Under Construction


Kerstin Hoef-Emden and John M. Archibald
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Containing group: Cryptomonads


Described by Stein; type species Goniomonas truncata (freshwater; formerly Monas truncata Fresenius 1858; Stein 1878)


Discussion of Phylogenetic Relationships

Cell shape and flagellar appendages of Goniomonas differ markedly from those of plastid-containing cryptophytes. Similarity in ejectosome structure was an early indicator for a relationship of this genus to the cryptophytes (Schuster 1968). Phylogenetic analysis provided definitive evidence (McFadden et al. 1994). Different from other cryptophyte genera, marine and freshwater species of Goniomonas seem to have separated early in evolution and evolved as two clearly distinct lineages (Figure 1; von der Heyden et al. 2004).

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Figure 1. Molecular phylogeny of the genus Goniomonas. Maximum likelihood tree inferred from nuclear SSU rDNA sequences. Scale bar = substitutions per site. © Kerstin Hoef-Emden

Other Names for Goniomonas


Fresenius G (1858) Beiträge zur Kenntniss mikroskopischer Organismen. Abh. Senckenberg. Naturf. Ges. 2: 211-242

Jezbera J, Horňák K, Šimek K (2005) Food selection by bacterivorous protists: Insight from the analysis of the food vacuole content by means of fluorescence in situ hybridization. FEMS Microbiol. Ecol. 52: 351-363

Larsen J, Patterson DJ (1990) Some flagellates (Protista) from tropical marine sediments. J. Nat. Hist. 24: 801-937

Mignot JP (1965) Étude ultrastructurale de Cyathomonas truncata From. (flagellé cryptomonadine). J. Microscopie 4: 239-252

Mignot JP, Joyon L, Pringsheim EG (1968) Compléments a l'étude cytologique des cryptomonadines. Protistologica 4: 493-505

Schuster FL (1968) The gullet and trichocysts of Cyathomonas truncata. Exp. Cell Res. 49: 277-284

Stein F Ritter von (1878) Der Organismus der Infusionsthiere. W. Engelmann, Leipzig. Vol. 3.1

von der Heyden S, Chao E, Cavalier-Smith T (2004) Genetic diversity of goniomonads: An ancient divergence between marine and freshwater species. Eur. J. Phycol. 39: 343-350

Title Illustrations
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Scientific Name Goniomonas pacifica
Location material collected in marine sediments of Botany Bay (Sydney, Australia)
Creator Won Je Lee
Source Goniomonas pacifica
Source Collection Micro*scope
Image Use creative commons This media file is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike License - Version 2.5.
Copyright © Dr. Josef Brief
About This Page

This page is being developed as part of the Tree of Life Web Project Protist Diversity Workshop, co-sponsored by the Canadian Institute for Advanced Research (CIFAR) program in Integrated Microbial Biodiversity and the Tula Foundation.

Kerstin Hoef-Emden
Universität zu Köln, Köln, Germany

John M. Archibald
Dalhousie University, Halifax, Nova Scotia, Canada

Correspondence regarding this page should be directed to Kerstin Hoef-Emden at and John M. Archibald at

Page: Tree of Life Goniomonas. Authored by Kerstin Hoef-Emden and John M. Archibald. The TEXT of this page is licensed under the Creative Commons Attribution-NonCommercial License - Version 3.0. Note that images and other media featured on this page are each governed by their own license, and they may or may not be available for reuse. Click on an image or a media link to access the media data window, which provides the relevant licensing information. For the general terms and conditions of ToL material reuse and redistribution, please see the Tree of Life Copyright Policies.

Citing this page:

Hoef-Emden, Kerstin and John M. Archibald. 2008. Goniomonas. Version 14 September 2008 (under construction). http://tolweb.org/Goniomonas/97257/2008.09.14 in The Tree of Life Web Project, http://tolweb.org/

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