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Taxonomy: The Tree of Life

An interactive overview of biological classification for the most important taxa. This list is NOT complete and doesn’t include many thousands of less notable taxa. Click the cards or arrows to expand each level or click the “+” sign in the bottom right to toggle what classifications you want to collapse from (K = kingdoms, P = phyla, C = classes). Collapsing down to class is easily digestible.
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Image of Eukaryotes
Domain

Eukaryotes

Eukaryota

2.1B years ago

Organisms whose cells have a nucleus enclosed within a nuclear envelope. This domain includes all animals, plants, fungi, and protists.

Image of Animals
Kingdom

Animals

Animalia

800M years ago

All animals are members of the Kingdom Animalia, also called Metazoa. They are multicellular and heterotrophic. Animal cells lack the rigid cell walls that characterize plant cells.

Animals
Image of Chordates
Phylum

Chordates

Chordata

530M years ago

Chordates are animals that have, at some stage of development, a notochord, a dorsal hollow nerve cord, pharyngeal slits, and a post-anal tail. Most chordates are vertebrates (which means having a vertebral column (backbone) and a cranium (skull); subphylum Vertebrata), and all other animals are called invertebrates, or shortened "inverts."

Chordates
Image of Amphibians
Class

Amphibians

Amphibia

370M years ago

Amphibians are cold-blooded vertebrates that live both in water and on land, including frogs, toads, and salamanders.

Amphibians
Image of Frogs
Order

Frogs

Anura

250M years ago

Anura is the order of amphibians that includes frogs and toads. They are known for their short bodies, webbed digits, and exceptional jumping ability.

Image of Salamanders
Order

Salamanders

Caudata

237M years ago

Caudata is the order of amphibians that contains salamanders and newts. They are characterized by their slender bodies, short limbs, and the presence of a tail in both larvae and adults.

Image of Reptiles
Class

Reptiles

Reptilia

315M years ago

Reptiles are cold-blooded vertebrates that include snakes, lizards, turtles, and crocodiles. They usually have scaly skin and lay eggs.

Reptiles
Image of Turtles
Order

Turtles

Testudines

220M years ago

Testudines is the order of reptiles known as turtles, tortoises, and terrapins. They are characterized by a special bony or cartilaginous shell developed from their ribs.

Image of Lizards and snakes
Order

Lizards and snakes

Squamata

250M years ago

Squamata is the largest order of reptiles, comprising lizards and snakes. Members are distinguished by their scales and movable quadrate bones in the skull.

Image of Crocodiles
Order

Crocodiles

Crocodilia

95M years ago

The order Crocodilia includes crocodiles, alligators, caimans, and gharials. They are large, predatory, semiaquatic reptiles, and are the closest living relatives of birds.

Image of Tuataras
Order

Tuataras

Rhynchocephalia

250M years ago

Rhynchocephalia is an order of reptiles that includes only one living species, the tuatara. Though resembling lizards, they are a distinct lineage that diverged around 250 million years ago. Their genome is one of the largest among vertebrates, significantly larger than that of humans, approximately twice as much.

Image of Birds
Class

Birds

Aves

150M years ago

Birds are warm-blooded vertebrates with feathers, beaks, and wings. They are known for their ability to fly, although some are flightless.

Image of Mammals
Class

Mammals

Mammalia

225M years ago

Mammals are warm-blooded vertebrates that have hair or fur and produce milk to feed their young. This group includes primates, whales, kangaaroos, rodents, armadillos, sloths, bats, carnivorans, pangolins, and more.

Image of Ray-finned fishes
Class

Ray-finned fishes

Actinopterygii

419M years ago

Ray-finned fishes are the most diverse group of fishes, with fins supported by thin, bony spines called rays. They include most of the fish species.

Image of Cartilaginous fishes
Class

Cartilaginous fishes

Chondrichthyes

395M years ago

Chondrichthyes is a class of jawed fish that have skeletons primarily composed of cartilage. These include sharks, rays, and chimaeras.

