- Classification Systems - (viruses mentioned) - Biodiversity List/Contents | Graphical Tree
- Classification Criteria
- Phylogeny
- NCBI Database
- Viruses
- Prokaryotes - Archaea and Bacteria
- Description
- Classification
- Bacteria
- Cyanobacteria
- Proteobacteria
- Gram-Positive Bacteria
- Archaea
- Eukaryota
- Description
- Classification
- Amoebae
- Flagellates
- Alveolata
- Algae (including Rhodophyta)
- stramenopiles
- Fungi/Metazoa Group
- Viridiplantae - Green Algae, Stoneworts, Zygnemophyta
- Description
- Classification
- Chlorophyta - Green Algae
- Streptophyta - Stoneworts, Desmids, etc.
- Embryophyta
- Description
- Classification
- Anthocerotophyta - Hornworts
- Marchantiophyta - Liverworts
- Bryophyta - Mosses
- Tracheophyta
- Description
- Classification
- Lycopodiophyta - Club Mosses, Spike Mosses, Quillworts
- Equisetophyta - Horsetails
- Psilotophyta - Whisk Ferns
- Filicophyta - Ferns
- Spermatophyta
- Description
- Classification
- Ginkgophyta - Ginkgo biloba
- Gnetophyta - Joint Firs
- Cycadophyta - Cycads
- Coniferophyta - Conifers
- Magnoliophyta - Flowering Plants
- Description
- Classification
- Basal Lineages
- Liliopsida
- Eudicots
- asterids
- rosids
- Fungi - Molds, Chytrids, Sac Fungi, Club Fungi
- Description
- Classification
- Microfungi
- Ascomycota
- Basidiomycota - Mushrooms, Puffballs, etc.
- Lichens
- Metazoa
- Description
- Classification
- Myxozoa and Placozoa
- Mesozoa
- Porifera - Sponges
- Eumetazoa
- Description
- Classification
- Cnidaria - Corals, Jellyfish
- Ctenophora - Comb Jellies
- Bilateria
- Description
- Classification
- Acoelomata - Flatworms (Platyhelminthes)
- Pseudocoelomata - Roundworms, Rotifers, etc.
- Coelomata
- Description
- Classification
- Miscellaneous Coelomates - Lampshells, Bryozoans, Spoonworms, Ribbon Worms
- Annelida - Segmented Worms
- Mollusca - Clams, Octopi, Snails
- Panarthropoda - Velvet Worms, Tardigrades
- Arthropoda
- Description
- Classification
- Chelicerata - Spiders, Scorpions, Ticks, Horseshoe Crabs
- Mandibulata - Centipedes, Millipedes
- Pancrustacea - Crustaceans
- Hexapoda - Springtails
- Insecta - Insects
- Description
- Classification
- Archaeognatha & Thysanura - Bristletails, Silverfish, Firebrats
- Pterygota - Dragonflies, Damselflies, Mayflies
- Neoptera - Stoneflies, Web Spinners
- Orthopteroidea - Walking Sticks, Mantids, Cockroaches, Termites, Earwigs
- Orthoptera - Grasshoppers, Locusts, Crickets, Katydids
- Paraneoptera - Lice, Cicadas, Aphids, True Bugs
- Endopterygota - Ant Lions, Fleas, Scorpionflies, Dobsonflies
- Diptera - Flies, Mosquitos
- Hymenoptera - Ants, Bees, Wasps
- Amphiesmenoptera - Butterflies, Moths, Caddisflies
- Coleoptera - Beetles
- Deuterostomia
- Description
- Classification
- Chaetognatha - Arrow Worms
- Echinodermata - Starfishes, Sea Urchins, Sea Cucumbers
- Hemichordata - Acorn Worms
- Chordata
- Description
- Classification
- Urochordata - Tunicates
- Cephalochordata - Lancelets
- Craniata - Hagfishes
- Vertebrata
- Description
- Classification
- Petromyzontiformes - Lampreys
- Chondrichthyes - Cartilaginous Fishes (Sharks, Rays)
- Teleostomi - Ray-Finned Fishes, Coelacanths, Lungfishes
- Description
- Classification
- Actinopterygii - Bichirs, Sturgeons
- Neopterygii - Bowfins, Gars
- Teleostei - Catfishes, Eels, Others
- Euteleostei - Salmons, Pikes
- Neoteleostei - Lightfishes, Green Eyes, Lanternfishes
- Acanthomorpha - Cods, Anglerfishes, Toadfishes, Opahs
- Acanthopterygii - Dories, Roughies, Whalefishes
- Percomorpha - Perches, Angelfishes, Flounders, Puffers
- Smegmamorpha - Mullets, Flying Fishes, Rainbowfishes, Livebearers
- Sarcopterygii - Coelocanths, Lungfishes, Tetrapods
- Tetrapoda - Amphibians
- Description
- Classification
- Gymnophiona - Caecilians
- Caudata - Salamanders, Newts
- Anura - Frogs, Toads
- Sauropsida, , Lizards, Snakes, Crocodiles
- Description
- Classification
- Testudines - Turtles
- Lepidosauria - Beaked Reptiles, Iguanas, Anoles, Chameleons
- Scleroglossa - Lizards, Geckos, Skinks
- Serpentes - Snakes
- Crocodylidae - Crocodiles, Alligators, Caimen
- Aves - Birds
- Description
- Classification
- Palaeognathae
- Neognathae I
- Neognathae II
- Neognathae III
- Neognathae IV
- Neognathae V
- Falconiformes and Strigiformes
- Passeriformes
- Mammalia - Mammals
- Description
- Classification
- Monotremata
- Metatheria
- Edentata and Pholidota
- Macroscelidea, Rodentia, Lagomorpha and Insectivora
- Tubulidentata, Perissodactyla, Hyracoidea, Proboscidea and Sirenia
- Cetartiodactyla
- Carnivora
- Chiroptera and Dermoptera
- Primates and Scandentia
- Hominidae
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