Abstract
A freshwater peritrich ciliate, Epistylis lalinensis n. sp., was collected from Lalin River, Harbin, China, and its morphology, infraciliature and silverline system were investigated based on living and silver-impregnated specimens. The new species measured 125-187 × 31-47 μ m in vivo and is characterized by having green-coloured endoplasm containing symbiotic algae, single apically located contractile vacuole, one-layer peristomial collar and slender body shape. The Cshaped macronucleus is transversely located. Three equally kineties in polykinety 3 parallel to each other. Number of silverlines between peristome and aboral trochal band, 117-145; between aboral trochal band and scopula, 50-68. Comparing most other congeners, circular fibers of this species composed of internal and external layers.
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