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Acta Protozoologica

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Morphology and Ontogenesis of Hemiholosticha pantanalensis nov. spec. (Ciliophora, Hypotrichia, Psilotrichidae)

Publication date: 24.09.2019

Acta Protozoologica, 2019, Volume 58, Issue 3, pp. 93 - 113

https://doi.org/10.4467/16890027AP.19.010.11419

Authors

,
Peter Vďačný
Comenius University, Department of Zoology, Bratislava, Slovakia
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Wilhelm Foissner
Paris Lodron University of Salzburg, FB Ecology and Evolution, Salzburg, Austria
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Abstract

The morphology and ontogenesis of a new psilotrichid ciliate, Hemiholosticha pantanalensis, were studied using live observation, protargol impregnation, and scanning electron microscopy. Diagnostic features of the new species include: a medium-sized, almost circular to broadly obovate body with a short anterior projection; two macronuclear nodules with a single micronucleus in between; a total of about 35 cirri arranged in three ventral, one postoral, one right and one left marginal row; three dorsal kineties extending along prominent ribs; an adoral zone occupying about 60% of body length; and intracellular, eyespot-bearing, green algae almost filling the body. The ontogenesis of H. pantanalensis follows the psilotrichid mode, being a mixture of features found not only in various hypotrich taxa but also in other spirotrich groups. Specifically, the oral primordium develops in a deep pouch as in euplotids and oligotrichs, the anlage for the undulating membranes does not produce cirri as in euplotids and some schmidingerothrichids, and the longitudinal ventral cirral row R3 develops from two anlagen as in some amphisiellids and kahliellids. Since psilotrichids are classified in a polytomy of main hypotrich lineages in 18S rRNA gene phylogenies, some of their ontogenetic features might be ancient spirotrich plesiomorphies while others might be homoplasies.

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Information

Information: Acta Protozoologica, 2019, pp. 93 - 113

Article type: Original research article

Authors

Comenius University, Department of Zoology, Bratislava, Slovakia

Paris Lodron University of Salzburg, FB Ecology and Evolution, Salzburg, Austria

Published at: 24.09.2019

Article status: Open

Licence: CC BY-NC-ND  licence icon

Percentage share of authors:

Peter Vďačný (Author) - 50%
Wilhelm Foissner (Author) - 50%

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