Biddulphia S.F.Gray, 1821
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, - 824, pls I-XXI plates. London: Printed for Baldwin, Cradock & Joy, Paternoster-Row.
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].
Description: The valves in this genus are typically bipolar with relatively short and squat apices, each bearing a pseudocellus Valves are undulate in shape, in both valve and girdle views. A continuous to semi-continuous marginal ridge is sometimes present at the interface of the valve mantle and valve face. Large, porose areolae are occluded by cribra; areolae often bordered by a thick rim, sometimes with a spine present on the rim. Interstitial pores, smaller and without rims, present on the valve, scattered between areolae. Rimoportulae are found on the central elevation and take the form of a hollow tube externally and a slit across a small papillus internally. Some species (B. biddulphiana) may also have several other hollow external tubes on the central elevation which do not correspond to rimoportulae (Tiffany, 2015). Valve interior costate. Costae vary in form, ranging from transverse costae to short, branching costae. The base of the mantle is constricted, the valve margin forms a hyaline flange. Copulae open, with porose areolae. The valvocopulae often have “clasping” fossa which correspond to the costae of the valve. Taxa in this genus range from the Oligocene, possibly late Eocene, to present day, with extant forms common but not numerous in temperate to tropical coastal habitats, though localized epiphytic blooms have been observed in B. biddulphiana. When observed, cells in colonies are typically joined by one pseudocellus. Numerous plastids per cell.
Information contributed by: Sims & al. 2022. The most recent alteration to this page was made on 2023-01-31 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 feminine.
Most recent taxonomic treatment adopted: Sims, P.A., Ashworth, M.P., Theriot, E.C. & Manning, S.R. (2022 '2023'). Molecular and morphological analysis of Biddulphia sensu lato: a new diagnosis of Biddulphia, with a description of the new genera Biddulphiella and Neobrightwellia. Marine Micropaleontology 178(102186): 1-21, 21 figs.
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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=44312
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 31 January 2023. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 08 December 2023