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Shell Morphology
d Dreissena presbensis

Photos: Lubomir Andreev

Triangular shape

Dorsal Surface
Forms a high wing
Lateral Surface Distinct angle (carina) ascending at the beginning and extending about three-quarters of the total shell length, located laterally
Ventral Surface
The posterior ventral surface is convex; S-shaped when viewed laterally
Ventral Margin
Usually straight
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Byssal groove located at front quarter of the ventral side

The two valves are bilaterally symmetrical
Colour pattern
Not distinct stripes; gray - light violet colour
Maximum shell length (mm) 40 (published data)
45 (project 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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