Beschadigde en één gerepareerde Zwanenmossel Anodonta cygnaea (Linnaeus, 1758) langs de Moksloot op Texel

An apparently by rats consumed Swan mussel Anodonta cygnaea (Linnaeus, 1758) (a freshwater mussel) was collected along a ditch (Moksloot) in the dunes of the Wadden isle of Texel (province of North Holland, the Netherlands). This specimen had a repaired hole of 6 x 8 mm in its outer shell layer, well within the pallial line. On the inside of the shell this hole was invisible because it was covered by new shell layers formed by the mantle. However, a 43 x 21 mm large hollow area was present between the outer and inner shell layers, filled now with black mud. The producer of this hole remains unknown, but the Swan mussel showed to be able to repair it.