Cosmarium margigranulatum, Costa & Ramos & Moura, 2023
|
publication ID |
https://doi.org/ 10.11646/phytotaxa.632.2.9 |
|
DOI |
https://doi.org/10.5281/zenodo.10438600 |
|
persistent identifier |
https://treatment.plazi.org/id/038F87B6-FFCE-FFD1-FF12-41D6FD8FFC68 |
|
treatment provided by |
Plazi |
|
scientific name |
Cosmarium margigranulatum |
| status |
sp. nov. |
Cosmarium margigranulatum F.M. Costa & C.W.N.Moura sp. nov. ( Figs. 3 View FIGURES 2–5 , 15–18 View FIGURES 6–18 )
Diagnosis: —Cells as long as broad, median constriction deep, sinus closed, linear; semicells reniform, smooth median face, angles rounded covered by granules, apex slightly projected with three protrusions; cell oblong in apical view. Cell dimensions: length 36.8–41.3 μm, breadth 41.6–44.6 μm, breadth of isthmus 12.7–16.2 μm.
Holotype:— Material numbered ( HUEFS 263036 View Materials !) [pro parte], deposited at the Herbarium of the State University of Feira de Santana, population partially illustrated here ( Figs. 3 View FIGURES 2–5 , 15–18 View FIGURES 6–18 ).
Paratypes:— Material numbered ( HUEFS 263040) [pro parte], deposited at the Herbarium of State University of Feira de Santana.
Type locality:— BRAZIL. Bahia: Camaçari, Camaçari-Mirim River, Lat. 12°42’23.1’’ S, Long. 38°15’27.2’’ W, 29 November 2019, F. M. Costa & J. T.X. Neto s/n ( HUEFS 263036).
Habitat:— Periphytic on Eleocharis acutangula ; water conductivity 0.04 mS. cm-1 (± 0.01); dissolved oxygen 7.6 mg.L- 1 (± 0.1); pH 7.3 (± 0.9); total dissolved solids 0.02 ppt (± 0.01); water temperature 28.3 ºC (± 1.3).
Etymology:— The specific epithet refers to the ornamentation composed of various granules located at the margins of semicells.
Differential diagnosis:— Cosmarium margigranulatum differs from the other species of Cosmarium by having a very distinct ornamentation: concentrated granules along the margins of the semicells, but lacking in the central region.
Morphologically, the newly described species resembles Cosmarium ornatum var. pseudolagoense Förster (1964: 399) . However, this latter variety differs by having a concentric ring of granules on the face of the semicells and short spines at the angles of the semicells.
| HUEFS |
Universidade Estadual de Feira de Santana |
| F |
Field Museum of Natural History, Botany Department |
| M |
Botanische Staatssammlung München |
| J |
University of the Witwatersrand |
| T |
Tavera, Department of Geology and Geophysics |
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.