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hinge line
A hinge line 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.〔http://paleo.cortland.edu/tutorial/Bivalves/bivalvemorph.htm〕〔''Bivalves'' by J.H. Leal, Bailey-Matthews Shell Museum, Florida, USA http://www.shellmuseum.org/BivalvesLeal.pdf〕〔Invertebrate Paleobiology on-line syllabus on Bivalves, by Dr. Burt Carter, Georgia Southwestern State University, at: http://itc.gsw.edu/faculty/bcarter/paleo/labs/moll/biv2.htm〕
The hinge teeth, structures which control the articulation of the valves, are often but not always situated along the hinge line.
==References==
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