Meldrum D J, Fleagle J G, Kay R F
Department of Anatomical Sciences, State University of New York, Stony Brook 11794-8081.
Am J Phys Anthropol. 1990 Mar;81(3):413-22. doi: 10.1002/ajpa.1330810310.
Distal portions of humeri from two Miocene Colombian primates were recovered during field work in 1986. The larger IGM 183420 is very similar in size and morphology to the humerus included in the type specimen of Cebupithecia sarmientoi, recovered from La Venta in 1945 (Stirton and Savage: Serv. Geol. Nac. Bogata 7:345-356, 1951) and is assigned to this taxon. IGM 183420 presents a number of features of the humerus associated with clinging postural behaviors in living platyrrhines, including a medial epicondyle with very little dorsal angulation, a cylindrical trochlea, and a contact facet for the coronoid process of the ulna. In these and other features Cebupithecia most closely resembles the extant genus Pithecia. IGM 183512 is approximately the size of Saimiri sciureus and is very similar in morphology to the humerus of this small arboreal quadruped. The medial epicondyle is more dorsally angled, the medial lip of the trochlea is more pronounced and the capitulum is less spherical as compared to Cebupithecia. This fossil is assigned to the taxon Neosaimiri fieldsi.
1986年的野外工作期间，发现了来自两种中新世哥伦比亚灵长类动物的肱骨远端部分。较大的标本IGM 183420在大小和形态上与1945年从拉文塔发现的塞布皮西猿（Cebupithecia sarmientoi）模式标本中的肱骨非常相似（斯特顿和萨维奇：《国家地质服务局，波哥大》第7卷：345 - 356页，1951年），并被归入该分类单元。IGM 183420呈现出一些与现存阔鼻猴类抓握姿势行为相关的肱骨特征，包括内侧髁背侧角度很小、滑车呈圆柱形以及与尺骨冠突的接触小平面。在这些以及其他特征方面，塞布皮西猿与现存的僧面猴属（Pithecia）最为相似。IGM 183512大约与松鼠猴（Saimiri sciureus）大小相当，在形态上与这种小型树栖四足动物的肱骨非常相似。与塞布皮西猿相比，其内侧髁背侧角度更大，滑车内侧唇更明显，并且小头更不呈球形。这块化石被归入新松鼠猴（Neosaimiri fieldsi）分类单元。
