Related Experiment Video
Updated: Aug 4, 2026
12:00
A Practical Guide to Phylogenetics for Nonexperts
Published on: February 5, 2014
Phylogenetic analysis of anthropoid relationships
1Department of Anatomical Sciences, State University of New York at Stony Brook 11794-8081, USA.
Journal of Human Evolution
|September 28, 1998
Summary
This study resolves primate relationships using morphological data, uniting tarsiers, anthropoids, and omomyiforms into the Haplorhini clade. It refutes the adapid-anthropoid hypothesis, clarifying early primate evolution and fossil placement.
Area of Science:
- Primate phylogeny
- Paleoanthropology
- Evolutionary biology
Background:
- Primate evolutionary relationships, particularly among anthropoids and early fossil forms, remain a subject of debate.
- Existing hypotheses are often based on limited datasets, leading to divergent conclusions.
Purpose of the Study:
- To resolve the phylogenetic relationships of anthropoids and other primates.
- To investigate the evolutionary connections between fossil and living primate taxa.
- To test the adapid-anthropoid hypothesis and establish the placement of early fossil anthropoids.
Main Methods:
- Analysis of 291 morphological characters from 57 living and fossil primate taxa.
- Utilized phylogenetic analysis software PAUP and MacClade.
- Integrated dental, cranial, and postcranial evidence.
Main Results:
- Cranial evidence supports the tarsier-anthropoid hypothesis; postcranial evidence supports monophyletic Prosimii and Anthropoidea.
- Combined data strongly support a tarsier-anthropoid clade within omomyids, including Eosimias and Afrotarsius.
- The adapid-anthropoid hypothesis is rejected; Anthropoidea is monophyletic, but synapomorphies evolved mosaically.
- A Haplorhini clade uniting Tarsius, Anthropoidea, and Omomyiformes is supported, though internal relationships require further resolution.
Conclusions:
- Morphological data robustly unites tarsiers, anthropoids, and omomyiforms within Haplorhini.
- The study clarifies the position of early fossil primates like Eosimias.
- Phylogenetic uncertainty persists regarding the precise relationships within Haplorhini, necessitating further research.
Related Concept Videos
01:23Phylogeny
Phylogeny is concerned with the evolutionary diversification of organisms or groups of organisms. A group of organisms with a name is called a taxon (singular). Taxa (plural) can span different levels of the evolutionary hierarchy. For instance, the group containing all birds is a taxon (comprising the class Aves), and the group of all species of daisies (the genus Bellis) is a taxon. Phylogenies can likewise include just one genus (i.e., depict species relationships) or span an entire...
03:21Phylogenetic Trees
Phylogenetic trees come in many forms. It matters in which sequence the organisms are arranged from the bottom to the top of the tree, but the branches can rotate at their nodes without altering the information. The lines connecting individual nodes can be straight, angled, or even curved.The length of the branches can depict time or the relative amount of change among organisms. For instance, the branch length might indicate the number of amino acid changes in the sequence that underlies the...
02:54Evolutionary Relationships through Genome Comparisons
Genome comparison is one of the excellent ways to interpret the evolutionary relationships between organisms. The basic principle of genome comparison is that if two species share a common feature, it is likely encoded by the DNA sequence conserved between both species. The advent of genome sequencing technologies in the late 20th century enabled scientists to understand the concept of conservation of domains between species and helped them to deduce evolutionary relationships across diverse...
03:21Phylogenetic Trees
Phylogenetic trees come in many forms. It matters in which sequence the organisms are arranged from the bottom to the top of the tree, but the branches can rotate at their nodes without altering the information. The lines connecting individual nodes can be straight, angled, or even curved.The length of the branches can depict time or the relative amount of change among organisms. For instance, the branch length might indicate the number of amino acid changes in the sequence that underlies the...
02:31Synteny and Evolution
John H. Renwick first coined the term “synteny” in 1971, which refers to the genes present on the same chromosomes, even if they are not genetically linked. The species with common ancestry tend to show conserved syntenic regions. Therefore, the concept of synteny is nowadays used to describe the evolutionary relationship between species.
Around 80 million years ago, the human and mice lineages diverged from the common ancestor. During the course of evolution, the ancestral chromosome underwent...
Around 80 million years ago, the human and mice lineages diverged from the common ancestor. During the course of evolution, the ancestral chromosome underwent...
01:28Microbial Phylogeny
Understanding the evolutionary relationships among microorganisms is fundamental to microbial ecology and taxonomy. Phylogenetic trees are essential tools for inferring these relationships, relying primarily on comparative analyses of molecular sequences such as DNA, RNA, or proteins. In microbial studies, these trees typically depict the evolutionary paths of diverse bacterial and archaeal species by mapping genetic differences accumulated over time.Phylogenetic trees are composed of tips,...