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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There was a distinct costal groove on the external faces of the shafts of the 3rd, 4th, and 5th ribs.
lacertina were differences in costal groove counts, size, and vertebral characteristics.
The specimen was black on the dorsal surface and gray beneath, with numerous cuts or bite marks across the costal grooves. The number of toes ranged from three to two, but the rear limbs were damaged and toes likely removed.