Family: Oral nematodesmata not a ring around mouth, more prominent to side and rear of mouth; typically 3 long, large polykinetids in oral cavity; cytostome expands along postoral suture .
Genus: Postoral kineties usually to left of oral poykinetids (Illustrated Guide, 1985). Left edge is more curved than right edge; cytopharynx with numerous strong fibrils; ectoplasm with numerous fusiform trichocysts; macronucleus oval; one to several micronulei (Kudo, 1966).
RAPD tree of Frontonia (Tsukii, Jpn. J. Protozool., vol. 36, 2002)
F. leucas
Nnm-1
12 images
μm
4-9 Mic.
Matsumoto
Nagano, 2001
Cos-2
13 images
μm
3-7 Mic.
Ichikawa
Chiba, 2001
Cos-1
17 images
μm
3-4 Mic.
Ichikawa
Chiba, 2001
Gmt-6
13 images
μm
2-4 Mic.
Tatebayashi
Gunmma, 2001
Hsf-4
11 images
μm
Sanda
Hyogo, 2001
SIR-24
6 images
μm
Iruma
Saitama, 2002
Ckr-1
13 images
μm
0 Mic. ?F. vernalis & Frontonia sp.
Hsf-32
8 images
μm
Sanda
Hyogo, 2001
Tms-1
17 images
μm
? Mic.
Tochigi,
Tms-2
10 images
μm
1-2 Mic.
Tochigi,F. marina
Shm-1
16 images
158-185 x 53-72 μm
1-3 Mic.
Mishima
Shizuoka, 2001
40-1a
19 images
μm
2-3 Mic.
USA, 1999
D-5
15 images
μm
1-2 Mic.
Tokyo, 199?
Tna-1
13 images
μm
1-2 Mic.
Tochigi,F. acuminata
Kgy-2
8 images
μm
1 Mic.
Yaku Island
Kagoshima, 2001
Tou-1
9 images
μm
1 Mic.
Ujiie (Sakura)
Tochigi, 2001F. depressa
27-1B
4 images
μm
1 Mic.
Hiroshima, 199?
Similar Genus --> Disematostoma
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