1. Amoeba

2. Paramecium

3. Blepharisma
The Blepharisma is a common ciliate found in most any pond. It is similar in size and shape to the Paramecium, but displays an unusual characteristic, albeit a potentially fatal one. It is easily spotted because, unlike most of its community pond inhabitants, it is not transparent, but rather a striking pink color under normal conditions. When exposed to an intense artificial light, such as that from a micro-projector, the pink pigment emits a poisonous toxin that completely disintegrates the creature.

4. Euglena

5. Stentor
The green color tone in this pair is probably due to the presence of symbiotic green algae

6. Colpidium
Eats bacteria
ebiomedia.com/gall/ micronat/Colpidium.html

7. Vorticella

8. Chilomonas
Chilomonas are very common and are one of the chief food sources for larger protozoans, especially Amoeba proteus.

9. Didinium
The Didinium is a protozoa that feeds exclusively on Paramecia. If a culture of Paramecia is innoculated with just two Didinium, the Didinium will wipe out the colony of Paramecia in just a few days, regardless of how large the culture is. It takes about one minute for the Didinium to consume a Paramecium, after which it moves on to consume another - sort of non-stop gluttony. The more they eat, the bigger they get, and the bigger they get the sooner they split into more of themselves. The Paramecia don't have a chance.

10. Volvox

11. Spirostomum
…Can grow to to a size of more than 4 millimetres. It can therefore be seen without the help of a microscope. When observed swimming in a little jar of pond water it looks like a little worm. The organism can contract it's body to 1/4 of it's length in 6-8 millisec which is the fastest contraction known in any living cell. …Feeds on bacteria. Like many large single celled organisms (giant amoebas, or Stentor: the trumpet animalcule) it has not one nucleus but many. The nucleii form a long strand, like a string of pearls.

12. Pond water Animals, NOT Protists…
daphnia
chaetonotus
cypris
macrothrix
A rotifer
hydra
cyclops
rotifers