Taxon Account

Meridion circulare (Greville) Agardh; 1831; 40

Key references

Williams D.M. 1985. Morphology, Taxonomy and Inter-Relationships of the Ribbed Araphid Diatoms from the Genera Diatoma and Meridion (Diatomaceae: Bacillariophyta). Bibliotheca Diatomologica Vol. 8, J. Cramer, Vaduz. 228 pp.; 27 pls.

Morphology

Shape
Valves clavate, wedge-shaped in girdle view.

Symmetry
Heteropolar, bilaterally symmetrical.

Axial area
Narrow, linear.

Other features
Prominent transapical ribs.


SEM morphology
Small spines can be located along the valve margin.

Uniseriate, unevenly spaced striae with round, occluded external areola openings.

A large transapically elongated rimoportula near the head pole.

A pore field is present at the foot pole.

Literature

References are given in chronological order.

Reference
Citation
Agardh C.A. 1831. Conspectus Criticus Diatomacearum. Part 3. Lundae. Litteris Berlingianis. 33-48. Morphology; Taxonomy; Description
Ralfs, J. 1843. On the British species of Meridion and Gomphonema. The Annals and Magazine of Natural History. 12: 457-467. Morphology
Williams D.M. 1985. Morphology, Taxonomy and Inter-Relationships of the Ribbed Araphid Diatoms from the Genera Diatoma and Meridion (Diatomaceae: Bacillariophyta). Bibliotheca Diatomologica Vol. 8, J. Cramer, Vaduz. 228 pp.; 27 pls. Morphology; Taxonomy; Illustrations;
Rhode K.M., Pappas J.L., Stoermer E.F. 2001. Quantitative analysis of shape variation in type and modern populations of Meridion Ag. Journal of Phycology. 37: 175-183. Morphology; Type Illustration
This page should be cited as:

Williams D. M., Jüttner I. Meridion circulare (Greville) Agardh; 1831; 40. In: Jüttner I., Carter C., Chudaev D., 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=2421. [Accessed:  ].

Image Gallery

Record last modified: 27/12/2020