An Illustrated Key 
to the Philippine 
Freshwater Zooplankton.

Click the numbers to see the figures.

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  1 a. Unicellular animal:

PROTOZOA, Protozoans (phylum);

RHIZOPODA (class);

TESTACEA: testacean rhizopods (subclass).
          Characterized by having a shell:
                       Arcellidae, Centropyxidae, Difflugiidae (families).

(Fig. 1a are test shells as seen in the

 counting chamber - FP₈₀)  

Arcellidae from Laguna de Bay

Difflugiidae  from Laguna de Bay

Centropyxidae from Laguna de Bay

 

HELIOZOA, Sun animalcules.
              Roughly spherical amoeboids with many stiff,
              microtubule-supported projections called 
              axopods radiating outward from the cell surface.
              (after wikipedia)

CILIATA, Ciliates (class): Size 20-500 μm.

Tintinnida etc.

From less than 1 to 300 individuals/mL in plankton. Food: mainly bacteria.

 

Tintinnidae from Laguna de Bay

 1 b. Multicellular animals, METAZOA, Metazoans.........................2

 

To 2a