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A Huge Diversity of Metopids (Ciliophora, Armophorea) in Soil from the Murray River Floodplain, Australia. II. Morphology and Morphogenesis of Lepidometopus platycephalus nov. gen., nov. spec.

Publication date: 22.09.2017

Acta Protozoologica, 2017, Volume 56, Issue 1, pp. 39 - 57

https://doi.org/10.4467/16890027AP.17.004.6968

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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Titles

A Huge Diversity of Metopids (Ciliophora, Armophorea) in Soil from the Murray River Floodplain, Australia. II. Morphology and Morphogenesis of Lepidometopus platycephalus nov. gen., nov. spec.

Abstract

The morphology and morphogenesis of a new Australian metopid ciliate, Lepidometopus platycephalus nov. gen., nov. spec., were studied using live observation, various silver impregnation methods, scanning electron microscopy, and morphometry. The new genus is outstanding in having epicortical scales (lepidosomes) and a strongly flattened and distinctly projecting preoral dome. Diagnostic features of L. platycephalus include a small, reniform body carrying an elongated caudal cilium, about 11 ciliary rows, and an adoral zone composed of an average of 11 polykinetids. The morphogenesis of L. platycephalus matches data from other metopids in that (1) the body is drastically re-shaped, (2) the parental oral structures are reorganized but do not contribute to the daughter oral ciliature, (3) the opisthe’s adoral polykinetids originate pleurotelokinetally, (4) the opisthe’s paroral membrane is formed via re-arrangement of the posterior portion of the first two perizonal rows, and (5) the opisthe’s perizonal stripe is made by three parental perizonal rows and two dorsolateral ciliary rows. The morphogenetic data corroborate phylogenetic analyses in that caenomorphids are only superficially similar to metopids; metopids and clevelandellids are closely related; and litostomateans are the best candidates for a sister group of the metopid-clevelandellid assemblage within the SAL superclade.

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Information

Information: Acta Protozoologica, 2017, Volume 56, Issue 1, pp. 39 - 57

Article type: Original article

Authors

Comenius University, Department of Zoology, Bratislava, Slovakia

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

Published at: 22.09.2017

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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English