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Description of Homalozoon vermiculare

Homalozoon vermiculare (Stokes,1887) Stokes,1890  Description;  Homalozoon vermiculare is a large, bottom-dwelling, carnivorous ciliate found in standing fresh water.Body 150-1500 um long; vermiform,laterally compressed, Anterior end slightly expanded as distinct rounded oral bulge packed with thin rod-shaped extrusomes;posterior end tapered to broadly rounded. Single moniliform macronucleus,about 25 micronuclei. 5-21 contractile vacuoles along dorsal side.4 types of extrusomes, 2 types of small subpellicular mucocysts and long (~5-15 um) and short (~2 um) thin rod-shaped extrusomes in the oral bulge, short extrusomes also scattered in cytoplasm.Prominent aggregation of refractile granules in cytoplasm posterior to oral bulge (parapharyngeal mass);composed of two types of granules,one composed of paraglycogen,he second type is comprised of concentric lamellae and is rich in magnesium, phosphorus, potassium, and calcium;function of parapharyngeal mass remains unknown.Somatic ciliature consists of 10-20 right longitudinal kineties with ~10 um cilia, 3-4 left kineties with 1-2 um bristles, anterior ends of these kineties bear clavate cilia comprising the dorsal brush.Circumoral kinety separate from somatic kineties. 


Creative Commons Attribution Non Commercial 3.0 (CC BY-NC 3.0)

William Bourland

Source: BioPedia

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