Crawfordia P.A.Sims, J.Witkowski & E.A.César, 2021

Holotype species: Triceratium hardmanianum Greville

Currently accepted name for the type species: Crawfordia hardmaniana (Greville) P.A.Sims, J.Witkowski & E.A.César

Original publication and holotype designation: Sims, P.A., Witkowski, J. & César, E.A. (2021). Crawfordia gen. nov.: solving the riddle of Triceratium hardmannianum Grev. (Bacillariophyta). Nova Hedwigia, Beiheft 115: 205-221, 7 pls, 2 tables.

Fossil: 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: Valves triangular, frustules subrectangular in girdle view, connected in short chains or solitary. Valve face undulate, a trifolium at valve centre. Apices with small, barely raised elevations with or without linking spines. A well-developed hyaline marginal ridge lies between apices. Mantle shallow, hyaline or with a few rows of poroids. Areolae poroid, arranged in rows radiating towards valve centre. Prominent radiating costae present on valve face exterior, primary costae extending from midway along each margin to valve centre, secondary costae extending partway. Central area hyaline, large or very small with openings from rimoportulae at its margin. Girdle bands mostly hyaline with a single or double row of poroids. Valvocopula a closed band, attached to valve interior by small clasping devices.

Information contributed by: Original description.. The most recent alteration to this page was made on 2021-11-13 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.

Comments: Crawfordia differs from Entogoniopsis in having external costae in the form of primary and secondary costae and in having an extremely narrow mantle.

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Contributors
Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in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=53487

Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 13 November 2021. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 10 May 2024