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  • Title: The term "lateral recess" and craniofacial pneumatization in old world monkeys (Mammalia, Primates, Cercopithecoidea).
    Author: Rae TC, Koppe T.
    Journal: J Morphol; 2003 Nov; 258(2):193-9. PubMed ID: 14518012.
    Abstract:
    The primate superfamily Cercopithecoidea (or Old World monkeys) is characterized by a widespread lack of the maxillary sinus, a paranasal pneumatic space found in most other eutherian mammals. Previous discussions of the distribution of pneumatization in the group, however, have been ambiguous and contradictory, and have been further complicated by discussion of a poorly defined structure named the "lateral recess," linked implicitly to the maxillary sinus. Computed tomography (CT) was applied to dry crania of all cercopithecoid genera to evaluate the morphological relevance of the term "lateral recess." Results suggest that the "lateral recess" is a structural consequence of changes in skull form unrelated to pneumatization. Thus, the term should be abandoned. All Old World monkeys (except the genus Macaca) are found to lack the maxillary sinus, but a previously undescribed bulla, only separated from the nasal cavity anteriorly, was discovered in the Chinese golden monkey Rhinopithecus. If this bulla is related to the paranasal sinuses, it suggests that the initial change in cercopithecoid cranial evolution was a suppression of pneumatic development, which may have been subsequently reversed twice in the history of the group, in Macaca and Rhinopithecus.
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