Biology Taxonomy: Domains, Kingdoms, Phyla, and Classes

Domain Eukarya

cells with nucleus and membrane-bound organelles

Supergroup Archaeaplastida

photosynthetic organisms with chloroplasts

Kingdom Plantae

multicellular, cellulose cell walls, photosynthesis

Phylum Hepaticophyta

liverworts, nonvascular

Phylum Anthocerotophyta

hornworts, nonvascular

Phylum Bryophyta

mosses, nonvascular

Phylum Lycophyta

club mosses, vascular seedless

Phylum Equisetophyta

horsetails, vascular, silica stems

Phylum Psilotophyta

whisk ferns, no true roots or leaves

Phylum Polypodiophyta

ferns, vascular, seedless

Phylum Pinophyta

conifers, gymnosperms

Phylum Cycadophyta

cycads, gymnosperms

Phylum Ginkgophyta

ginkgos, gymnosperms

Phylum Gnetophyta

gnetophytes, gymnosperms

Phylum Anthophyta

angiosperms, flowering plants

Monocotyledones

Phylum Anthophyta, one cotyledon

Eudicotyledones

Phylum Anthophyta, two cotyledons

Supergroup Opisthokonta

includes animals and fungi

Kingdom Animalia

multicellular, heterotrophic

Phylum Porifera

sponges, no true tissues

Phylum Ctenophora

comb jellies, cilia

Phylum Cnidaria

radial symmetry, stinging cells

Class Scyphozoa

Phylum Cnidaria, true jellyfish

Class Cubozoa

Phylum Cnidaria, box jellyfish

Class Hydrozoa

Phylum Cnidaria, hydra, man o' war

Class Anthozoa

Phylum Cnidaria, coral, sea anemones

Phylum Platyhelminthes

flatworms, acoelomate

Class Turbellaria

Phylum Platyhelminthes, free living

Class Trematoda

Phylum Platyhelminthes, flukes

Class Cestoda

Phylum Platyhelminthes, tapeworms

Phylum Nematoda

roundworms, pseudocoelom

Phylum Rotifera

rotifers, microscopic

Phylum Annelida

segmented worms

Class Polychaeta

Phylum Annelida, marine bristle worms

Class Clitellata

Phylum Annelida, clitellum present

Subclass Oligochaeta

Phylum Annelida, earthworms

Subclass Hirudinea

Phylum Annelida, leeches

Phylum Mollusca

soft body, mantle

Class Gastropoda

Phylum Mollusca, snails, slugs

Class Bivalvia

Phylum Mollusca, clams, oysters

Class Cephalopoda

Phylum Mollusca, octopus, squid

Phylum Arthropoda

exoskeleton, jointed appendages, molting

Subphylum Trilobitamorpha

Phylum Arthropoda, extinct

Class Trilobita

Subphylum Trilobitamorpha, fossil arthropods

Subphylum Chelicerata

Phylum Arthropoda, no antennae

Class Xiphosura

Subphylum Chelicerata, horseshoe crabs

Class Arachnida

Subphylum Chelicerata, spiders, ticks, scorpions

Subphylum Crustacea

Phylum Arthropoda, aquatic, two antennae

Subphylum Myriapoda

Phylum Arthropoda, many legs

Class Chilopoda

Subphylum Myriapoda, centipedes

Class Diplopoda

Subphylum Myriapoda, millipedes

Subphylum Hexapoda

Phylum Arthropoda, six legs

Class Insecta

Subphylum Hexapoda, insects

Phylum Echinodermata

radial adults, water vascular system

Class Asteroidea

Phylum Echinodermata, starfish

Class Ophiuroidea

Phylum Echinodermata, brittle stars

Class Echinoidea

Phylum Echinodermata, sea urchins, sand dollars

Class Holothuroidea

Phylum Echinodermata, sea cucumbers

Class Crinoidea

Phylum Echinodermata, feather stars