The Smallest Anthropoids:The Marmoset/Callimico Radiation represents a comprehensive examination of the callimico/marmoset clade, including the smallest anthropoid primates on earth. It explores these diminutive primates from a variety of perspectives including: phylogeny; reproductive, social, and cognitive behavior; ranging behavior and locomotion; anatomy; and conservation. In the last twenty years, the number of taxa recognized in this group has increased from three genera and five species to five genera comprising at least 22 species. Additionally, our understanding of the evolutionary relationships among these taxa has undergone substantial revision, and all are now considered to be closely related to one another (including callimicos). This volume is the first to synthesize data on these newly recognized taxa. It features contributions from geneticists, anatomists, and behaviorists around the world, providing access to major findings of key international researchers whose work has not been easily available to English-speaking scholars. These contributors use field and lab data to test major hypotheses on behavior, evolution, cognition, and other issues.

This volume represents a comprehensive examination of the newly recognized callimico/marmoset clade, which includes the smallest anthropoid primates on earth. It will explore these diminutive primates in their entirety, with sections on phylogeny, taxonomy and functional anatomy, behavioral ecology, reproductive physiology, as well as address critical conservation issues and the need for conservation action. The topics specifically selected for this volume are pivotal for understanding the evolutionary adaptations and divergence of any primate group, and especially one as diverse and curious as this. The discoveries of new taxa over the last fifteen years along with new genetic data have transformed this group from three genera (one with only a distant relationship to the others) and five recognized species, to five closely related genera, comprising at least 22 species. This volume will be the first to synthesize data on these newly recognized taxa.This volume is an international endeavor, bringing together primary callimico and marmoset researchers from around the globe, including Brazil and the United States as well as Greece, Italy, Switzerland, and Germany. One of the merits of this volume is that it will serve as a readily accessible work that includes the major findings of several key international researchers whose work has not been easily available to English-speaking scholars. In addition, it draws together lab and field researchers, geneticists, anatomists, and behaviorists in an integrated volume that will provide the most detailed and thorough work on either callimicos or marmosets to date. This volume will also provide a timely forum for identifying future avenues of action necessary for more fully understanding and protecting this intriguing primate radiation.

Phylogeny.- Molecular Phylogenetics of the Callitrichidae with an Emphasis on the Marmosets and Callimico.- The Systematics and Distributions of the Marmosets (Callithrix, Callibella, Cebuella, and Mico) and Callimico (Callimico) (Callitrichidae, Primates).- The Vocal Identity of the Callithrix Species (Primates, Callitrichidae).- Reproductive, Social, and Cognitive Behavior.- Social Behavior of Callimicos: Mating Strategies and Infant Care.- Genetic Structure Within and Among Populations of the Common Marmoset, Callithrix jacchus: Implications for Cooperative Breeding.- Mating Systems and Female-Female Competition in the Common Marmoset, Callithrix jacchus.- Balancing Cooperation and Competition in Callitrichid Primates: Examining the Relative Risk of Infanticide Across Species.- Social Hierarchy and Dispersal in Free-Ranging Buffy-Headed Marmosets (Callithrix flaviceps).- Emigration as a Reproductive Strategy of the Common Marmoset (Callithrix jacchus).- Social and Physical Cognition in Marmosets and Tamarins.- Ranging Behavior and Locomotion.- Limited Dispersal and Genetic Structure of Silvery Marmosets (Mico argentatus) in the Fragmented Landscape of Central Amazonia.- Habitat Use and Ranging Behavior of the Silvery Marmoset (Mico argentatus) at Caxiuanã National Forest (Eastern Brazilian Amazonia).- Ranging Patterns of Callimico goeldii (callimico) in a Mixed Species Group.- A Comparative Study of the Kinematics of Trunk-to-Trunk Leaping in Callimico goeldii, Callithrix jacchus, and Cebuella pygmaea.- Locomotion, Postures, and Habitat Use by Pygmy Marmosets (Cebuella pygmaea).- Anatomy.- Mother's Little Helper? The Placenta and Its Role in Intrauterine Maternal Investment in the Common Marmoset (Callithrix jacchus).- Size and Shape in Callimico and MarmosetSkulls: Allometry and Heterochrony in the Morphological Evolution of Small Anthropoids.- Cranial Morphology of the Dwarf Marmoset Callibella in the Context of Callitrichid Variability.- The Functional Significance of Jaw-Muscle Fiber Architecture in Tree-Gouging Marmosets.- The Evolutionary Morphology of Tree Gouging in Marmosets.- Marmoset Postcrania and the Skeleton of the Dwarf Marmoset, Callibella Humilis.- Conservation.- Conservation Status of Pygmy Marmosets (Cebuella Pygmaea) in Ecuador.- Conservation of the Marmosets and Callimicos.