Trachelomonas Ehrenberg, 1834
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.
Request PDFType 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-[548], 64 pls. Leipzig: Verlag von Leopold Voss.
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 2017-12-30 by M.D. Guiry.
Taxonomic status: This name is of an entity that is currently accepted taxonomically.
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.
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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=43657
Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 30 December 2017. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 24 November 2024
