ciało-człowieka: Taxonomy (biology)

Evidence: 100 • authority: 72

In biology, taxonomy (from Ancient Greek τάξις (taxis) 'arrangement' and -νομία (-nomia) 'method') is the scientific study of naming, defining (circumscribing) and classifying groups of biological organisms based on shared characteristics. Modern approaches prioritize common ancestry and evolutionary relationships. Organisms are grouped into taxa (singular: taxon), and these groups are given a taxonomic rank; groups of a given rank can be aggregated to form a more inclusive group of higher rank, thus creating a taxonomic hierarchy. The principal ranks in modern use are domain, kingdom, phylum (division is sometimes used in botany in place of phylum), class, order, family, genus, and species…

Evidence: 79 • authority: 72

In biological taxonomy, a taxonomic rank denotes the level that a group of organisms—either taxon or clade—occupies in a hierarchical system of classification, which is usually but not necessarily based on evolutionary relationships between those organisms. Some authors prefer to use the term nomenclatural rank, contending that, according to some definitions, the hierarchical rank occupied by a group of organisms is more accurately described as concept of nomenclature rather than taxonomy. In general, the most inclusive taxa (or clades), such as the Eukarya and Animalia, are assigned the highest ranks in a particular system of taxonomy, whereas the least inclusive ones, such as Homo sapiens…

Evidence: 53 • authority: 72

In biology, a taxon is a group of one or more populations of an organism, or organisms, as seen by taxonomists to form a biological unit; (taxon: back-formation from taxonomy; pl.: taxa). Although neither is required, a taxon, once its description has become established, is usually known by a particular name and is given a particular ranking.

Evidence: 53 • authority: 72

Evidence: 47 • authority: 92

A novel transformer model of protein domains for viral taxonomy classification.. Motivation Viruses with carefully curated taxonomic assignments (such as those in the ICTV taxonomy) still represent only a small fraction of viruses identified through sequencing data from virome or microbiome projects. It is therefore critical to develop methods that can assign viruses at multiple taxonomic ranks, so that a virus deemed novel at a given rank may still be placed into a higher-level taxon. Sequence-similarity-based approaches can classify viruses that share substantial genomic similarity with known viruses (e.g. those belonging to the same species or genus); however, their performance drops sig…

Evidence: 47 • authority: 92

Virus community views on the possible extension of virus taxonomic assignments to a below-species rank.. The International Committee on Taxonomy of Viruses (ICTV) is considering a proposal submitted in July 2025 to create an optional additional taxonomic rank below the level of species. This was designed to increase the precision of taxonomic assignment where clinical or other regulatory distinctions need to be made between viruses assigned to the same species. To understand current classification practice and to gauge opinion on the proposal to formalize a below-species taxon, current ICTV study group members ( n =746) representing over 100 Study Groups were invited to complete a survey, f…

Evidence: 45 • authority: 92

Virus taxonomy and the ICTV - 21 FAQs for the perplexed virologist.. Just over 125 years has passed since the 'filterable' agents of tobacco mosaic disease and foot-and-mouth disease were first described as infectious, replicating entities smaller than bacteria. Today, viruses are formally classified into more than 16,000 species ranked into genera, families and higher taxa. The development of an official virus taxonomy has been overseen by an International Committee, first constituted in 1966 and renamed as the International Committee on Taxonomy of Viruses (ICTV) in 1975. Despite the engagement of the ICTV in virus taxonomy over the last 60 years, many aspects of virus classification and…

Evidence: 45 • authority: 72

Linnaean taxonomy can mean either of two related concepts: The particular form of biological classification (taxonomy) established by Carl Linnaeus, as set forth in his Systema Naturae (1735) and subsequent works. In his taxonomy Linnaeus described three kingdoms, each divided into classes, and the classes divided into lower ranks in hierarchical order. A general term for ranked classification of organisms. That is, taxonomy in the traditional sense of the word: rank-based scientific classification—which especially is used as opposed to the method of cladistic systematics, which groups organisms into clades. Ranked classification is attributed to Linnaeus even though he neither invented the…

Evidence: 42 • authority: 92

Evidence: 42 • authority: 92

Perseus: lineage-aware refinement of Kraken2 taxonomic classification for long read metagenomes.. Motivation Long-read metagenomic sequencing improves assembly contiguity and enables genome-resolved analysis of complex microbial communities, but accurate taxonomic classification of long reads and assembled contigs remains challenging. Highly scalable k-mer-based classifiers such as Kraken2 frequently over-assign fine-rank taxonomic labels when applied to long-read data, producing high false positive classification rates driven by sparse or localized k-mer matches, particularly in microbiomes with extensive taxonomic novelty. Results We present Perseus, a lineage-aware confidence estimation…

Evidence: 42 • authority: 72