buried in soft mud, usually in sheltered harbours and esturine mudflats, not open shores. Shell colour usually white, but may be stained brown from rust deposits, or black from anaerobic mud. Moeraki *
DSC_1708 Large trough clam, or whangai karoro (Spisula discors) live animal with siphon extended. Buried in clean sand off open coasts, and usually found on slightly less exposed beaches than the Surf clam (Spisula murchisoni). Shell colour usually white with a straw coloured periostracum. Warrington *
DSC_2393 Large trough clam, or whangai karoro (Spisula discors) detail of smooth surface on the lateral teeth of the hinge, which distinguished it from the almost identical Surf clam (S. murchisoni). Buried in clean sand off open coasts, and usually found on slightly less exposed beaches than the Surf clam. Shell colour usually white with a straw coloured periostracum. Warrington *
