Hinge line

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File:Mytilidae hinge.jpg
The hinge of a blue mussel, Mytilidae

A hinge line is an imaginary longitudinal line along the dorsal edge of the shell of a bivalve mollusk where the two valves hinge or articulate. The hinge line can easily be perceived in these images of a mussel shell and an ark shell.[1][2][3]

The hinge teeth, structures which control the articulation of the valves, are often but not always situated along the hinge line.

File:Arcidae hinge.jpg
Part of the hinge line of one valve of an ark shell, Arcidae

References

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