| All images and text according to Aids to the Recognition of Fresh-Water Algae, Invertebrates, and Fishes |
Physarum
length µ variable, a true slime mold; amoeba-like cells fuse to form multinucleate plasmodium followed by stalk sporangia. |
Dictyostelium
length µ variable, a cellular slime mold; cells of plasmodium distinct, developing into a single sporangium. |
Prorodon
length 30-130 µ, a typical, primitive ciliate. |
Coleps
length 50-110 µ, many species, characteristic plates covering the body. |
Lacrymaria
length 500-1,200 µ, Anterior end extensible and highly flexible. |
Dileptus
length 250-500 µ, many species; with neck-like extension of the body. |
Chilodonella
length 50-150 µ, common surface scum of stagnant pools. Also see, Chilodonella and it's role as a parasitic protozoan. |
Didinium
length 80-200 µ, predacious on Paramecium. |
Colpoda
length 40-110 µ, in stagnant pools among decaying vegetation. |
Paramecium
length 100-350 µ, many species, very common. See this entry, on Paramecium with photographs and videos. |
Frontonia
length 150-600 µ, among filamentous algae. |
Urocentrum
length 50-80 µ, among pond vegetation. |
Blepharisma
length 80-200 µ, often pinkish in color; in decaying vegetation. |
Spirostomum
length 1000-3000 µ, one of the largest protozoans, highly contractile. |
Stentor
length 1000-2000 µ, attached or free-swimming; trumpet-like in shape. |
Metopus
length 90-140 µ, in decaying vegetation. |
Oxytricha
length 50-250 µ, with marginal rows of cirri. |
Euplotes
length 90 µ, with isolated groups of compound cilia (cirri). |
Urostyla
length 200-600 µ, many species; numerous rows of cirri. |
Halteria
length 25-50 µ, performs bouncing movements. Common in pond water infusions. |
Condonella
length 60-70 µ, body pot-shaped, sharply divided into collar and bowl; collar without spiral structure. |
Vorticella
length 135-150 µ, attaches to substrate by contractile stalk; with free swimming stage. See Vorticella on its role as a parasitic protozoa. |
Cothurnia
length 70-100 µ, often in gills of crayfish. Attaches to substrate by short stalk. |
Epistylis
length 50-250 µ, colony of many individuals united in a multistalk, not contractile; same species occurs on crayfishes and turtles. See Epistylis for its role as a parasitic protozoa. |
Zoothamnium
length 250 µ, colony of many individuals united in a common stalk; contracts as unit; colonies several mm high. See Zoothamnium for its role as a parasitic protozoan. |
Podophyra
length 10-100 µ, with sucking tentacles, stalked; close to Tokophyra. |
Tokophyra
length 50-175 µ, with free swimming ciliated young; adult stalked, non-ciliated, and bears sucking tentacles. |
Loxodes
length 700 µ, strongly compressed. Brownish. |
Carchesium
length 100-125 µ, many species; forms stalked colonies in which individuals contract separately; some are attached to plants and animals. |
Stylonchia
length 100-300 µ, many species. |
Ichthyophthirius
length 100-1000 µ, causes "white-spot" or "Ich" disease of fish in aquaria and fish hatcheries. |
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