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Related Concept Videos

Taxonomy01:31

Taxonomy

Taxonomy is the science of defining and naming groups of biological organisms based on shared characteristics. It uses a hierarchy of increasingly inclusive categories with Latin names. The smallest units of taxonomy, species and genus, are used to assign a formal, taxonomic name to each species in a system. This classification system, referred to as binomial nomenclature, was formalized by Carolus Linnaeus in the 18th century.Hierarchy of TaxonomyThe hierarchy that Carolus Linnaeus first...
Phylogenetic Species Concept in Microbiology01:22

Phylogenetic Species Concept in Microbiology

The phylogenetic species concept (PSC) is a framework used to delineate species based on evolutionary relationships, emphasizing shared ancestry and diagnosable genetic traits. Unlike morphological or biological species concepts, the PSC is particularly advantageous for microbial taxonomy, where traditional reproductive or phenotypic criteria often fall short due to the prevalence of asexual reproduction, minimal morphological differentiation, and widespread horizontal gene transfer among...
Microbial Classification System01:24

Microbial Classification System

Classification is the process of organizing organisms into hierarchically inclusive groups based on their phenotypic similarities or evolutionary relationships. A species comprises one or more strains, and closely related species are grouped into genera. Genera are further classified into families, families into orders, orders into classes, and so forth, up to the domain level, which is the broadest taxonomic rank derived from a combination of phenotypic and genotypic data.The nomenclature of...
Phylogenetic Trees03:21

Phylogenetic 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...
Phylogenetic Trees03:21

Phylogenetic 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...
Phylogeny01:23

Phylogeny

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...

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Related Experiment Video

Updated: Jun 12, 2026

A Concoction Pipeline for Generating Molecular Operational Taxonomic Units (MOTUs) Among Riparian and Aquatic Beetles
10:23

A Concoction Pipeline for Generating Molecular Operational Taxonomic Units (MOTUs) Among Riparian and Aquatic Beetles

Published on: July 11, 2025

Species as ranked taxa.

David A Baum1

  • 1Department of Botany, University of Wisconsin-Madison, 430 Lincoln Drive, Madison, WI 53706, USA. dbaum@wisc.edu

Systematic Biology
|June 8, 2010
PubMed
Summary
This summary is machine-generated.

Species are best understood as ranked taxa, not ecological entities. This approach, treating species as exclusive groups based on shared ancestry, aids taxonomic clarity and supports 21st-century biodiversity informatics.

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Area of Science:

  • Taxonomy and Systematics
  • Evolutionary Biology
  • Bioinformatics

Background:

  • Species names are crucial for scientific communication.
  • Defining species remains challenging due to genealogical discordance.
  • Existing species concepts struggle to reconcile evolutionary history with practical classification.

Purpose of the Study:

  • To propose a framework for understanding species as ranked taxa.
  • To address the challenges of grouping and ranking in species delimitation.
  • To facilitate a taxonomic revolution for improved biodiversity informatics.

Main Methods:

  • Defining taxa as exclusive groups forming a clade for a plurality of the genome.
  • Proposing a semisubjective application of species-ranking criteria by practitioners.
  • Utilizing genealogical and other data for assigning organisms to unique species-ranked taxa.

Main Results:

  • Taxa can be understood as exclusive groups based on genomic plurality.
  • Species rank assignment requires practitioners' judgment using defined criteria.
  • This species-as-ranked-taxa concept allows for flexibility in matching traditional species concepts.

Conclusions:

  • Viewing species as ranked taxa offers a robust solution to grouping challenges.
  • Species rank is a designation by practitioners, not an objective criterion.
  • This paradigm shift is essential for advancing taxonomy and biodiversity informatics.