Keratophora Pantocsek, 1889
Lectotype species: Keratophora nitida Pantocsek
Original publication:Pantocsek, J. (1889). Beiträge zur Kenntnis der Fossilen Bacillarien Ungarns. Teil II. Brackwasser Bacillarien. Anhang: Analyse de marine Depots von Bory, Bremia, Nagy-Kurtos in Ungarn; Ananio und Kusnetzk in Russland. pp. 123, 30 pls.: Nagy-Tapolcsány, Buchdrucherei von Julius Platzko.
Type designated in Ross, R. & Sims, P.A. (1985). Some genera of the Biddulphiaceae (diatoms) with interlocking linking spines. Bulletin of the British Museum (Natural History) 13: 277-381.
Taxonomic status: currently recognized as a distinct genus.
Most recent taxonomic treatment adopted: Round, F.E., Crawford, R.M. & Mann, D.G. (1990). The diatoms biology and morphology of the genera. pp. [i-ix], 1-747. Cambridge: Cambridge University Press.
This is a genus of fossil species, or a genus with a fossil type species, or a genus the type species of which was originally described as a fossil.
Description: Cells ellipsoidal in valve view with two elevations arising from transapical ridges; the elevations unite the cells into inseparable chains (Ross & Sims, 1985). Rectangular in girdle view. A small fossil genus (3 spp. in VanLandingham, 1971, but monotypic according to Ross & Sims, 1985) known from Hungary and Russia, in deposits of Eocene age; presumably marine. Valves oval, traversed by two raised, transapical ridges from the centres of which arise two elevations; these bend towards the apices but finally bend again so that the flat tops of their slightly swollen apices lie parallel to the plane of the valve. The elevations have pores radiating from the outermost point, forming a lateral ocellus. The flat top is also porous but less densely so, and is surrounded by a ring of ridges (these are the remains of eroded linking spines, which are illustrated well by Ross & Sims, 1985); in our material the ridges are higher on the side opposite the ocellus. The valve surface is areolate with an indistinct radiating pattern; the areolae are round. No vela are present in the material investigated, but Ross & Sims illustrate a substantial velum. There is a prominent, vertical valve mantle which at high magnification appears to be finely ridged or possibly finely porous. There are no obvious portules either in our material or that of Ross & Sims. The cingulum is illustrated in Ross & Sims and consists of porous bands, which are split and ligulate; further work is necessary to revale the full detail.The most recent alteration to this page was made on 20 Oct 2011 by M.D. Guiry.
Comments: This is a genus close fo Kittonia though differing in the structure of the processes which are reminiscent of those in 'hemiauloid' genera. According to Ross & Sims the genus is monotypic; their excellent paper also gives details of the history of the genus and compares it with Dicladiopsis, Strelnikovia and Thaumatonema, all fossil genera which we have not been able to study.
Numbers of names and species: There are 3 species names in the database at present, of which 1 has 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.
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: 16 September 2003 by M.D. Guiry
Verified by: 20 October 2011 by M.D. Guiry
Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=46629
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.