Observations of Apparent Lorica Variability in Salpingacantha (Ciliophora: Tintinnida) in the Northern Pacific and Arctic Oceans

John R. Dolan; Eun Jin Yang

Observations of Apparent Lorica Variability in Salpingacantha (Ciliophora: Tintinnida) in the Northern Pacific and Arctic Oceans

Publication date: 13.12.2017

Acta Protozoologica, 2017, Volume 56, Issue 3, pp. 217-220

https://doi.org/10.4467/16890027AP.17.019.7500

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Observations of Apparent Lorica Variability in Salpingacantha (Ciliophora: Tintinnida) in the Northern Pacific and Arctic Oceans

Abstract

Species identifications of tintinnid ciliates are based on characteristics of the lorica housing the ciliate cell. Molecular characterization of tintinnid ciliates has revealed the occurrence of cryptic species, genetically distinct forms with similar loricas, as well as polymorphic species in which genetically identical forms have distinct loricas. Among this latter category may be forms currently recognized as species of the genus Salpingacantha, erected by Kofoid and Campbell for forms originally described as varieties of species of Salpingella with ‘teeth’ on the margin of the lorica oral opening. Some workers have expressed the opinion that the genus is artificial and notably a recent molecular study suggested that Salpingella and Salpingacantha are likely synonyms. In this short communication we report on finding morphologically distinct loricas (containing ciliate cells) of Salpingacantha in single samples from stations in the North Pacific and Arctic Oceans in 2010, 2015 and 2016. We found up to 5 distinct Salpingacantha forms co-occurring, often with abundant Salpingella acuminata populations suggesting that some Salpingacantha species may be varieties of Salpingella acuminata. While we lack genetic data needed for definitive proof of polymorphism, here we document remarkable gradual gradients in morphology suggestive of polymorphism.

Keywords

microzooplankton, plankton, polymorphism, tintinnida

References

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Information

Information: Acta Protozoologica, 2017, Volume 56, Issue 3, pp. 217-220

DOI: https://doi.org/10.4467/16890027AP.17.019.7500

Article type: Original article

Authors

John R. Dolan

Sorbonne Universités, UPMC Univ Paris 06, UMR 7093, LOV, Observatoire Océanologique, F-06230, Villefranche-sur-Mer, France; CNRS, UMR 7093, LOV, Observatoire Océanologique, F-06230, Villefranche-sur-Mer, France

Eun Jin Yang

Korea Polar Research Institute, KIOST, 213-3 Songdo-dong, Yeonsu-gu, Incheon, 406-840, Korea

Published at: 13.12.2017

Article status: Open

Licence: CC BY-NC-ND

Percentage share of authors:

John R. Dolan (Author) - 50%

Eun Jin Yang (Author) - 50%

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English

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