Family: Anterior preoral kinetal arcs of all, body tapers at forward end.
Genus: Cell body ovoid, with pre-oral suture skewed left to a point; ventrally flattened, dorsally convex (How to know the protozoa, 1979). With distinct postoral ? beak or unciliated field in ventral body cilia; preoral kinety complete (Illustrated Guide, 1985). Dorsal surface lacks bristles (cf. with bristles Trithigmostoma) ; central zone devoid of cilia (Carey, 1992).
Species: Nineteen to twenty ventral ciliary rows; oral basket with about twelve rods (nematodesmata) and with three preoral membranes; macronucleus oval, a characteristic concentric structure; micronuleus small; body 100-300 μm long (Kudo, 1966). 130-150 μm long (How to know the protozoa, 1979). 45 μm long, numerous contractile vacuoles (Carey, 1992).

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intact cells 150 x 97 μm 17 ciliary rows Japan, 199?	azure C stain	conjugation	intact cells 111 x 74 μm Watarase river Ashikaga Tochigi, 2004
intact cells 130 x 72 μm Japan, 199?	intact cells 110 x 53 μm Japan, 199?	C. cucullulus 99 x 52 μm 16 ciliary rows Saitama, 1999	C. cucullulus 102 x 42 μm ingesting food Uruguay, 1999
C. cucullulus 127 x 73 μm 18 ? ciliary rows Kurihashi Saitama, 2001	C. cucullulus 113 x 75 μm fungal symbionts? Iruma Saitama, 2001	C. cucullulus ? 108 x 64 μm ? ciliary rows Ushiku Ibaraki, 2002	C. cucullulus ? 108 x μm ? ciliary rows Takimamuro Konosu Saitama, 2005
C. cucullulus 105 x 54 μm Shimo-nanbata Fujimi Saitama, 2005

Similar Genus ->> Trithigmostoma; Chilodontopsis

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