161,424 species and infraspecific names are in the database, 22,723 images, 62,809 bibliographic items, 473,325 distributional records.

Biddulphia S.F.Gray, 1821

Empire Eukaryota
Kingdom Chromista
Phylum Bacillariophyta
Subphylum Bacillariophytina
Class Mediophyceae
Subclass Biddulphiophycidae
Order Biddulphiales
Family Biddulphiaceae

Lectotype species: Biddulphia pulchella S.F.Gray

Currently accepted name for the type species: Biddulphia biddulphiana (J.E.Smith) Boyer

Original publication:Gray, S.F. (1821). A natural arrangement of British plants, according to their relations to each other, as pointed out by Jussieu, De Candolle, Brown, &c. including those cultivated for use; with an introduction to botany, in which the terms newly introduced are explained; illustrated by figures. pp. vol. 1: [i]-xxviii, [1]- 824, pls I-XXI plates. London: Printed for Baldwin, Cradock & Joy, Paternoster-Row.
 Download PDF

Type designated in Kützing, F.T. (1834 '1833'). Synopsis diatomearum oder Versuch einer systematischen Zusammenstellung der Diatomeen. Linnaea 8: 529-620, pls XIII-XIX [79 figs].
 Download PDF

Taxonomic status: currently recognized as a distinct genus.

Description: Cells robust, rectangular in girdle view, elliptical in valve view, with prominent elevations at the poles. Normally seen in girdle view, often growing in zig-zag chains attached to filamentous seaweeds, etc. Often found also in inshore plankton samples. Plastids numerous, discoidal. A very common marine genus but taxonomically extremely confused (see below). Valves bipolar/lanceolate to almost circular, often with waxy margins. Valves surface often furrowed with various thickenings, spines (often conspicuous in the central region) or ridges. Apices bearing rounded pseudocelli on low or extended elevations. Valve mantle not well-defined but extreme edge of valve often recurved and variously moulded. Areolae large with perforate vela of the cribrum type. Simple pores also occur occasionally in the valve framework. Internally with conspicuous plain ridge (pseudosepta) beneath the external indentations of the valve. One to several rimoportulae present, sessile, clustered in centre; external tubes often stout and surmounted by two spines. Cingula with a complete, close valvocopula and 3-4 split copulae; areolae large, in rows; fluting of girdle corresponding to that of valve edge.

The most recent alteration to this page was made on 10 Jan 2020 by Wendy Guiry.

Comments: Ross & Sims (1971) concluded that several species of Triceratium also belong in Biddulphia but these we have not investigated. At the moment the best practice seems to be to distinguish groups of species which clearly fall into genera where the type species is well defined. Biddulphia has well-defined pseudocelli, cribra, marginal external ridges, internal pseudosepta and central rimoportulae. The genus includes B. biddulphiana, B. regina and B. tuomeyi. Other species formerly in Biddulphia have been transferred to Odontella, Pleurosira, Biddulphiopsis, etc. Hoban (1983) provides further detail of the type species together with a discussion of the family limits within the confused group of 'biddulphioid' forms.

Numbers of names and species: There are 369 species names in the database at present, as well as 127 infraspecific names. Of the species names, 54 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.

Roper, F.C.S. (1859). On the genus Biddulphia and its affinities. Transactions of the Microscopical Society of London 7: 1-24, pl. 1-2.

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 2020 by Wendy Guiry

Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=44312

Citing AlgaeBase
Please cite this record as:
Wendy 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 06 May 2021.

SITE © 1996 - 2021 M.D. Guiry. All rights reserved.

Website Design : 249 Design Studio