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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Neobursaridium
238 μm
Japan, 1998
