Postcranial specimens of Simiolus enjiessi and other primitive catarrhines from the early Miocene of Lake Turkana, Kenya
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Abstract:

Postcranial specimens of Simiolus enjiessi and related taxa from the Lake Turkana region of Kenya are described. These specimens come from the early Miocene sites of Buluk, Kalodirr, and Moruorot. The specimens include 13 limb bones and one vertebra. Where comparisons are possible, the Simiolus material is quite similar to that of the other East African Miocene genera, Dendropithecus, Kalepithecus, Limnopithecus, and Micropithecus. These taxa share no derived features with extant hominoids and are best considered as primitive, non-cercopithecoid, non-hominoid catarrhines. The functional features of their postcrania are not closely similar to those of other Miocene catarrhines or of any extant anthropoids. The majority of postcranial features resemble those of generalized platyrrhines. These together with some specialized features, particularly of the humeroradial joint, point to the importance of arboreal quadrupedalism in the positional repertoire. The relative length of the long bones, together with specific features, especially of the humerus and femur, also indicate a suspensory capability, possibly expressed in postural activities and bridging behavior.

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