Anthropoid Origins: New Visions by Callum F. Ross, Richard F. Kay

By Callum F. Ross, Richard F. Kay

This moment variation should be an edited quantity of curiosity to those that do examine and educate concerning the evolution of primates. It goals to express to primatologists, anthropologists, palaeontologists, and neuroscientists the latest experiences of primate phylogeny, the anthropoid fossil checklist, the evolution of the primate visible procedure, and the starting place of the anthropoid social structures. This identify incorporates a CD-ROM and colour figures.

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A small, nocturnal visual predator, with orbits highl y approximated below the olfactory tract, provided 26 Callum F. Ross and Richard F. Kay the most likelysubstrate from which an anthropoid lineage could evolve, leading him to follow Cartmill (1980) and Rosenberger (1986) in suggesting that anthropoids are likely to have evolved from omomyiforms (Ross, 1996). Ross (1995b) suggested that strepsirrhines did not evolve anthropoid-like features when they became diurnal because strepsirrhines likely evolved diurnality at a larger body size than the ancestral anthropoid, with concomitant differences in the allometric effects on orbit orientation.

Ross and Richard F. Kay and a fused mandibular symphysis resulted in a pattern of stresses in the facial skull that necessitated the presence of a postorbital septum. The absence of symphyseal fusion in basal anthropoids, which have septa, effectively falsifies this hypothesis. Ross hypothesized that increased orbital frontation and convergence necessitated the presence of a postorbital septum to protect the orbital contents; the level of frontation in Simonsiusgrangeri is relevant to this hypothesis (Simons, Chapter 8, this volume).

The only way to shorten the branch lengths of the extant primate clades is to discover new fossils; this fact suggests that both molecular and morphological data will be needed to resolve the question of basal primate cladogenesis. , 1999), and the suggestion that primates might have been distinct in the Cretaceous (Martin, 1993), have raised the possibility that the anthropoid stem lineage (Beard and MacPhee, 1994; Culotta, 1992; Fleagle and Kay, 1994b; Godinot, 1994), or the common lineage of tarsiers and anthropoids (Ross, 2000), branched off prior to the diversification of omomyiforms and adapiforms in the early Eocene.

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