costal groove

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Noun1.costal groove - groove between the ribs where the nerves and blood vessels are
vallecula, groove - (anatomy) any furrow or channel on a bodily structure or part
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lacertina were differences in costal groove counts, size, and vertebral characteristics.
75), noting that this taxon has the lowest costal groove count of all the sirens.
The specimen was black on the dorsal surface and gray beneath, with numerous cuts or bite marks across the costal grooves.