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Shell Morphology
d Dreissena bugensis

Photos: Lubomir Andreev

Shape
More rounded triangular shape
Dreissena_bugensis-2
Dorsal Surface
Rounded, often with winglike extension
Lateral Surface
Not distinct rounded angle (carina), located laterally
Ventral Surface
Convex ventral surface; when placed on its ventral side the mussel will topple over
Ventral Margin
S-shaped
left click for zoom!
Byssal
Small byssal groove at front third of the ventral side

Dreissena_bugensis3



Valves
The two valves are clearly asymmetrical when viewed from the anterior or the ventral side
Colour pattern
Dark-brown colour with striped pattern; stripes are smooth in shape; shells usually have dark concentric rings
Maximum shell length, (mm) 33-40 (published data)
Dreissena polymorpha
Dreissena bugensis
Dreissena presbensis
Dreissena blanci

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This website is developed with support from the Bulgarian Science Fund, Ministry of Education, Youth and Science,
within the Project "Assessment and Management of Dreissena spp. Invasions in the Bulgarian Water Bodies",
Contract Number: DO-02-283/2008.

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