Campylosira Grunow ex Van Heurck, 1885

Holotype species: Campylosira cymbelliformis (A.W.F.Schmidt) Grunow ex Van Heurck

Original publication and holotype designation: Van Heurck, H. (1885). Synopsis des Diatomées de Belgique. Texte. pp. 1-235. Anvers: Martin Brouwers & Co.

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Description: Cells narrowly rectangular in girdle view occurring in short filaments joined by interlocking capitate spines. Plastids unknown. A common marine benthic genus usually associated with sand grains and detritus, and often covered with mucilage. Frustules heterovalvar. Valves cymbiform, with polar elevations. One valve convex and the other either concave or straight (see Hasle et al. 1983). Areolae simple, round, irregularly spaced or in curved longitudinal striae on the valve face; there may be a small central circular or transverse area without areolae. Sternum absent. Apical ocelluli occur, turned outwards towards the ventral side of the valve and, on the separation valves, with a spine angled towards the valve centre. T- or Y-shaped linking spines arise within a line of areolae at the junction of valve face and mantle, becoming simpler near the valve apices where they cannot interlink. There is a small rimoportula in the centre, near the curved dorsal margin. The cingulum consists of four open copulae; the most abvalvar copula bears fine fimbriae according to Hasle et al. (1983). These workers also record separation valves in which the spines are simple, thus allowing fragmentation of the filaments.

The most recent alteration to this page was made on 2015-12-09 by M.D. Guiry.

Taxonomic status: This name is of an entity that is currently accepted taxonomically.

Most recent taxonomic treatment adopted: Nikolaev, V.A., Kociolek, J.P., Fourtanier, E., Barron, J.A. & Harwood, D.M. (2001). Late Cretaceous diatoms (Bacillariophyceae) from the Marca Shale member of the Moreno Formation, California. Occasional Papers of the California Academy of Sciences 152: 1-119, 39 plates.

Comments: Additional illustrations and comments are to be found in the extensive study of Cymatosiraceae by Hasle et al. (1983). Campylosira was one of the first genera to be described in this family and it is likely that many records (and of Cymatosira) are unreliable since they may refer to other, more recently described genera, e.g. Plagiogrammopsis. We thank the late Professor von Stosch for samples of the Cymatosiraceae.

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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=44367

Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 09 December 2015. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 26 September 2022

 
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