Lectotype species: Trachelomonas volvocina (Ehrenberg) Ehrenberg
Original publication:Ehrenberg, C.G. (1834). Dritter Beitrag zur Erkenntniss grosser Organisation in der Richtung des kleinsten Raumes. Abhandlungen der Königlichen Akademie der Wissenschaften zu Berlin 1833: 145-336, pls I-XIII.
Type designated in Ehrenberg, C.G. (1838). Die Infusionsthierchen als vollkommene Organismen. Ein Blick in das tiefere organische Leben der Natur. pp. i-xviii, [1-4], 1-547, , pls I-LXIV. Leipzig: Verlag von Leopold Voss.
Taxonomic status: currently recognized as a distinct genus.
Gender: This genus name is currently treated as feminine.
Most recent taxonomic treatment adopted: Cavalier-Smith, T. (2016). Higher classification and phylogeny of Euglenozoa. European Journal of Protistology 56: 250–276, 2 figs.
Description: Free-swimming, solitary, Euglena-like cells, completely enclosed in an envelope with a sharply defined neck or collar surrounding an apical pore through which the very long locomotory flagellum emerges; naked cells escape from the envelope during reproduction (and at other times) but immediately secrete a new envelope of species-specific shape and size (spherical, ovoid, ellipsoid or elongated; (20)30-40(50) _ (10)20(35)) _m which is colorless and smooth at first but soon becomes brown, ornamented (pores, punctae, spines, warts, ridges) and brittle with iron and manganese salts; most species are green, phototrophic, with chloroplasts of several different types (numerous, small, discoid, without pyrenoids; flat plates with double-sheathed pyrenoids; flat plates with inwardly-projecting pyrenoids; or flat plates with naked pyrenoids); a few species are colorless and osmotrophic; all other characters as Euglena. Deflandre's (1926) monograph defines many species by size, shape and ornamentation of their envelopes elaborating Conrad's (1916) artificial classification of the genus into sections according to envelope shape. These systems are followed by Huber-Pestalozzi (1955), Bourrelly (1970) and Starmach (1983), among others, but Pringsheim (1953c) showed that natural groupings should be based upon chloroplast and pyrenoid structure (as in Euglena, Pringsheim, 1956). In culture, the chemistry and ornamentation of envelopes can be varied, suggesting that many of the named species and varieties (more than 600 in total) are synonymous (Pringsheim, 1953c). Formation, structure and chemistry of the envelopes in several Trachelomonas species have been studied in the EM by Leedale (1975), West and others (1980), and other researchers. Freshwater, in acidic to neutral waters (pH 4.5-7), often in peaty pools and other habitats rich in iron and manganese; common and cosmopolitan. Emended diagnosis (Marin & Melkonian in Marin et al. 2003: 104).
Information contributed by: G.F. Leedale. The most recent alteration to this page was made on 30 Dec 2017 by M.D. Guiry.
Numbers of names and species: There are 619 species names in the database at present, as well as 1178 infraspecific names. Of the species names, 371 have been flagged as accepted taxonomically on the basis of the listed literature under the species name. In some instances, opinions on taxonomic validity differ from author to author and users are encouraged to form their own opinion. AlgaeBase is a work in progress and should not be regarded as a definitive source only as a guide to the literature..
Names: ('C' indicates a name that is accepted taxonomically; 'S' a homotypic or heterotypic synonym; 'U' indicates a name of uncertain taxonomic status, but which has been subjected to some verification nomenclaturally; 'P' indicates a preliminary AlgaeBase entry that has not been subjected to any kind of verification. For more information on a species click on it to activate a link to the Species database):
Click here to also show infraspecific names in the list below.
Ciugulea, I. Nudelman, M.A., Brosnan, S. & Triemer, R.E. (2008). Phylogeny of the euglenoid loricate genera Trachelomonas and Strombomonas (Euglenophyta) inferred from nuclear SSU and LSU rDNA . Journal of Phycology 44(2): 406-418.
Brosnan, S., Brown, J.P., Farmer, M.A. & Triemer, R.E. (2005). Morphological separation of the euglenoid genera Trachelomonas and Strombomonas (Euglenophyta) based on lorica development and posterior strip reduction. Journal of Phycology 41: 590-605.
Verification of data
Users are responsible for verifying the accuracy of information before use, as noted on the website Content page.
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.
Created: 11 April 2002 by M.D. Guiry
Verified by: 30 December 2017 by M.D. Guiry
Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=43657
Please cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2018. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 12 December 2018.