Image of Arthropods
Phylum

Arthropods

Arthropoda

541M years ago

Arthropods are invertebrates with exoskeletons, segmented bodies, and jointed appendages. This phylum includes insects, arachnids, and crustaceans.

Arthropods
Image of Insects
Class

Insects

Insecta

412M years ago

Insects are the most diverse group of animals, with three body segments, six legs, and usually wings. Examples include ants, bees, and butterflies.

Insects
Image of Beetles
Order

Beetles

Coleoptera

299M years ago

Coleoptera, commonly known as beetles, is the largest order of insects. Beetles have a pair of hardened forewings called elytra and are found in almost every habitat.

Image of Butterflies and moths
Order

Butterflies and moths

Lepidoptera

200M years ago

Lepidoptera includes butterflies and moths, known for their colorful wings and complex life cycle including metamorphosis from caterpillar to adult.

Image of True bugs
Order

True bugs

Hemiptera

300M years ago

Hemiptera, or true bugs, includes insects like aphids, cicadas, and stink bugs. They are characterized by their piercing-sucking mouthparts.

Image of Ants, bees, wasps, and sawflies
Order

Ants, bees, wasps, and sawflies

Hymenoptera

252M years ago

Hymenoptera is a large order of insects, comprising the sawflies, wasps, bees, and ants, many of which are parasitic.

Image of Flies
Order

Flies

Diptera

260M years ago

Insects of this order use only a single pair of wings to fly, the hindwings having evolved into advanced mechanosensory organs known as halteres, and allow dipterans to perform advanced aerobatics.

Image of Grasshoppers, crickets, and katydids
Order

Grasshoppers, crickets, and katydids

Orthoptera

300M years ago

Orthoptera is an order of insects that can fold their wings and produce sounds by rubbing their wings against each other on their legs.

Image of Mantises
Order

Mantises

Mantodea

145M years ago

Mantises are large predatory insects with triangular heads and bulging eyes, supported on flexible necks.

Image of Dragonflies and damselflies
Order

Dragonflies and damselflies

Odonata

325M years ago

Odonata is an order of predatory flying insects that includes dragonflies and damselflies. They are characterized by large, multifaceted eyes, two pairs of strong, transparent wings, and an elongated body.

Image of Cockroaches and termites
Order

Cockroaches and termites

Blattodea

300M years ago

Blattodea is an order of insects that contains cockroaches and termites. They are known for their flattened bodies and are often found in close association with humans or in natural habitats.

Image of Earwigs
Order

Earwigs

Dermaptera

208M years ago

Dermaptera is an order of insects commonly known as earwigs. They are characterized by a pair of pincer-like cerci on their abdomen and are mostly nocturnal.

Image of Stick insects
Order

Stick insects

Phasmatodea

122M years ago

Phasmatodea is an order of insects known as stick insects or walking sticks. They are renowned for their camouflage, which makes them resemble sticks or leaves.

Image of Arachnids
Class

Arachnids

Arachnida

420M years ago

Arachnids have eight legs and include spiders, scorpions, and ticks. They do not have antennae or wings.

Arachnids
Image of Spiders
Order

Spiders

Araneae

386M years ago

Araneae includes spiders, known for their silk-spinning abilities and varied hunting strategies. They have eight legs and typically possess venomous fangs.

Image of Scorpions
Order

Scorpions

Scorpiones

437M years ago

Scorpiones includes scorpions, characterized by their pincers and venomous stinger. They are often found in desert environments.

Image of Mites and ticks
Order

Mites and ticks

Acari

400M years ago

Acari includes mites and ticks, which are small arachnids that can be parasites or free-living. They have diverse habitats and can impact agriculture and health.

Image of Crustaceans
Class

Crustaceans

Crustacea

511M years ago

Crustaceans are aquatic arthropods with a hard exoskeleton, including crabs, lobsters, and shrimp.

