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in its anterior half. The margins of the patella as well as its dorsal surface are smooth and lack tubercles or radial ribs. The slender and moderately wide median field expresses itself as a keel-like elevation above the depressed hyperbolar zone, which is the part of the rachis enclosed by the patella. The free rachis is slightly shorter than the patella. M. spinosa is very similar in its morphology to M. scutellaris, but its gladius exhibits spine-like structures on its dorsal surface as well as faint ribs radiating from the apex of the patella,

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