Timaviella dunensis Mikhailyuk & O. M. Vynogr. 2022
- Dataset
- Timaviella dunensis sp. nov. from sand dunes of the Baltic Sea, Germany, and emendation of Timaviella edaphica (Elenkin) O. M. Vynogr. & Mikhailyuk (Synechococcales, Cyanobacteria) based on an integrative approach
- Rank
- SPECIES
- Published in
- Mikhailyuk, Tatiana, Vinogradova, Oksana, Holzinger, Andreas, Glaser, Karin, Akimov, Yuri, Karsten, Ulf (2022): Timaviella dunensis sp. nov. from sand dunes of the Baltic Sea, Germany, and emendation of Timaviella edaphica (Elenkin) O. M. Vynogr. & Mikhailyuk (Synechococcales, Cyanobacteria) based on an integrative approach. Phytotaxa 532 (3): 192-208, DOI: 10.11646/phytotaxa.532.3.1
Classification
- kingdom
- Bacteria
- phylum
- Cyanobacteria
- class
- Cyanophyceae
- order
- Synechococcales
- family
- Oculatellaceae
- genus
- Timaviella
- species
- Timaviella dunensis
description
Description: Thallus radially spreading, expanded, leathery, brownish, dark olive, blue-green to light greenish. Filaments long, variously curved, (3.0) 3.8 - 4.9 (6.0) μm wide. False branching rare, mostly double. Sheath colourless, firm, thick. Trichomes slightly constricted at cross-walls, occasionally becoming almost biseriate due to oblique division and compression of cells, 2.2 – 3.3 μm wide. Cells cylindrical, isodiametric to longer than wide, with parietal thylakoids, 2.2 – 3.5 μm long. End cells rounded to conical. Necridia in both young and senescing trichomes, hormogonia rare. D 1 - D 1 ’ helix 85 nucleotides long, with a 3 ’ unilateral bulge at position – / 73 - 80, five internal loops at position 10 / 68, 14 - 15 / 63 - 64, 20 / 58, 23 / 54 - 55 and 31 / 46. Terminal loop having sequence 5 ’ - UCUC- 3 ’. Box B helix 48 nucleotides long, with several assymetrical internal loops at position 6 / 41 – 42, 9 – 10 / 39 and – / 30 – 32. Terminal loop 5 nucleotides long, 5 ’ - AUAAU- 3 ’. V 2 helix 10 nucleotides long, terminal loop 4 nucleotides, 5 ’ - AUUA- 3 ’. V 3 helix 60 nucleotides long, with several internal loops at positions 4 / 53 – 55, 9 – 10 / 47 – 50 and 23 / 34. Terminal loop having sequence 5 ’ - GAAA- 3 ’.
diagnosis
Diagnosis: Morphologically and ecologically similar to T. edaphica differing in the colorless sheath, wider filaments and trichomes, conical end cells, longer Box-B and D 1 - D 1 ’ helices; structure of V 3 helix in the position 9 - 50 and of basal stem and terminal loop in V 2. Differs from T. circinata in Box-B and V 3 helices length, the structure in the D 1 - D 1 ’, Box-B and V 3 helices, as well as the color of thallus, rare false branching, wider trichomes, parallel thylakoids and presence of necridia.
etymology
Etymology: Named for its occurrence in biocrusts on dunes; dunensis (L) = of dunes.
materials_examined
Holotype here designated: KW-A- 32531, Algotheca, Herbarium of the M. G. Kholodny Institute of Botany of the National Academy of Sciences of Ukraine (KW), Kyiv, Ukraine. Reference strain: Us- 6 - 3 was deposited at the German Collection for Microorganisms and Cell Cultures (DSM 112875), Braunschweig, Germany, as well as at culture collection of the M. G. Kholodny Institute of Botany of the National Academy of Sciences of Ukraine (IBASU-A- 754). Type locality: The coast of the Baltic Sea, Usedom Island, vicinity of Zempin, Germany, 54 ° 04 ′ 17 ″ N 13 ° 58 ′ 04 ″ E, collected on 8 October 2013 by Tatiana Mikhailyuk. Sand dunes, biocrusts with dominance of cyanobacteria and streptophyte algae.