Taxon Account

Karayevia Round & Bukhtiyarova ex Round; 1998; 354

Key references

Round F.E., Bukhtiyarova L. 1996. Four new genera based on Achnanthes (Achnanthidium) together with a re-definition of Achnanthidium. Diatom Research. 11(2): 345-361.

Bukhtiyarova, L. N. 2006. Additional data on the diatom genus Karayevia and a proposal to reject the genus Kolbesia. Nova Hedwigia:. 85-96.

Morphology

Frustules slightly to moderately bent in girdle view with a raphe system only on one valve (monoraphid); linear, lanceolate or elliptical in valve view, with broadly rostrate or scarcely rostrate apices; girdle narrow, so that cells most often lie in valve view.

Frustules heterovalvar, isopolar, bilaterally symmetrical; bent in girdle view, with the raphe valve on the ‘inside’ of the bend; the raphe valve and pseudoraphe valve are differently patterned.

Striae uniseriate, radial (less so in the pseudoraphe valve), coarse in many species (relative to the small size of the valves in this genus); areolae circular to transapically elongate in the raphe valve, circular in the pseudoraphe valve; occluded by fine pore plates (hymenes).

Axial area narrow and linear, or broader and lanceolate. Central area not differentiated from the axial area in either type of valve.

Raphe straight, bordered externally by a narrow groove on either side; external central endings slightly expanded; internal central endings straight, coaxial; terminal fissures turned to the same side.

Girdle structure unknown.

A single chloroplast per cell, lying against one side of the girdle and one valve.

Literature

References are given in chronological order.

Reference
Citation
Round F.E., Bukhtiyarova L. 1996. Four new genera based on Achnanthes (Achnanthidium) together with a re-definition of Achnanthidium. Diatom Research. 11(2): 345-361. Description; Taxonomy; Morphology;
Round F.E. 1998. Validation of some previously published "achnanthoid" genera.181. Diatom Research. 13(1): 181. Taxonomy
Bukhtiyarova, L. N. 2006. Additional data on the diatom genus Karayevia and a proposal to reject the genus Kolbesia. Nova Hedwigia:. 85-96. ; Illustrations; Morphology; Taxonomy
This page should be cited as:

Mann D. G. Karayevia Round & Bukhtiyarova ex Round; 1998; 354. 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=3649. [Accessed:  ].

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Record last modified: 03/04/2021