Taxonomy Classifier — Kingdom to Species
Look up the complete 7-level taxonomic classification for 32 organisms across Animalia, Plantae, Fungi, Bacteria, and Protista. Search by common name, scientific name, or kingdom. No signup, runs entirely in your browser.
⏱ 6 min read · Complete guide below
How to Use the Taxonomy Classifier
- 1Search by common name, scientific name, or kingdom to find an organism.
- 2Read the full 7-level classification: Kingdom, Phylum, Class, Order, Family, Genus, Species.
- 3Note the binomial name — genus capitalised, species lowercase, both italicised.
- 4Compare two organisms to see at which level their lineages diverge.
Worked Example: How Closely Related Are a Lion and a House Cat?
Look up the lion (Panthera leo) and the domestic cat (Felis catus). Reading down the ranks, they match all the way through Kingdom Animalia, Phylum Chordata, Class Mammalia, Order Carnivora, and Family Felidae — the cat family. They diverge only at the genus level: the lion belongs to Panthera (the roaring big cats) and the house cat to Felis (the smaller purring cats). Sharing five of seven ranks means they are close cousins on the evolutionary tree.
Contrast that with comparing the lion to a mushroom, which splits at the very first rank (Kingdom Animalia vs Fungi) — about as distant as two organisms get. That is the power of the hierarchy: the level at which two lineages stop matching tells you how recently they shared an ancestor. Each rank down the list is a narrower club, and every organism inherits all the ranks above it — so a lion is simultaneously a felid, a carnivore, a mammal, and an animal, all at once.
Why Biologists Classify Living Things
With millions of known species and many more undescribed, biology needs a shared filing system, and that is what taxonomy provides. Classification does three jobs at once. It gives every organism a single, unambiguous scientific name that works across every language, so a researcher in Tokyo and one in Berlin know they are discussing the same species. It organises the diversity of life into nested groups that make information retrievable. And, most powerfully, a modern classification is a map of evolutionary relationships — the hierarchy is not arbitrary but reflects descent from common ancestors, so an organism's place in the tree tells you a great deal about its biology before you have studied it directly.
The Power of Binomial Nomenclature
The two-part naming system devised by Carl Linnaeus in the 18th century is one of biology's most durable inventions. Each species receives a genus name (capitalised) and a speciesepithet (lowercase), both italicised — Homo sapiens, Panthera leo. Common names are hopeless for science: a “robin” means different birds on different continents, and a single animal may have a dozen local names. A binomial fixes exactly one name to exactly one species, worldwide and across time. The genus half also carries information: because Panthera leo (lion) and Panthera tigris (tiger) share a genus, you immediately know they are close relatives, without needing the rest of the classification.
Classification Is Always Being Revised
Taxonomy is not a finished, fixed chart — it is a living hypothesis that updates as evidence improves. For centuries organisms were grouped mainly by how they look, but appearance can mislead: unrelated species evolve similar features, and close relatives can look very different. The rise of DNA sequencing has transformed the field, letting biologists read evolutionary relationships directly from genetic code. This has reshuffled many groups — splitting look-alikes that turned out to be distant, and uniting oddly different species that share deep ancestry. That is why scientific names sometimes change, and why modern classification increasingly follows cladistics, which groups organisms strictly by shared ancestry rather than surface resemblance.
Taxonomy Study Tips
Use the mnemonic
"King Philip Came Over For Good Soup" maps to Kingdom, Phylum, Class, Order, Family, Genus, Species. Or create your own — the important thing is that each level narrows the group, and each level below shares all the levels above.
Domain is above Kingdom
Modern classification adds Domain as the highest level: Bacteria (prokaryotes), Archaea (prokaryotes with different biochemistry), and Eukarya (all eukaryotes). Animalia, Plantae, Fungi, and Protista all fall under Eukarya.
Cladistics vs Linnaeus
Traditional Linnaean taxonomy groups by appearance; cladistics groups by evolutionary history (shared derived characteristics). Modern taxonomy uses both approaches plus DNA sequencing to build phylogenetic trees.
Reading a phylogenetic tree
Each branch point (node) represents a common ancestor. Species that share a more recent common ancestor are more closely related. Humans and chimpanzees share a more recent ancestor with each other than either does with gorillas.
Frequently Asked Questions
What are the 7 levels of taxonomy?
From broadest to most specific: Kingdom → Phylum → Class → Order → Family → Genus → Species. A mnemonic is "King Philip Came Over For Good Soup." Some systems add Domain above Kingdom (Bacteria, Archaea, Eukarya).
What are the five kingdoms?
Animalia (multicellular, heterotrophic), Plantae (multicellular, autotrophic via photosynthesis), Fungi (multicellular, absorptive heterotrophs), Protista (mostly unicellular eukaryotes), and Monera (now split into Bacteria and Archaea in the six-kingdom system).
What is binomial nomenclature?
Binomial nomenclature is the two-part scientific naming system devised by Carl Linnaeus. Each species gets a genus name (capitalised) and a species name (lowercase), both italicised: e.g. Homo sapiens, Panthera leo.
Why do scientific names change over time?
As genetic and molecular data improve our understanding of evolutionary relationships, organisms are reclassified. DNA analysis has moved many organisms that look similar into separate groups and merged others that appear different into the same clade.
What is the difference between a species and a genus?
A genus is a group of closely related species that share a recent common ancestor. A species is a population of organisms that can interbreed and produce fertile offspring. Multiple species can share one genus (e.g. Panthera leo, Panthera tigris, Panthera pardus).
Is this data stored or sent anywhere?
No. The taxonomy database is embedded in the tool and all lookups run locally in your browser with no server communication.
How do I remember the order of the taxonomic ranks?
Use a mnemonic where the first letter of each word matches a rank from broadest to most specific: Kingdom, Phylum, Class, Order, Family, Genus, Species. A classic one is "King Philip Came Over For Good Soup." Some versions add Domain at the top ("Dear King Philip..."). The key idea behind the order is that each rank is a narrower group nested inside the one above it.
What is the difference between Linnaean taxonomy and cladistics?
Linnaean taxonomy, the traditional system, groups organisms into ranked categories largely based on observable characteristics. Cladistics groups organisms strictly by evolutionary ancestry, using shared derived traits and, increasingly, DNA data to build branching diagrams called phylogenetic trees. Modern classification blends the two: the familiar ranks remain, but their membership is decided by evolutionary relationships rather than appearance alone.
Where does Domain fit into the classification?
Domain sits above Kingdom as the broadest rank in modern classification. There are three domains: Bacteria and Archaea (both single-celled prokaryotes with different biochemistry) and Eukarya (all organisms with complex cells, including animals, plants, fungi, and protists). So a full modern classification runs Domain → Kingdom → Phylum → Class → Order → Family → Genus → Species.
Why can two very different-looking organisms be closely related?
Because relatedness is about shared ancestry, not appearance. Evolution can make close relatives look very different when they adapt to different environments, and can make distant species look alike when they face similar pressures (called convergent evolution). This is exactly why DNA evidence has been so revolutionary — it reveals the true family tree even when outward looks are misleading, which is why the classification of some organisms has changed as genetic data accumulated.