Final answer:
The space between the upper lateral incisor and the canine in an ape that accommodates a large lower canine is called a diastema.
Step-by-step explanation:
In an ape, the space between the upper lateral incisor and the canine that accommodates a large, projecting lower canine is known as a diastema. This gap allows for the comfortable placement of the large canines when the jaw is closed. The cuspid or canine teeth flank the incisors and are used for tearing and shredding food, which makes the diastema an important feature for efficient eating habits in non-human primates.