STENTOR  , a genus of heterotrichous ciliate

Infusoria (q.v.), so named by R . Oken . It possesses a large moniliform meganucleus, accompanied by numerous micronuclei, and has a trumpet shape, when at rest, anchored by pseudopodial outgrowths from the narrow end . It is relatively large, and is much utilized to demonstrate myonemes, and had been also the object of interesting studies on regeneration, any piece, containing with a fragment of the meganucleus at least one micronucleus, regenerating the whole animal (see REGENERATION) . S. polymorphus often inhabits a gelatinous sheath and may be green with zoochlorella; it attains a length of ?b in . S. caeruleus and igneus are coloured blue and scarlet respectively by pigment granules in the ectosarc: E . R . Lankester made a study of the pigment of the former (blue stentorin) .