Protists (IPA: ) are a heterogeneous group of living things, comprising those eukaryotes that are not animals, plants, or fungi. They are usually treated as the kingdom Protista or Protoctista. The protists are a paraphyletic grade, rather than a natural (monophyletic) group, and do not have much in common besides a relatively simple organization (unicellular, or multicellular without highly specialized tissues). Some call it the "left-overs" from the other eukaryotic kingdoms.
Protists were traditionally (for the last 150 years) subdivided into several groups based on similarities to the higher kingdoms: the animal-like protozoa, the plant-like algae, and the fungi-like slime moulds and water moulds. These groups often overlap, and have been replaced by phylogenetic classifications. However, they are still useful as informal groups for describing the morphology and ecology of protists.
More on [ Protist ]
Phycology :: Botany
Protists :: Eukaryotic
Protistology :: Microbiology
Micropaleontology :: Paleontology

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Algae of the Keweenaw - Large image gallery of freshwater algae from the Keweenaw Peninsula, Michigan.
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.
Caribbean Reef Plants - Sample pages and images from an identification guide to marine algae and seagrasses.
Meta Description: [ Richly illustrated identification field guides from OffShore Graphics: 1) Waterways & Byways of the Indian River Lagoon - a field guide for boaters, anglers and naturalists; 2) South Pacific Reef Plants and 3) Caribbean Reef Plants. 'User-friendly' field guides to coral reef plants (algae and ... ]
Droplet - Microscopy of the protozoa by Piotr Rotkiewicz - includes images, systematics, glossary, forum, and resources.
Freakin Fucus - Introduction and technical information regarding seaweeds and phycology.
Meta Description: [ Introduction and indepth technical information regarding the wonderful and exciting world of seaweeds and related marine plants. ]
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.
Kingdom Protista - An interactive phylogenetic tree with information about the major groups of protists.
Meta Description: [ Sidwell Friends School (SFS) is a PK-12, co-educational Quaker day school with campuses in Washington, DC and Bethesda, MD. Founded in 1883, the School is a non-profit, tax-exempt institution governed by an independent Board of Trustees. ]
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Kingdom Protista - Brief introduction, from courseware for Introductory Biology courses at the University of Southern Mississippi.
Meta Description: [ This page is part of a website designed by Gary Anderson (University of Southern Mississippi) ]
Kingdom Protoctista - Introductory look at the Kingdom.
Natural Perspective: The Protoctist Kingdom (Protoctista) - Describes the kingdom as a catch-all for the multicellular organisms which don't fit into the Animal, Plant, or Fungus Kingdoms and describes its scope.
Parasitic Protozoa - Overview of the one-fifth of protozoan species that are parasitic.
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Photos of Algae - Images of about 20 genera from the El Eden Ecological Reserve, Mexico.
Protist Image Data - Pictures and information on selected genera of algae and protozoa.
Protist Information Server - Image database archiving more than 34,000 images (511 genera, 1944 species) and 556 movie clips for research and education.
Meta Description: [ Databases consisting of many protist images collected from field, digital specimen archives ]
Protistan Phyla - Short articles and illustrations of the major groups of protists.
Seaweed Site - Algae-L discussion list, book list, comprehensive information, and photographs.
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.
World of Algae - Basic information and links to resources about algae.
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