Related Experiment Video
Updated: May 6, 2026
09:47
Microdissection of Black Widow Spider Silk-producing Glands
Published on: January 11, 2011
15.4K
Systematics, phylogeny, and evolution of orb-weaving spiders
Gustavo Hormiga1, Charles E Griswold
1Department of Biological Sciences, The George Washington University, Washington, DC 20052;
Annual Review of Entomology
|October 29, 2013
Summary
Orb-weaving spiders (Orbiculariae) are diverse, with most species not building typical orb webs. Their evolutionary history and relationships remain unclear, requiring further research.
Area of Science:
- Arachnology
- Evolutionary Biology
- Systematics
Background:
- Orb-weaving spiders (Orbiculariae) represent over 25% of known spider species.
- They exhibit diverse web structures, with the primitive orb web being rare among modern species.
- Orb-weavers have a fossil record dating back to the Jurassic period.
Purpose of the Study:
- To investigate the evolutionary relationships and phylogeny of orb-weaving spiders.
- To clarify the monophyly of major orb-weaver taxa (Deinopoidea and Araneoidea).
- To identify the sister group of the Orbiculariae.
Main Methods:
- Phylogenetic analysis using molecular data.
- Examination of morphological characteristics.
- Review of existing fossil and molecular evidence.
Main Results:
- The monophyly of cribellate Deinopoidea and ecribellate Araneoidea is weakly supported by molecular data.
- The sister group to Orbiculariae remains unidentified.
- A fully resolved cladogram for Orbiculariae families has not yet been achieved.
Conclusions:
- Orb-weaver evolution is complex, with diverse web-building strategies.
- Current phylogenetic data are insufficient to fully resolve orb-weaver relationships.
- Further research with expanded taxon sampling, comparative morphology, and new molecular markers is essential.
More Related Videos
Related Concept Videos
02:40The Tree of Life - Bacteria, Archaea, Eukaryotes
36.6K
The “tree of life” describes the evolution of life and the evolutionary relationships between organisms. The root of the tree is the common ancestor to all life on Earth. All other species radiate from this point, much like the branches of a tree. The numerous tips of these branches on the tree of life represent every living, or extant, species. Extinct species, which are species that no longer exist, can be found towards the center of the tree. Currently, these organisms, both...
36.6K
01:23Phylogeny
47.3K
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 kingdom.
47.3K
02:54Evolutionary Relationships through Genome Comparisons
5.9K
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...
5.9K
02:40Pollination and Flower Structure
65.0K
Flowers are the reproductive, seed-producing structures of angiosperms. Typically, flowers consist of sepals, petals, stamens, and carpels. Sepals and petals are the vegetative flower organs. Stamens and carpels are the reproductive organs.
65.0K
01:28Microbial Phylogeny
91
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,...
91
03:21Phylogenetic Trees
41.7K
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.
41.7K