Lectotype species: Dinobryon sertularia 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 Fromentel, É. de (1874). Études sur les microzoaires, ou infusoires proprement dits: comprenant de nouvelles recherches sur leur organisation, leur classification et la description des espèces nouvelles ou peu connues / par E. de Fromentel ; planches et notes descriptives des espèces par J. Jobard-Muteau. pp. i-vii, 1-364. Paris: G. Masson, Éditeur.
Taxonomic status: currently recognized as a distinct genus.
Gender: This genus name is currently treated as neuter.
Most recent taxonomic treatment adopted: Kristiansen, J. & Preisig, H.R. (2001). Encyclopedia of Chrysophyte genera. Bibliotheca Phycologica 110: 1-260.
Description: Cells free-living, surrounded by a lorica, solitary or united in branched colonies. Lorica cylindrical, vase- or funnel-shaped, with smooth or undulated walls, in a few species with spiral thickenings. Lorica constructed of cellulosic microfibrils in loops arranged in a spiral pattern, excreted during cell rotation. Daughter cells of colonial species construct the lorica inside near the mouth of the mother cell lorica, thereby generating the characteristic colony shape. In a few species the new lorica forms on the outer side of the old one. Cell cylindrical to fusiform, attached to the bottom of the lorica by a contractile stalk. Two heterokont flagella, inserted asymmetrically in a pit. Two chloroplast lobes, one with a distinct stigma in juxtaposition to photoreceptor on the short flagellum. One large Golgi body visible by light microscopy in the front part of the cell. Reproduction by longitudinal division; one daughter cell settles on the mother cell lorica or escaping. Sexual reproduction observed; a male gamete without lorica approaches a colony fusing with a loricate female cell, forming a zygotic cyst. In solitary species, sexual reproduction occurs as isogamy, and the two empty loricae remain attached to the zygote. Both zygotic and asexual stomatocysts form at the mouth of the lorica. The silicified wall may be smooth or sculptured, the degree of sculpting dependent on external factors such as temperature. The porus may be surrounded by a neck of specific shape. Zygote orientation is also of taxonomic value. The cyst is located within a special encystment chamber. At germination it has been observed how a special germination chamber was produced releasing 4 swarmers.
Information contributed by: J. Kristiansen. The most recent alteration to this page was made on 7 Feb 2020 by M.D. Guiry.
Comments: Some colonial Dinobryon species occur abundantly and characterize clear water lakes in temperate regions worldwide; other, solitary species occur in arctic regions. Only a few species are marine. Albeit with conspicuous chloroplasts, Dinobryon species are highly phagotrophic, and their predation on bacteria can play a significant role in the limnetic food web (Veen, 1991). In this way Dinobryon covers most of its P-requirements and can thus compete in phosphorus-poor waters.
Numbers of names and species: There are 93 species names in the database at present, as well as 81 infraspecific names. Of the species names, 37 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.
Bérard-Therriault, L., Poulin, M. & Bossé, L. (1999). Guide d'identification du phytoplancton marin de l'estuaire et du Golfe du Saint-Laurent incluant également certains protozoaires. Publication Spéciale Canadienne des Sciences Halieutiques et Aquatiques 128: 1-387.
Nicholls, K.H. & Wujek, D.E. (2003). Chrysophycean Algae. In: Freshwater Algae of North America. (Wehr, J.D. & Sheath, R.G. Eds), pp. 471-510. San Diego: Academic Press.
Throndsen, J. (1996). The planktonic marine flagellates. In: Identifying marine phytoplankton. (Tomas, C.R. Eds), pp. 591-730. San Diego: Academic Press.
Veen A. (1991). Ecophysiological studies on the phagotrophic phytoflagellate Dinobryon divergensImhof. PhD Thesis. pp. -125. Amsterdam: University of Amsterdam.
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: 21 January 2017 by M.D. Guiry
Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=43781
Please cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2021. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 25 July 2021.