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In strepsirrhines (i.e., lemurs and lorises), this bony enclosure takes the form of a postorbital bar only, while haplorhines (i.e., tarsiers, monkeys, apes, and humans) also possess a postorbital plate.

A. True
B. False

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Final answer:

Yes, it is true that strepsirrhines have only a postorbital bar while haplorhines also have a postorbital plate, denoting a distinct evolutionary trait between the two primate groups.

Step-by-step explanation:

The statement that in strepsirrhines, such as lemurs and lorises, the bony enclosure takes the form of a postorbital bar only, while haplorhines, which include tarsiers, monkeys, apes, and humans, also possess a postorbital plate is True. Strepsirrhines have unique characteristics compared to haplorhines, including a grooming claw and a toothcomb. Haplorhines, which have more reliance on vision and include both diurnal and larger-brained primates compared to the generally nocturnal strepsirrhines with a more developed sense of smell, have a fully enclosed bony eye socket, providing greater eye protection and structural support.

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