"pertaining to the spinal cord," 1835, medical Latin, from nucha "spinal cord" (c.1400), from Medieval Latin nucha, from Arabic nukha "spinal marrow."
The marginal rim is widest at the posterior end of the carapace and lacking in the nuchal area.
The groove between the maxillary and the nuchal crest is very shallow.
Most animals have a conspicuous Cinnamon patch on the nuchal region.
The lateral parts of the nuchal overlie the second pair of ribs.
In Octopoda there is no nuchal cartilage, but two band-like “dorsal cartilages.”
The spot where the river takes its rise is called by some nuchal, and by others Dara.
It has no nuchal spine, and no trace of paired fins is preserved.
Cranial shield wide, rounded anteriorly, deeply indented in nuchal margin; orbital rim not apparent in dorsal aspect.
nuchal region light bluish gray; flanks dark gray; dorsal ground-color dark brown, somewhat paler posteriorly.
nuchal: Width of anterior margin, 12 (estimated); greatest width, 37 (estimated); length at midline, 35 (estimated).