Caloneis Cleve, 1894

Lectotype species: Caloneis amphisbaena (Bory) Cleve

Original publication: Cleve, P.T. (1894). Synopsis of the naviculoid diatoms. Part I. Kongliga Svenska Vetenskapsakademiens Handlingar Series 4 26(2): 1-194, 5 pls.

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Type designated in: Boyer, C.S. (1927). Synopsis of North American Diatomaceae, Supplement, Part 2. Naviculatae, Surirellatae. Proceedings of the Academy of Natural Sciences of Philadelphia 79: 229-583.

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Description: Cells solitary, naviculoid. Valves usually linear-lanceolate to elliptical, sometimes with capitate or rostrate poles and sometimes with undulate margins. Valve face flat or curving smoothly into relatively deep mantles. Axial and central areas variable in shape. Terminal fissures of the raphe are usually distinct. Striae basically multiseriate but usually also chambered. The outer wall of the chambers (alveoli) perforated by many rows of small, round poroids occluded by hymenes. The poroids are usually invisible in the light microscope. The inner wall of each alveolus typically opens to the inside of the valve by one fairly large, transapically elongate aperature. The inner aperatures usually located in approximately the same place on each alvelus, thus giving the appearance of one or several longitudinal lines crossing the striae on both sides of the axial area. The girdle consists of a few open bands. Caloneis has been reported from fresh, brackish and marine waters. Because the structure of Caloneis is so similar to that of Pinnularia, some researchers (e. g., Round and others, 1990) have included Caloneis within Pinnularia. Traditionally, the genera have been separated by the shape of their alveoli. The alveoli of Caloneis are usually thinner and denser than those of Pinnularia.

Information contributed by: M. C. Amspoker. The most recent alteration to this page was made on 2020-08-24 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: Hofmann, G., Werum, M. & Lange-Bertalot, H. (2013). Diatomeen im Süßwasser—Benthos von Mitteleuropa. Bestimmungsflora Kieselalgen für die ökologische Praxis. Über 700 der häufigsten Arten und ihre Ökologie. pp. [1]-908, 133 pls. Königstein: Koeltz Scientific Books.

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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.

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M.D. Guiry in Guiry, M.D. & Guiry, G.M. 24 August 2020. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway.; searched on 17 June 2024

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