A six-kingdom system of classification of organisms is used today.Two kingdoms—Kingdom Archaebacteria and Kingdom Eubacteria—contain organisms that do not have a nucleus and that lack membrane-bound structures in the cytoplasm of their cells.The members of the other four kingdoms have a cell or cells that contain a nucleus and structures in the cytoplasm, some of which are surrounded by membranes.These kingdoms are Kingdom Protista, Kingdom Fungi, Kingdom Plantae,and Kingdom Animalia.
Kingdom Archaebacteria one-celled; some absorb food from their surroundings; some are photosynthetic; some are chemosynthetic; many are found in extremely harsh environments including salt ponds, hot springs, swamps,and deep-sea hydrothermal vents
Kingdom Eubacteria one-celled; most absorb food from their surroundings; some are photosynthetic; some are chemosynthetic; many are parasites; many are round, spiral, or rod-shaped; some form colonies
Phylum Euglenophyta one-celled;photo-synthetic or take in food; most have one flagel-lum; euglenoids
Phylum Bacillariophyta one-celled; photosynthetic; have unique double shells made of silica; diatoms
Phylum Dinoflagellata one-celled; photosynthetic; contain red pigments; have two flagella; dinoflagellates
Phylum Chlorophyta one-celled,many-celled, or colonies; photosynthetic; contain chlorophyll; live on land, in freshwater, or salt water; green algae
Phylum Rhodophyta most are many-celled; photosynthetic; contain red pigments; most live in deep, saltwater environments; red algae
Phylum Phaeophyta most are many-celled; photosynthetic; contain brown pigments; most live in saltwater environments; brown algae
Phylum Rhizopoda one-celled; take in food; are free-living or parasitic; move by means of pseudopods; amoebas
REFERENCE HANDBOOKS E ♦ 191
¿ssel, (c)NIBSC/Science Photo Library/Photo Researchers, (r)David John/Visuals Unlimited
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