Crustaceans
Image of Crabs, Lobsters, and Shrimp
Order

Crabs, Lobsters, and Shrimp

Decapoda

455M years ago

Decapoda is an order of crustaceans that includes many familiar species such as crabs, lobsters, and shrimp. They have ten limbs and a hard exoskeleton.

Image of Barnacles
Order

Barnacles

Cirripedia

300M years ago

Cirripedia includes barnacles, which are sessile crustaceans that attach themselves to surfaces like rocks and ship hulls.

Image of Pillbugs and Woodlice
Order

Pillbugs and Woodlice

Isopoda

300M years ago

Isopoda includes terrestrial and aquatic crustaceans like pillbugs and woodlice. They are characterized by their flattened bodies and are often found in damp environments.

Image of Myriapods
Class

Myriapods

Myriapoda

428M years ago

Myriapods include millipedes and centipedes, characterized by many body segments and numerous legs.

Myriapods
Image of Millipedes
Order

Millipedes

Diplopoda

428M years ago

Diplopoda includes millipedes, which have two pairs of legs per body segment and are primarily detritivores, feeding on decomposing plant matter.

Image of Centipedes
Order

Centipedes

Chilopoda

430M years ago

Chilopoda includes centipedes, which have one pair of legs per body segment and are predatory, feeding on small insects and other invertebrates.

Image of Mollusks
Phylum

Mollusks

Mollusca

540M years ago

Mollusks are soft-bodied animals, often with a hard shell. This phylum includes snails, clams, and octopuses.

Mollusks
Image of Snails and slugs
Class

Snails and slugs

Gastropoda

540M years ago

Gastropods are mollusks with a single, often spirally shell or none at all. They include snails and slugs.

Snails and slugs
Image of Nudibranchs
Order

Nudibranchs

Nudibranchia

145M years ago

Nudibranchs are an order of soft-bodied marine gastropod mollusks that shed their shells after their larval stage. They are noted for their often extraordinary colours and striking forms.

Image of Land snails and slugs
Informal

Land snails and slugs

Pulmonata

150M years ago

Pulmonata is an informal group of gastropods that includes most land snails and slugs (primarily the order Stylommatophora), as well as some freshwater snails. They are distinguished by having a lung-like sac instead of gills.

Image of Sea snails
Subclass

Sea snails

Vetigastropoda

500M years ago

Vetigastropoda is a subclass of marine gastropod mollusks that form a very ancient lineage, and are considered to be among the most primitive living gastropods. They are distributed in all oceans of the world from the deep sea to intertidal zones.

Image of Clams and bivalves
Class

Clams and bivalves

Bivalvia

510M years ago

Bivalves have two hinged shells and include clams, oysters, and mussels.

Clams and bivalves
Image of True oysters
Order

True oysters

Ostreida

252M years ago

This order includes the true oysters, which are filter-feeding bivalves that are often found in brackish, marine habitats. Many species are cultured for their edible flesh.

Image of Mussels
Order

Mussels

Mytilida

400M years ago

Mytilida comprises several families of saltwater and freshwater mussels. They are characterized by their elongated, asymmetrical shells and strong byssal threads for attachment.

Image of Scallops and allies
Order

Scallops and allies

Pectinida

400M years ago

This order includes the scallops, which are known for their fan-shaped shells and their ability to swim by rapidly opening and closing their shells.

Image of Cephalopods
Class

Cephalopods

Cephalopoda

500M years ago

Cephalopods are mollusks with large heads and tentacles, including octopuses, squids, and cuttlefish.

Cephalopods
Image of Octopuses
Order

Octopuses

Octopoda

164M years ago

Members of the order Octopoda have eight arms and no shell. They are known for their intelligence and ability to change color and texture.

Image of Squids
Informal

Squids

Teuthida

300M years ago

Squid are an informal group of marine cephalopods with ten arms and tentacles. They are strong swimmers and have an internal shell.

