Odontella C., 1832
Holotype species: Odontella aurita (Lyngbye) C.Agardh
Original publication and holotype designation: Agardh, C.A. (1832). Conspectus criticus diatomacearum. Part 4. pp. 49-66. Lundae [Lund]: Literis Berlingianus.
Taxonomic status: currently recognized as a distinct genus.
Most recent taxonomic treatment adopted: Sims, P.A., Williams, D.M. & Ashworth, M.[P.] (2018). Examination of type specimens for the genera Odontella and Zygoceros (Bacillariophyceae) with evidence for the new family Odontellaceae and a description of three new genera. Phytotaxa 382(1): 1-56, 156 figs, 2 text-figs.
Monotypic when first introduced. - (27 Jan 2017) - M.D. Guiry
Description: Cells oblong in girdle view, with long 'spines' and raised apical elevations. Often forming chains linked by the processes, with the tubular spines crossing each other. Plastids many, small, discoid. Marine, planktonic or epiphytic. Very abundant throughout the oceans. Valves elliptical or lanceolate, with no separation into face and mantle. Valve face plain or with fine granules, spinules or spines, sometimes with two ridges (which may be fibriate) running on either side delimiting an elliptical area in the centre. At each end there is an elevation, sometimes low and blunt, elsewhere horn-like, which bears an ocellus. Wall loculate, with fine external pores and round internal foramina. The edge of the valve mantle is sometimes recurved so that a groove runs around just above the free edge. The spines, which are very variable in length, are actually the exit tubes of the rimoportulae, and are placed in the centre of the valves or close to the bases of the elevations, diagonally opposite each other; they can have small apical spinules. Internally the rimoportulae are sessile and lie in slight depressions. Copulae split, with ligulae and clustered fimbriae along the advalvar edge; areolae simple, in vertical rows. The valvocopula is modified to fit the 'sculptured' edge of the valve mantle.The most recent alteration to this page was made on 10 Jan 2019 by M.D. Guiry.
Comments: Scott & Thomas (2005: 48) record this genus as being a member of the Family Eupodiscaceae. Odontella differs from Biddulphia in having distinct ocelli, rimoportulae that often have long external tubular extensions, and a loculate valve structure, with small external pores and simple foramina internally. We include in Odontella the following 'Biddulphia' species: auria, obtusa, edwardsii (possibly = rhombus), mobiliensis, regia and sinensis. The last two species are delicate planktonic forms. The coarser structure of O. aurita, and O. edwardsii and some others requires further investigation but for the moment we leave these taxa here.
Numbers of names and species: There are 79 species names in the database at present, as well as 8 infraspecific names. Of the species names, 12 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.
Scott, F.J. & Thomas, D.P. (2005). Diatoms. In: Antarctic marine protists. (Scott, F.J. & Marchant, H.J. Eds), pp. 13-201. Canberra & Hobart: Australian Biological Resources Study; Australian Antarctic Division.
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: 23 April 2002 by M.D. Guiry
Verified by: 10 January 2019 by M.D. Guiry
Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=44427
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 05 May 2021.