Calycimonas H.R.Christen, 1959

Holotype species: Calycimonas physaloides H.R.Christen

Original publication and holotype designation: Christen, H.R. (1959). New colorless Eugleninae. Journal of Protozoology 6: 292-303.

Description: Rigid, ovoid, colorless, phagotrophic flagellates, 25-70 _m long, with 5-8 pronounced helical keels; one flagellum emergent from the subapical canal opening, held straight, anteriorly, during gliding; food vacuoles observed in all species but no ingestion organelle. The taxonomic position of this genus, near to Petalomonas except for the latter's flattened cell and Tropidiscyphus except for the latter's 2 flagella, is discussed by Christen (1959). However, new ultrastructural observations on Calycimonas physaloides (Mignot, 1966) and C. robusta (Triemer and Farmer, 1991b) reveal a simple feeding apparatus consisting of a cytoplasmic pocket reinforced by microtubules. Triemer and Farmer (1991b) argue that this feeding apparatus (Type I in their system) removes the main distinction between Sphenomonadales and Heteronematales and these orders should be merged. Alternatively, it could reasonably be suggested that the order Sphenomonadales be retained for phagotrophic euglenoids with a simple feeding apparatus lacking ingestion rods or siphons. Freshwater, France and Switzerland. Rigid, ovoid, colorless, phagotrophic flagellates, 25-70 _m long, with 5-8 pronounced helical keels; one flagellum emergent from the subapical canal opening, held straight, anteriorly, during gliding; food vacuoles observed in all species but no ingestion organelle. The taxonomic position of this genus, near to Petalomonas except for the latter's flattened cell and Tropidiscyphus except for the latter's 2 flagella, is discussed by Christen (1959). However, new ultrastructural observations on Calycimonas physaloides (Mignot, 1966) and C. robusta (Triemer and Farmer, 1991b) reveal a simple feeding apparatus consisting of a cytoplasmic pocket reinforced by microtubules. Triemer and Farmer (1991b) argue that this feeding apparatus (Type I in their system) removes the main distinction between Sphenomonadales and Heteronematales and these orders should be merged. Alternatively, it could reasonably be suggested that the order Sphenomonadales be retained for phagotrophic euglenoids with a simple feeding apparatus lacking ingestion rods or siphons. Freshwater, France and Switzerland.

Information contributed by: G.F. Leedale. The most recent alteration to this page was made on 2021-03-18 by M.D. Guiry.

Taxonomic status: This name is of an entity that is currently accepted taxonomically.

Most recent taxonomic treatment adopted: Kostygov, A.Y., Karnkowska, A., Votýpka, J., Tashyreva, D., Maciszewski, K., Yurchenko, V. & Lukeš, J. (2021). Euglenozoa: taxonomy, diversity and ecology, symbioses and viruses. Open Biology 11(200407): 1-47.

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Contributors
Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in CD format. These AlgaeBase descriptions are now being continually updated, and each current contributor is identified above. The PSA and AlgaeBase warmly acknowledge the generosity of all past and present contributors and particularly the work of Dr Parker.

Descriptions of chrysophyte genera were subsequently published in J. Kristiansen & H.R. Preisig (eds.). 2001. Encyclopedia of Chrysophyte Genera. Bibliotheca Phycologica 110: 1-260.

Linking to this page: https://www.algaebase.org/search/genus/detail/?genus_id=45216

Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 18 March 2021. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 25 April 2024