Image of Cuttlefish
Order

Cuttlefish

Sepiida

150M years ago

Cuttlefish are marine mollusks of the order Sepiida. They have a unique internal shell, the cuttlebone.

Image of Echinoderms
Phylum

Echinoderms

Echinodermata

540M years ago

Echinoderms are marine animals with radial symmetry and include sea stars, sea urchins, and sea cucumbers.

Echinoderms
Image of Sea stars
Class

Sea stars

Asteroidea

450M years ago

Sea stars are star-shaped echinoderms that typically have five or more arms.

Image of Sea urchins and sand dollars
Class

Sea urchins and sand dollars

Echinoidea

450M years ago

Echinoids include sea urchins and sand dollars, characterized by their spiny or flattened shells.

Image of Sea cucumbers
Class

Sea cucumbers

Holothuroidea

400M years ago

Sea cucumbers are elongated echinoderms that live on the ocean floor and have a soft, leathery body.

Image of Sponges
Phylum

Sponges

Porifera

600M years ago

Sponges are simple, porous animals that filter water to obtain food. They are mostly marine organisms.

Image of Cnidarians
Phylum

Cnidarians

Cnidaria

580M years ago

Cnidarians have radial symmetry and include jellyfish, corals, and sea anemones. They have specialized cells for capturing prey.

Cnidarians
Image of True jellyfish
Class

True jellyfish

Scyphozoa

505M years ago

Scyphozoans are the large, free-swimming jellyfish typically seen in the ocean.

Image of Corals and sea anemones
Class

Corals and sea anemones

Anthozoa

541M years ago

Anthozoans are mostly sessile cnidarians, including corals and sea anemones, which live attached to surfaces.

Image of Segmented worms
Phylum

Segmented worms

Annelida

518M years ago

Annelids are segmented worms, including earthworms and leeches, with bodies divided into ring-like segments.

Segmented worms
Image of Bristle worms
Class

Bristle worms

Polychaeta

505M years ago

A class of marine annelid worms, generally characterized by a pair of paddle-like and bristle-bearing appendages on each segment.

Image of Clitellates
Class

Clitellates

Clitellata

300M years ago

This class of annelid worms is characterized by having a 'clitellum' - a collar that forms a reproductive cocoon. It includes earthworms and leeches.

Clitellates
Image of Earthworms
Subclass

Earthworms

Oligochaeta

300M years ago

This subclass includes terrestrial and aquatic worms, most notably the earthworms. They play a crucial role in soil aeration and fertility.

Image of Leeches
Subclass

Leeches

Hirudinea

250M years ago

This subclass comprises leeches, which are known for their segmented bodies and suckers at both ends. Many are blood-sucking parasites.

Image of Plants
Kingdom

Plants

Plantae

1.6B years ago

Plants are eukaryotic, multicellular and autotrophic organisms. The plant cell contains a rigid cell wall.

Plants
Image of Red algae
Phylum

Red algae

Rhodophyta

1.2B years ago

Rhodophyta, or red algae, are one of the oldest groups of eukaryotic algae, primarily found in marine habitats. They contain phycoerythrin, which gives them their characteristic red color.

Image of Green algae
Phylum

Green algae

Chlorophyta

1.2B years ago

Chlorophyta is a phylum of green algae. They are a diverse group of photosynthetic eukaryotes that are common in freshwater and marine environments.

Image of Mosses
Phylum

Mosses

Bryophyta

470M years ago

Bryophytes are non-vascular plants, which typically grow in moist environments. They are known as mosses.

Image of Vascular plants
Phylum

Vascular plants

Tracheophyta

425M years ago

Plants that have lignified tissues for conducting water and minerals throughout the plant. The group includes most land plants: clubmosses, horsetails, ferns, gymnosperms (including conifers), and angiosperms (flowering plants).

Vascular plants
Image of Ferns
Class

Ferns

Polypodiopsida

360M years ago

Ferns are non-flowering vascular plants that reproduce via spores and have large, divided leaves called fronds.

