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myostracum. In DICTIOUS you will not only get to know all the dictionary meanings for the word
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English
Noun
myostracum (plural myostraca)
- (zoology) Part of shell wall secreted at attachment of adductor muscles.
1964, Shell Structure and Muscle Scars of Cap-shaped Archaeogastropods:At this place in the myostracum the smaller, second-order prisms […] range from two to 15 microns in diameter.
2014, Adolf Seilacher, Alan D. Gishlick, Morphodynamics, page 68:In contrast to the muscle scars, the growth tracks of which are marked by a radial stretch of myostracum, the growth track of the pallial line is the boundary surface between two shell layers.