Detonula F.Schütt ex De, 1894
Holotype species: Detonula pumila (Castracane) Gran
Original publication and holotype designation: De Toni, G.B. (1894). Sylloge algarum omnium hucusque cognitarum. Vol. II. Bacillariaeae. Sect. III. - Cryptorhaphideae. pp. [i-vi], 819-1556. Patavii [Padua]: Sumptibus auctoris.
Taxonomic status: currently recognized as a distinct genus.
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: -119, 39 pls.
According to CAS "The name was published by F. Schütt in Engler & Prantl 1896 (ref. 001512), p. 83 for a section of Lauderia, with a single species, Lauderia pumilla Castracane 1886. Entry in Round, Crawford & Mann (1990), p. 142 ("Detonula Schütt 1894, Rep. Sci. Voy. 'Challenger', Bot. 2: 89, 1880. T: D. pumila (Castracane) Schütt (= Lauderia pumila)"), is incorrect; it refers probably to Castracane 1886 (ref. 000193), where the genus Lauderia is discussed p. 89 without mention of the name Detonula.. The genus name was validly published by De Toni 1894, p. 1425, who provided a generic description. No species were listed by De Toni for this genus." - (19 Oct 2011) - M.D. Guiry
Description: Cells barrel-shaped, connected by short processes and mucilage threads into long filaments. Plastids numerous, discoid. Originally all the species were placed in Lauderia but see the discussion in Hasle (1974a) who recognised D. confervacea, D. pumila (we illustrate only this species) and D. moseleyana. A fairly common marine planktonic genus sometimes forming blooms in coastal waters. Valves saucer-like with radiating costae between which small areolae occur; near the centre these are more-or-less round but they become elongate halfway to the margin. A central fultoportula (occasionally two) occurs with a short simple exit tube through which a thread of polysaccharide is produced connecting the valve to its sibling. Around the edge of the valve face there is a ring of fultoportulae, their exit tubes having conspicuous upright flanged extensions. Adjacent cells interlock by means of these flanges. A single plain exit tube of a rimoportula is found in the circumferential ring (arrow). Internally the central fultoportula may appear raised and has a variable number of buttresses. The fultoportulae in the circumferential rings are low structures internally, usually with 4 buttresses. The internal part of the rimoportula is much larger and usually lies at right angles to the valve margin. Copulae numerous, all split with ligulae. The distal one in Hasle's fig. 74 of D. pumila is plain, but otherwise they are porous, each bearing several transverse rows of areolae. Resting spores occur and are more coarsely silicified spiny versions of the vegetative cells (see Hasle, 1974a, for illustrations).The most recent alteration to this page was made on 7 Dec 2015 by M.D. Guiry.
Comments: The genus is distinguished from Lauderia by the absence of valve face spines. Hasle (1973a) considers there is no justification for retaining Pavillard's name Schroederella.
Numbers of names and species: There are 7 species names in the database at present, of which 4 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):
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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: 07 December 2015 by M.D. Guiry
Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=44387
Please cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2020. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 14 August 2020.