Image of Pines and other conifers
Class

Pines and other conifers

Pinopsida

300M years ago

Pinopsida includes pines and other conifers with needle-like leaves and woody cones. They are gymnosperms.

Image of Monocots
Class

Monocots

Liliopsida

134M years ago

Monocots are flowering plants (angiosperms) with a single seed leaf (cotyledon) and include grasses, lilies, and orchids.

Monocots
Image of Grasses, sedges, and allies
Order

Grasses, sedges, and allies

Poales

115M years ago

An order of flowering plants in the monocots, which includes the economically important grass family (Poaceae) and other grass-like families.

Image of Lilies and allies
Order

Lilies and allies

Liliales

122M years ago

Liliales is an order of monocotyledonous flowering plants that includes many well-known ornamental plants like lilies and tulips. This order consists mostly of herbaceous plants, but also includes some climbers and shrubs. They are predominantly perennial plants with food storage organs like bulbs or rhizomes.

Image of Asparagus, orchids, and allies
Order

Asparagus, orchids, and allies

Asparagales

125M years ago

Asparagales is a diverse and large order of monocotyledonous flowering plants. It includes a wide variety of species, from herbaceous perennials to climbers, trees, and shrubs. Many species are geophytes, possessing bulbs, corms, or tubers. Economically important plants in this order include asparagus, onions, garlic, and ornamental flowers like orchids, daffodils, and irises.

Image of Water plantains and allies
Order

Water plantains and allies

Alismatales

134M years ago

Alismatales is an order of flowering plants that are primarily tropical or aquatic. This order, sometimes referred to as the arrowhead and pondweed order, includes about 4,500 species. Plants in this order can be found in both freshwater and marine environments.

Image of Dicots
Class

Dicots

Magnoliopsida

135M years ago

Dicots are a class of flowering plants (angiosperms) with two seed leaves (cotyledons) and usually have broad leaves.

Dicots
Image of Roses, strawberries, and allies
Order

Roses, strawberries, and allies

Rosales

90M years ago

A large order of diverse flowering plants which includes the rose family (Rosaceae). It contains herbs, shrubs, and trees, many of which are of great economic importance.

Image of Carrots, celery, and allies
Order

Carrots, celery, and allies

Apiales

93M years ago

Apiales is an order of flowering plants that includes carrots, celery, coriander, parsley, and ginseng. Many members have aromatic foliage and produce umbels of flowers.

Image of Daisies, sunflowers, and allies
Order

Daisies, sunflowers, and allies

Asterales

82M years ago

Asterales is an order of flowering plants that includes daisies, sunflowers, and lettuce. It is one of the largest and most diverse orders of dicots.

Image of Borage, forget-me-nots, and allies
Order

Borage, forget-me-nots, and allies

Boraginales

83M years ago

Boraginales is an order of flowering plants that includes borage and forget-me-nots. They are often characterized by hairy foliage and coiled clusters of flowers.

Image of Cabbages, mustards, and allies
Order

Cabbages, mustards, and allies

Brassicales

103M years ago

The Brassicales are an order of flowering plants that includes well-known members like cabbage, cauliflower, broccoli, and mustard. A common characteristic of many plants in this order is the production of glucosinolate compounds, also known as mustard oils.

Image of Carnations, cacti, and allies
Order

Carnations, cacti, and allies

Caryophyllales

124M years ago

Caryophyllales is an order of flowering plants that includes carnations, cacti, and spinach. They are a diverse group adapted to a wide range of habitats.

Image of Blueberries, azaleas, and allies
Order

Blueberries, azaleas, and allies

Ericales

110M years ago

Ericales is a large and diverse order of flowering plants that includes blueberries, cranberries, and azaleas. Many species are adapted to acidic soils.

