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Studies on the planktonic ciliate (Protozoa Ciliophora) genus Gymnozoum (Meunier, 1910), with description of Gymnozoum smalli n. sp. from the southern coast of Norway and supplemental description of G. intermedium from the Barents Sea
Dale, T. (1996). Studies on the planktonic ciliate (Protozoa Ciliophora) genus Gymnozoum (Meunier, 1910), with description of Gymnozoum smalli n. sp. from the southern coast of Norway and supplemental description of G. intermedium from the Barents Sea. Sarsia 81: 67-76
In: Sarsia. University of Bergen. Universitetsforlaget: Bergen. ISSN 0036-4827; e-ISSN 1503-1128
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| Abstract |
Two species of the genus Gymnozoum have been identified on the basis of protargol stained samples. G. intermedium which was found in field and cultivated samples from the Barents Sea, had five more kineties than in the original description. One contractile vacuole pore (sometimes two) was observed. This had pronounced canals situated in the middle of the cell, usually between somatic kineties n-7 and n-8. An area with densely packed kinetosomes was observed near the posterior end of one kinety, kinety ‘n’. G. intermedium is cannibalistic in culture and may feed on smaller specimens. A new species, Gymnozoum smalli n. sp. is described based on a sample from the southern coast of Norway. The cell is small, ellipsoid (42 µm x 30 µm) and has approximately 36 straight somatic kineties and one short curved kinetofragmon at its posterior end. Four of the somatic kineties extend forward and form semicircles around one half of the oral area. In between the semicircling kineties and the cytostome, eight short kineties, densely packed with kinetosomes, are also located. The macronucleus is ellipsoid (20 x 9 µm) and the micronucleus (2.3 x 1.8 µm) is spherical. A contractile vacuole pore may be seen between kineties n-4 and n-5. The prominent cytopharyngeal basket is heavily stained in the anterior half and less stained in the posterior half. Nothing is known of the feeding habit of this species. G. smalli n. sp. is the first species in this genus reported from a non-polar region. |
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