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The World of Protozoa, Rotifera, Nematoda and Oligochaeta

[ref. ID; 4356 (Wolfgang Petz and Wilhelm Foissner, 1992)]

Class Oligotrichea Butschli, 1887

Subclass I. Halteriia n. subcl.

Order Halteriida n. ord.

Subclass II. Oligotrichia Butschli, 1887

Order Strombidiida Jankowski, 1980

Order Oligotrichida Butshli, 1887

Class Oligotrichea Butschli, 1887

Body typically small, ovoid to elongate, Perilemma present in some (all?) species. Somatic ciliature commonly reduced, rarely absent. Adoral zone of membranelles conspicuous, forms flat spiral on peristomial surface ("closed" circle in top view; Strobilidiina, Tintinnina) or extends as cured ribbon onto ventral side ("open" circle; Halteriia, Strombidiida); paroral membrane monostichomonad; no endoral membrane. Morphogenesis enantiotrophic; stomatogenesis apokinetal on or below cell surface; somatic ciliature originates de novo (Halteriia) or by intrakinetal proliferation (Strobilidiina, Tintinnina; uncertain in Strombidiida); macronucleus with one or two replication bands. Mainly planktonic in marine and freshwater habitats.

Subclass Halteriia n. subcl.

Body small, ovoid. Adoral zone of membranelles extends as curved ribbon onto ventral side. Oral primordium develops on cell surface; entire somatic ciliature originates de novo. Predominantly freshwater species, some also edaphic.