FILINIIDAE, HARRING AND MEYERS, 1926 (family)
Without foot. Cuticle thin, transparent,
not usually retaining its shape well after
preservation. Body with long spines, 2 anterior
and 1 (Filinia) or 2 (Tetramastix) posterior
spines. Planktonic.
The separation in two genera (Filinia and
Tetramastix) based on the number of posterior
spines might not be valid since intermediates
are found (RuttnerKolisko 1972).FILINIA, BORY ST. VINCENT 1824.
TETRAMASTIX GROUP
71 a. Two posterior spines developed. One well
developed (200 μm)one more or less reduced
(= spine). Lateral spines broad-based,
club-like, and only slightly longer the body.
Body spindle-shaped. Size 150-200 μm.
Shows affinity for Cryptomonads,
Bluegreens and Dinoflagellates in
Lake Lanao (Lewis 1979). Warm stenotherm,
planktonic in lakes and ponds.
- Laguna de Bay, La Mesa Dam, Calibato Lake,
Lake Lanao, Paoay Lake.
Filinia opoliensis, (ZACHARIAS, 1898)
(syn. Tetramastix opoliensis)
[1941, 1974,1977, 1978a,b, 1979b,
1980, 1984, 1986, 2008b]
F. opoliensis from Laguna de Bay
F. opoliensis
(Photo Rey Donne S. Papa, 2007)
71 b Only one posterior spine........................72
FILINIA-TERMINALIS GROUP
72 a. Only one posterior spine, arising from the
ventral surface. Spines not thickened at
the base. Lateral spines much longer than body.
Inserted more than 10 μm from terminal end of
body. Size of body 150-250 μm, spines 510 μm.
Lake form usually with longer spines than pond
form. Form limnetica if spines 4 times longer
than body or more. Feed on detritus and bacteria,
with a particle size less than 10 μm.
- Laguna de Bay, Sampaloc Lake.
Filinia longiseta (EHRENBERG, 1834)
(syn. Triarthra longiseta)
[1941, 1974, 1980, 1984, 1999]
F. longiseta from Laguna de Bay
72 b. Small, cylindrical-oviform body, posterily rounded
but may be fusiform in contracted individuals.
Posterior spine inserted 4-10 μm from terminal
end of body, slightly thickened at base. Like
F. terminalis. Body length 120-140 μm. Lateral
spines 265-350 μm. Terminal spine 180-290 μm.
In eutrophic lakes and rice fields (Shiel and
Sanoamuang, 1993, Tuyor and Segers, 1999)
- IRRI rice field.
Filinia novaezealandiae, SHIEL AND SANOAMUANG, 1993
[1999]
To 73a
