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MYTILINIDA, HARRING, 1913 (family)  

MYTILINA, BORY ST. VINCENT 1826.

(syn. Diplacidium, Diplax, Salpina)

Strongly loricate. Two dorsal ridges with a
furrow between. Almost always with variable
anterior and posterior spines. Toes two,
longer than foot. Prefer alkaline waters
(Sládeček 1983). Found among plants,
littoral and benthic, only as guests
in the plankton (tychoplanktonic): Pasig River.
    [2009a]

55 a. Lorica transparent with three keels on the back.
Frontal edge smooth and curved. Toes thin and
straight ending in an acute point. Littoral in
ponds and lakes. Indicator of mesotrophic waters
(Sládeček 1983). Rare.
- Laguna de Bay, IRRI, Consolacion (Cebu)
   Mytilina bisulcata              
          [1978a+b, 1986a]

IRRI, Los Baños. (Photo: Flemming Petersen, 1980)

55 b. Lorica heavily stippled in anterior region.
With small spines. Posterior ventral spines
longer than the posterior dorsal spine.
Two toes, well developed with acute points.
Size 170-225 µm. A fairly variable species.
Littoral in pond and lakes. Common.
- Paoay Lake, Bustos Dam, Lake Lanao,
  Calamba River
   Mytilina ventralis, EHRENBERG, 1832
          [1978a+b, 1986a, 1999]

TRICHOTRIIDAE, HARRING, 1913 (family)

 

TRICHOTRIA, (BORY ST. VINCENT 1827)

56 a. Lorica vase-shaped, longer than broad.
Trunk, head and foot clearly defined.
Sturdy lorica facetted and pustulate,
with ridges and spines. Foot with 3 segments,
first with two dorsal triangular spines.
Two slender toes about as long as foot.
Eye single. Littoral, rarely or never
in plankton
- Laguna de Bay, Bustos Dam, Roadside ditches along Lake
  Lanao.
   Trichotria tetractis (EHRENBERG, 1830)
          [1978a+b, 1986a, 1999]

To 57 a.