Image of Beans, peas, and allies
Order

Beans, peas, and allies

Fabales

94M years ago

Fabales is an order of flowering plants that includes the legume family (Fabaceae), milkworts (Polygalaceae), and others. This order is economically important as a source of food and contains a vast diversity of species.

Image of Beeches, oaks, and allies
Order

Beeches, oaks, and allies

Fagales

100M years ago

Fagales is an order of flowering plants that includes beeches, oaks, and birches. They are mostly wind-pollinated trees and shrubs.

Image of Coffee, gentians, and allies
Order

Coffee, gentians, and allies

Gentianales

81M years ago

Gentianales is an order of flowering plants that comprises over 20,000 species across 5 families. Many of these plants are used in traditional medicine and are known to contain toxic compounds. Well-known members include coffee, gardenia, and oleander.

Image of Mints, lavenders, and allies
Order

Mints, lavenders, and allies

Lamiales

102M years ago

The Lamiales, also known as the mint order, are a large order of flowering plants with over 23,000 species found worldwide. They are often characterized by square stems and aromatic leaves and include well-known culinary herbs like mint, basil, and rosemary.

Image of Willows, violets, and allies
Order

Willows, violets, and allies

Malpighiales

109M years ago

Malpighiales is a large and diverse order of flowering plants that includes willows, violets, and passionflowers. It is one of the largest orders of eudicots.

Image of Cotton, cacao, and allies
Order

Cotton, cacao, and allies

Malvales

100M years ago

Malvales is an order of flowering plants that includes cotton, cacao, and hibiscus. Many members have mucilaginous sap.

Image of Myrtles, eucalypts, and allies
Order

Myrtles, eucalypts, and allies

Myrtales

99M years ago

The Myrtales are an order of flowering plants that includes well-known species such as myrtle, eucalyptus, and guava. This order is primarily found in tropical and warmer regions and is characterized by the presence of a hypanthium, a cup-like structure that supports the floral organs.

Image of Buttercups, poppies, and allies
Order

Buttercups, poppies, and allies

Ranunculales

125M years ago

Ranunculales is an order of flowering plants that includes the buttercup family (Ranunculaceae). This order contains a wide variety of plants, from herbs and vines to shrubs, which are found in diverse habitats across the globe.

Image of Maples, cashews, and allies
Order

Maples, cashews, and allies

Sapindales

95M years ago

Sapindales is an order of flowering plants that includes maples, cashews, and citrus fruits. Many species are economically important for their wood and fruit.

Image of Stonecrops, saxifrages, and allies
Order

Stonecrops, saxifrages, and allies

Saxifragales

120M years ago

Saxifragales is an order of flowering plants that includes stonecrops, saxifrages, and witch hazels. It is a morphologically diverse group.

Image of Potatoes, tomatoes, and allies
Order

Potatoes, tomatoes, and allies

Solanales

83M years ago

Solanales is an order of flowering plants that includes potatoes, tomatoes, and petunias. Many members produce alkaloids, some of which are toxic.

Image of Grapevines and allies
Order

Grapevines and allies

Vitales

99M years ago

Vitales is an order of flowering plants that contains the grapevine family. They are primarily woody vines with tendrils for climbing.

Image of Fungi
Kingdom

Fungi

Fungi

1.5B years ago

Fungi are eukaryotic organisms that include microorganisms such as yeasts, moulds and mushrooms. They are classified as heterotrophs and have a cell wall.

Fungi
Image of Club fungi
Phylum

Club fungi

Basidiomycota

570M years ago

Club fungi include mushrooms and toadstools, which produce spores on specialized structures called basidia.

Image of Zygote fungi
Phylum

Zygote fungi

Zygomycota

1B years ago

Zygote fungi include molds and are characterized by their production of zygospores during sexual reproduction.

Image of Sac fungi
Phylum

Sac fungi

Ascomycota

570M years ago

Sac fungi produce spores in sac-like structures called asci. This group includes yeasts, molds, and morels.

