Order: Hypostomial frange not extensive (Carey, 1992).
Medium to large, some >100 μm long;
oral polykinetids only next to left rear of cytostome; large cyrtos has complete palisade of
nematodesmata (Illustrated Guide, 1985).
Suborder: With deep oral cavity (Illustrated Guide, 1985).
Family & Genus: Usually large
( >200 μm long or more);
preoral groove much expanded (Illustrated Guide, 1985).
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