Tetracyclus glans (Ehrenb.) Mills; 1935; 1602
Synonymy
Tetracyclus lacustris Ralfs 1843
Key references
Williams D.M. 1987. Observations on the genus Tetracyclus Ralfs (Bacillariophyta) I. Valve and girdle structure of the extant species. British Phycological Journal. 22(4): 383-399.
Morphology
Size
25-80 (85) µm long, 15-40 µm wide (Williams 1987).
Shape
Valves with central inflation and rounded to slightly pointed apices.
Symmetry
Isopolar, bilaterally symmetrical.
Striae
Striae slightly curved, slightly radiate in the central part of the valve, radiate towards the valve ends; 20-26 in 10 µm (Williams 1987).
Axial area
Sternum central, narrow.
Other features
Transverse ribs 3-4 in 10 µm, most are primary, some secondary or tertiary.
SEM morphology
Apical pore field located on the mantle. Areolae of the striae more widely and irregularly spaced towards the sternum. Cingulum consisting of valvocopula, many copulae and a narrow pleura.
25-80 (85) µm long, 15-40 µm wide (Williams 1987).
Shape
Valves with central inflation and rounded to slightly pointed apices.
Symmetry
Isopolar, bilaterally symmetrical.
Striae
Striae slightly curved, slightly radiate in the central part of the valve, radiate towards the valve ends; 20-26 in 10 µm (Williams 1987).
Axial area
Sternum central, narrow.
Other features
Transverse ribs 3-4 in 10 µm, most are primary, some secondary or tertiary.
SEM morphology
Apical pore field located on the mantle. Areolae of the striae more widely and irregularly spaced towards the sternum. Cingulum consisting of valvocopula, many copulae and a narrow pleura.
Literature
References are given in chronological order.
Reference |
Citation |
|---|---|
| Mills F.W. 1935. An index to the genera and species of the Diatomaceae and their synonyms, 1916-1932. Part 21. Wheldon and Wesley, London. | Taxonomy |
| Williams D.M. 1987. Observations on the genus Tetracyclus Ralfs (Bacillariophyta) I. Valve and girdle structure of the extant species. British Phycological Journal. 22(4): 383-399. | Morphology; Type Illustration; Taxonomy |
| Michel T.J., Saros J.E., Interlandi S.J., Wolfe A.P. 2006. Resource requirements of four freshwater diatom taxa determined by in situ growth bioassays using natural populations from alpine lakes. Hydrobiologia. 568: 235-243. | Ecology |
This page should be cited as:
Jüttner I., Van de Vijver B., Williams D.M. Tetracyclus glans (Ehrenb.) Mills; 1935; 1602. 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=3476. [Accessed:
].
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Record last modified: 05/07/2022