Sac fungi
Image of Lichenized fungi
Class

Lichenized fungi

Lecanoromycetes

400M years ago

The largest class of lichen-forming fungi. A lichen is a composite organism that arises from algae or cyanobacteria living among filaments of multiple fungi species in a mutualistic relationship.

Image of Chromists
Kingdom

Chromists

Chromista

1B years ago

A kingdom of eukaryotic organisms, including many types of algae and other protists. Many are photosynthetic. Many chromists acquired photosynthesis through secondary endosymbiosis, by engulfing a red alga.

Chromists
Image of Ochrophytes
Phylum

Ochrophytes

Ochrophyta

900M years ago

A major group of heterokonts, including a wide range of algae from giant kelp to single-celled diatoms.

Ochrophytes
Image of Brown algae
Class

Brown algae

Phaeophyceae

150M years ago

Commonly known as brown algae, this class includes many large, multicellular marine seaweeds, such as kelp.

Image of Diatoms
Clade

Diatoms

Diatomeae

200M years ago

Diatoms are a major group of microalgae, and are among the most common types of phytoplankton. They are enclosed within a cell wall made of silica called a frustule. Living diatoms make up a significant portion of Earth's biomass. They generate about 20 to 50 percent of the oxygen produced on the planet each year.

Image of Bacteria
Domain

Bacteria

Bacteria

3.5B years ago

Bacteria are a domain of prokaryotic microorganisms. They are ubiquitous, found in almost every habitat on Earth. While some bacteria are pathogenic, most are harmless or beneficial, playing crucial roles in ecosystems. There are 6 kingdoms and 89 recognized phyla of bacteria.

Image of Gram-positive bacteria
Kingdom

Gram-positive bacteria

Bacillati

3B years ago

Bacillati (or Terrabacteria) is a major clade of bacteria, thought to have adapted to life on land. It includes many Gram-positive bacteria as well as the photosynthetic Cyanobacteria.

Gram-positive bacteria
Image of Cyanobacteria
Phylum

Cyanobacteria

Cyanobacteriota

2.7B years ago

A phylum of photosynthetic bacteria, also known as blue-green algae. They are responsible for the oxygenation of Earth's atmosphere.

Image of Bacillota
Phylum

Bacillota

Bacillota

3B years ago

Bacillota includes well-known groups like Bacillus and Clostridium. Many Bacillota produce endospores, which are resistant to desiccation and can survive extreme conditions.

Image of Actinomycetota
Phylum

Actinomycetota

Actinomycetota

2.5B years ago

Actinomycetota are a phylum of Gram-positive bacteria known for their filamentous, fungus-like growth and for producing many important antibiotics. In soil they help to decompose the organic matter of dead organisms so the molecules can be taken up anew by plants.

Image of Gram-negative bacteria
Kingdom

Gram-negative bacteria

Gracilicutes

3B years ago

Gracilicutes is a major clade of bacteria characterized by a diderm (double-membrane) cell envelope, corresponding to most Gram-negative bacteria. This group exhibits incredible metabolic diversity.

Gram-negative bacteria
Image of Pseudomonadota
Phylum

Pseudomonadota

Pseudomonadota

3.2B years ago

Pseudomonadota (formerly Proteobacteria) is a major phylum of Gram-negative bacteria with enormous metabolic and ecological diversity. It includes many pathogens (like Salmonella and E. coli), nitrogen-fixing bacteria, and the ancestors of mitochondria.

Image of Spirochetes
Phylum

Spirochetes

Spirochaetota

2.5B years ago

Spirochaetota is a phylum of diderm bacteria, characterized by their long, helically coiled (spiral-shaped) cells. They are known for the distinctive corkscrew-like movement.

Image of Archaea
Domain

Archaea

Archaea

3.5B years ago

Archaea are a domain of single-celled organisms. These microbes are prokaryotes, meaning they have no cell nucleus. Archaea were initially classified as bacteria, but have a distinct evolutionary history and are now recognized as a separate domain.

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