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URCEOLARIS GROUP 

38 a. Each anterior spine smooth and symmetrical. Lorica thin, but with
      distinct dorsal and ventral plates..............................39

38 b. Each anterior spine on lorica asymmetrical, with shoulder on one
      side............................................................40

39 a. Dorsal surface of lorica smooth. Size 200-300 μm. Mainly bentic,
      often attached to the substrate, but also in open water. In ponds,
      lakes, running water. In freshwater but also in saline water.
      Appears to be confined to alkaline eutrophic waters [2003]. Feeds
      on unicellular green algae. Rare
      - Muntinglupa

          Brachionus urceolaris, MULLER 1773
                     [1978a+b, 1986]

39 b. Dorsal surface of lorica with longitudinal striations and pitting
      on well set-off basal piece. In dystrophic and acid waters - can 

      also grow at neutral pH in the laboratory [2000].
      - Calamba River, IRRI Rice field.

          Brachionus sericus, ROUSSELET 1907 

(syn. B. urceolaris. var. sericus)

           [1999]

40 a. Lorica thin, but with distinct dorsal and ventral plate.

       Size 150-200 µm. Food mainly unicellular algae: Chlorococcales,

       Euglenoides, but also detritus and bacteria. Epizoic, often found

       attached to Moina (Cladocera). In eutrophic ponds, also free

       swimming in open freshwater, sporadic in brackish water.

       - Fishpond in Los Baños (Seven Lakes), Calamba River,

         Laguna de Bay, Calamba River, IRRI Rice field.

           Brachionus rubens, EHRENBERG 1838.
                    [1984, 1999]

To 40 b.