The Kingdom-level grouping known as Protista or Protoctistae consists mainly of microscopic organisms. It is defined by exclusion: its members are neither animals (which develop from a blastula), plants (which develop from an embryo), fungi (which lack undulipodia and develop from spores), nor prokaryotes. It includes the green algae (Gamophyta and Chlorophyta), red algae (Rhodophyta), brown algae (Phaeophyta), diatoms (Bacillariophyta), and other groups. Different authorities have differing views on the taxonomy of these organisms.
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- AlgaeBase Information on the algae of the world, including terrestrial, marine, and freshwater forms. Search by genus, species, or common name. Includes images and references.
- Seaweed Site Information on many aspects of seaweeds with links to other sites connected with these algae.
- Introduction to the Chromista: From Microbes to Giants General discussion of the kingdom-level taxon Chromista, including diatoms, kelp, downy mildew, and other organisms that possess chlorophyll and are mostly photosynthetic, but are not plants. Includes links for more information.
- Protistan Phyla Short articles and illustrations of the major groups of protists.
- Protist Image Data Pictures and information on selected genera of algae and protozoa.
- Freakin Fucus Introduction and technical information regarding seaweeds and phycology.
- Protist Information Server Image database archiving more than 34,000 images (511 genera, 1944 species) and 556 movie clips for research and education.
- Droplet Microscopy of the protozoa by Piotr Rotkiewicz - includes images, systematics, glossary, forum, and resources.
- Just what is this Stuff we call Algae? Information on the freshwater algae likely to be found in a garden pond.
- Algae Description and Types Algae are plant-like organisms that are usually photosynthetic and aquatic and this article describes the main phylogenetic groups.
- Flagellate Information from Wikipedia on these unicellular organisms with one or more whip-like organelles called flagella. Although sharing this common structure, they are not a single taxonomic group.
- Protist Information from Wikipedia on this group of organisms which cannot be classified as plants, animals or fungi.
- Acritarchs and Chitinozoa Information on these organisms which have not yet been able to be classified, including their fossil record, biology and life cycle with a number of images of individual species.
- Freshwater Algae Provides information on the varieties of algae and their classification with photomicrographs of example species of the main freshwater phyla.
- Introduction to the Sagenista Information on the bicoecids and slime nets which form a basal group of chromists, the classification of which is unclear.
- Marine Algae of Northern California About 16 photographs of species found in this region.
- Flagellated Protozoa Article by Wim van Egmond introducing these organisms with photographs of Euglena, Peranema, Dinoflagellates and Spongomonas, and instructions on growing your own cultures.
- Marine Protozoa Article by Jean-Marie Cavanihac on these organisms with photographs of many species.
- Marine Collection Small photograph gallery of microscopic algae, phytoplankton and diatoms.
- Protozoa Article from Wikipedia on the unicellular microbes that are traditionally classified as protozoans, based on their methods of locomotion.
- Protist Images: Heterokonta Classification of these flagellates with a number of images of individual species. English and Japanese.
- Algae A basic guide to algae including marine, freshwater and land species.
- The Center for Phycological Documentation Information about algae and their taxonomy, including 'The Catalogue of the Benthic Marine Algae of the Indian Ocean,' and 'The Index Nominum Algarum,' a compendium of circa 200,000 algal names.
- Ohio University: Algae Provides a directory of algal images and links to general information on algae.