Encyonopsis krammeri Reichardt

Kennedy, Bryan, Buckley, Yvonne & Allott, Norman, 2019, Taxonomy, ecology and analysis of type material of some small Encyonopsis with description of new species in Ireland, Phytotaxa 395 (2), pp. 89-128 : 113-117

publication ID

https://doi.org/ 10.11646/phytotaxa.395.2.5

DOI

https://doi.org/10.5281/zenodo.13717516

persistent identifier

https://treatment.plazi.org/id/05568795-FFF2-FF99-BA8C-D2C3D132F857

treatment provided by

Felipe

scientific name

Encyonopsis krammeri Reichardt
status

 

Encyonopsis krammeri Reichardt ( Figs 417–480 View FIGURES 417–448 View FIGURES 449–480 )

Description: Two different forms with differing apices are documented here. Valves are moderately dorsiventral and narrow-lanceolate in outline in the most widespread form. Dorsal margin is more clearly curved relative to the weakly convex ventral side, without shoulders. Poles are rostrate and may be weakly deflected ventrally, but variable in populations. Axial area very narrow and central area absent to weakly developed. Length 9.6–23.5 μm; width 2.6–3.8 μm; maximum L:W ratio 7.0.A more clearly capitate form with a near lanceolate outline ( Figs 461–472 View FIGURES 449–480 ) was found with type material of E. alpina and also occurs in calcareous lakes in Ireland. It shares the same ultrastructural combination of features as E. krammeri , including identical raphe design, a characteristic thin plate-like silica thickening visible internally between the helictoglossa and apices ( Fig. 442 View FIGURES 417–448 ; 479–480 View FIGURES 449–480 ) and transapically elongate linear shaped puncta. Striae density is higher (32–36 in 10 μm) in these populations than originally published for E. krammeri .

Ecology: A cosmopolitan and widespread diatom found in 31 lakes and reaching a maximum relative abundance of 43%. It occurs at higher densities in calcareous lakes in oligotrophic to mesotrophic conditions ( Fig. 532 View FIGURE 532 ).

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