Hydrurus C.Agardh, 1824, nom. cons.
Holotype species: Hydrurus vaucheri C.Agardh
Currently accepted name for the type species: Hydrurus foetidus (Villars) Trevisan
Original publication and holotype designation: Agardh, C.A. (1824). Systema algarum. pp. [i]-xxxvii, [1]-312. Lundae [Lund]: Literis Berlingianis [Berling].
Request PDFDescription: Cells arranged peripherally in large (up to 30 cm or more) bushy mucilaginous thalli, fixed to stones. Growth apical. Vegetative cells oval, with a 2-lobed chloroplast, with a pyrenoid, several dictyosomes, and contractile vacuoles. At swarmer formation, most of the thallus is dissolved into swarmers; each cell divides into two swarmers. Swarmers are tetrahedral, their shape maintained by a skeletal system of microtubules. There is one visible flagellum; the other is only seen in EM, reduced to a short stump hardly longer than its basal body. The flagellar roots constitute a complex system, most notable is a rhizoplast in connection with the nucleus and a large band-shaped microtubular root, from which the skeletal microtubules extend. Chloroplast has a large immersed pyrenoid, but no stigma, and is provided with a longitudinal furrow in which a mitochondrion is located. There are several contractile vacuoles and also several dictyosomes. Nuclear envelope intact during mitosis. Reproduction by zoospores which have a remarkable similarity to those of Celloniella in shape and flagellar apparatus. Stomatocysts lenticular, with an equatorial wing, as in Phaeodermatium. It might be possible that Phaeodermatium is part of the Hydrurus life history. Hydrurus is common in cold clear mountain streams worldwide. It has a peculiar and unpleasant smell described as foetid. During warm weather, the macroscopic form degrades and cysts form.
Information contributed by: J. Kristiansen. The most recent alteration to this page was made on 2024-05-16 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 masculine.
Most recent taxonomic treatment adopted: Kawai, H. & Nakayama, T. (2015). Introduction (Heterokontobionta p.p.), Cryptophyta, Dinophyta, Haptophyta, Heterokontophyta (except Coscinodiscophyceae, Mediophyceae, Fragilariophyceae, Bacillariophyceae, Phaeophyceae, Eustigmatophyceae), Chlorarachniophyta, Euglenophyta. In: Syllabus of plant families. Adolf Engler's Syllabus der Pflanzenfamilien. Ed. 13. Phototrophic eukaryotic Algae. Glaucocystophyta, Cryptophyta, Dinophyta/Dinozoa, Haptophyta, Heterokontophyta/Ochrophyta, Chlorarachnniophyta/Cercozoa, Chlorophyta, Streptophyta p.p. (Frey, W. Eds), pp. 11-64, 103-139. Stuttgart: Borntraeger Science Publishers.
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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=44157
Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 16 May 2024. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 23 November 2024
