Heliozoa


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Heliozoa

 

a subclass of protozoans of the class Sarcodina. The body is usually globose and has raylike appendages (pseudopodia) with dense protoplasmic axial filaments. Heliozoans include naked forms and forms having an external siliceous skeleton. There may be one or more nuclei. The majority of heliozoans are freshwater or marine planktonic organisms; some attach themselves to a substrate by means of a stalk. The protozoans feed on algae, protozoans, and rotifers; several individuals may combine to overcome larger prey. Heliozoans have contractile vacuoles. Reproduction is usually by binary fission. A sexual process has been observed in some species; the gametes resemble small adult individuals.

References in periodicals archive ?
An electron microscopical study of freshwater heliozoa (genus Acanthocystis, Centrohelidia) from Chile, New Zealand, Malaysia and Sri Lanka.
On the centrohelid and rotosphaerid heliozoa from the environs of the Vortsjarv Limnological Station in Estonia.
Freshwater scaled heterotrophic flagellates, ciliates, amoeba and heliozoa from four gulf states.
Taxon Location Heterotrophic Flagellate * Cyathobodo crucifera AL-22; MS-23 Ciliate Lepidotrachelophyllum LA-8 fornicus Rhizopod Amoeba Cochilopodium LA-30 bilimbosum Cristidiscoid Heliozoa Pinaciophora LA-2, 15 fluviatilis Raphidiophrys capitata LA-2; MS-27 * Raphidiophrys MS-27 intermedia * Polyplacocystis LA-22; TX-1 marginata Centrohelid Heliozoa * Acanthocystis LA-17 durrschmidtidae * Acanthocystis MS-11 pectinata * Acanthocystis MS-27 polymorpha * Choanocystis aculeata LA-4 * Choanocystis rotundata LA-40 ssp.
Organization and control of microtubule pattern in centrohelidan Heliozoa.