Cristigera susami     (Ciliata)
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Taxonomy
Kingdom:Chromista
Phylum:Ciliophora
Class: Oligohymenophorea
Order:Pleuronematida
Family:Cyclidiidae

Description

Body is ovoid, much compressed, anterior end pointed and posterior end slightly broad with a distinctly convex dorsal surface and a somewhat flattened ventral surface. The cytoplasm of the anterior third of the body contains dense granules by which it differs from the rest of the body. Macronucleus is usually round, rarely ovoidal and measures 5.1-10.2 µm * 3.4-8.5 µm. Buccal cavity occupies a conspicuous position on the ventral surface of the body, lying just above the macronucleus and extending to the mid-ventral line of the body. The cytostome is located towards the left margin of this cavity and possesses an undulating membranelle that forms a protruded cup like structure. The somatic cilia of the anterior third of the body are 5.1 µm and the posterior ones are 3.7 µm in length. One long caudal cilium (11.9 µm) is present at the tip of the posterior end which is evidently visible in the living condition. Generally the organism moves spirally being assisted with the trailing cilium.

The species multiplies normally by binary fission throughout the season. Conjugation has been observed in the early winter season.

Synonym (s)

Common Name (s)
Economic Importance and Threats

Ecology

Biogeography


• West Bengal, Hugli River Mouth INDIA
• West Bengal, Sagar Island INDIA

Literature Source(s)
  • Jamadar, YA and Choudhury, A (1990) Ciliates of some marine and estuarine molluscs from Indian coastal region Technical Monograph ZSI, Calcutta 12 p 79 Available at - NIO, Goa

Page last updated on:2012-02-03

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