Suborder: Paroral dikinetid shorter than other oral structures;
no ribbed wall from paroral dikinetids towards cytostome (Illustrated Guide, 1985).
Family:
Genus: Small, slender, ovoid or pyriform in shape; dorsal rounded, ventral flattened;
large buccal cavity from anterior to the mid-point of the body; two long membranelles parallel
on the right margin of the buccal cavity; a long caudal cilium; a single macronucleus (Carey, 1992).
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