Denticula elegans (Kützing) Frenguelli; 1929; 391
Key references
Morphology
Shape
Linear or very slightly linear-lanceolate with rounded or slightly cuneate poles. Occasionally very slightly heteropolar.
Symmetry
Isopolar, bilaterally symmetrical.
Striae
Parallel and clearly punctate, uniseriate.
Axial area
Undetectable in LM
Central area
Absent
Raphe
Not visible in LM; its presence can be detected by the much more obvious subraphe canal located beneath the raphe. Since the raphe and subraphe canal are highly eccentric, being located at the junction getween the valve face and mantle; the subraphe canal lis detectable as a marked longitudinal line running parallel to the valve margin.
In a frustule, the raphe systems of the two valves lie on opposite sides ('nitzschioid symmetry').
The raphe is not interrupted at the centre, the raphe slit being continuous from pole to pole
Other features
Fibulae extend into prominent partitions, traversing the valve from one margin to the other, appearing as dark bars ('costae') in the light microscope.
The girdle contains half-bands (i.e. bands that run from one pole to the other, rather than being continuous around one pole and split at the other). The most advalvar half-bands (the two that together comprise the valvocopula) interlock with the transverse valve partitions, appearing to form caps over them in girdle views (see Figure)..
Linear or very slightly linear-lanceolate with rounded or slightly cuneate poles. Occasionally very slightly heteropolar.
Symmetry
Isopolar, bilaterally symmetrical.
Striae
Parallel and clearly punctate, uniseriate.
Axial area
Undetectable in LM
Central area
Absent
Raphe
Not visible in LM; its presence can be detected by the much more obvious subraphe canal located beneath the raphe. Since the raphe and subraphe canal are highly eccentric, being located at the junction getween the valve face and mantle; the subraphe canal lis detectable as a marked longitudinal line running parallel to the valve margin.
In a frustule, the raphe systems of the two valves lie on opposite sides ('nitzschioid symmetry').
The raphe is not interrupted at the centre, the raphe slit being continuous from pole to pole
Other features
Fibulae extend into prominent partitions, traversing the valve from one margin to the other, appearing as dark bars ('costae') in the light microscope.
The girdle contains half-bands (i.e. bands that run from one pole to the other, rather than being continuous around one pole and split at the other). The most advalvar half-bands (the two that together comprise the valvocopula) interlock with the transverse valve partitions, appearing to form caps over them in girdle views (see Figure)..
Literature
References are given in chronological order.
Reference |
Citation |
|---|---|
| Kützing F.T. 1844. Die Kieselschaligen Bacillarien oder Diatomeen. Fr. Fritsch, Nordhausen. 152 pp; 30 pls | Morphology; Description; Illustrations |
| Ettl H., Gärtner G. 1995. Syllabus der Boden-, Luft- und Flechtenalgen. Gustav Fischer Verlag, Stuttgart, Jena, New York. 721 pp. pp | Morphology; Ecology; Illustrations |
| Hartley B., Barber H.G., Carter J.R., Sims P.A. 1996. An Atlas of British Diatoms. Biopress Ltd., Bristol. 601 pp. | Illustrations |
This page should be cited as:
Mann D. G. Denticula elegans (Kützing) Frenguelli; 1929; 391. In: Jüttner I., Carter C., Cox E.J., Ector L., Jones V., Kelly M.G., Kennedy B., Mann D.G., Turner J. A., Van de Vijver B., Wetzel C.E., Williams D.M..
Freshwater Diatom Flora of Britain and Ireland. Amgueddfa Cymru - National Museum Wales. Available online at https://naturalhistory.museumwales.ac.uk/diatoms/browsespecies.php?-recid=4543. [Accessed:
].
Image Gallery
Record last modified: 27/12/2020