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New and little-known marine and freshwater species of the silica-scaled genera Thaumatomastix and Reckertia (Cercozoa: Thaumatomonadida)

Published online by Cambridge University Press:  24 September 2012

Kenneth H. Nicholls
Kenneth H. Nicholls*
Affiliation:
S-15 Concession 1, RR #1 Sunderland, Ontario, CanadaL0C 1H0
*
Correspondence should be addressed to: K.H. Nicholls, S-15 Concession 1, RR #1 Sunderland, Ontario, CanadaL0C 1H0 email: khnicholls@interhop.net
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Abstract

Six new marine species of the silica-scaled heterotrophic genus Thaumatomastix are formally described: two were found in Canadian Atlantic Ocean coastal waters (T. asymmetrica sp. nov. and T. sablensis sp. nov.) and four from Canadian Pacific Ocean coastal waters (T. inornata sp. nov., T. multipora sp. nov., T. gwaii sp. nov. and T. curvata sp. nov.). These discoveries more than double the number of known marine species of this genus from four to ten. The scale structures of all differ significantly from those of previously known species and therefore warrant erection as new species. Amended descriptions of two previously little-known freshwater species (T. triangulata and T. nigeriensis) are provided based on specimens found in freshwater ponds and lakes in Ontario, Lanada, and provide evidence refuting the recent published proposals to transfer T. triangulata back to the photo-autotrophic genus Chrysosphaerella and to transfer T. nigeriensis to the related thaumatomonad genus Reckertia. Until now, all known species of Reckertia (including several taxa previously classified in Thaumatomastix) were marine. This paper describes the first known freshwater species of Reckertia (R. hindoni sp. nov.) found in two separate Ontario ponds. The similarities and differences among many of the marine and freshwater species of Thaumatomastix suggest a common ancestor but significant evolutionary divergence over time and space.

Keywords

ThaumatomastixReckertiaCercozoaThaumatomonadidasand-dwellingheterotrophicsilica-scaled flagellates
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 93 , Issue 5 , August 2013 , pp. 1231 - 1244
Copyright
Copyright © Marine Biological Association of the United Kingdom 2012 

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