Achnanthidium anatolicum C.N.Solak, Wojtal, S.Blanco, Peszek & M.Rybak, 2022

Solak, Cueneyt Nadir, Wojtal, Agata Zofia, Peszek, Lukasz, Rybak, Mateusz, Yilmaz, Elif, Gastineau, Romain & Blanco, Saul, 2022, Three new Achnanthidium (Bacillariophyceae) species from Lake Salda (Anatolia, Turkey), a deep soda lake, Plant Ecology and Evolution 155 (2), pp. 221-235 : 221

Achnanthidium anatolicum C.N.Solak, Wojtal, S.Blanco, Peszek & M.Rybak sp. nov.

Figs 8 , 9 , 10

Type.

TURKEY • Lake Salda ; 37°33 ’37.88” N, 29°43 ’1.94” E; 1316 m a.s.l.; 16 Nov. 2019; Cüneyt Nadir Solak; holotype: slide n° 27306, illustrated here in Fig. 8H & V : deposited in the collection of Andrzej Witkowski at the University of Szczecin, Poland; isotype: slide n° TR_BDR_ Salda Lake _ Nov2019 _EPL_3: deposited at Kütahya Dumlupınar University, Turkey .

Description.

Valves linear, inflated in the centre. Apices subcapitate (Fig. 8 ). Valve dimensions (n = 34): valve length 11.5-23.0 µm, valve width 2.5-3.5 µm (Table 2 ). Raphe valve (Figs 8A, C-P & 9A-H ) with almost straight margins, especially in larger valves (Figs 8C & 9A ). Striae in the central area more widely spaced. Striae mainly composed of 4-5 rounded to rectangular areolae (Fig. 9B-D ). Externally, raphe straight, filiform, with slightly expanded central endings and terminal raphe fissures (Fig. 9A-D ). Internally, central raphe endings slightly deflected into opposite directions. Terminal raphe endings terminating onto small helictoglossae (Fig. 9E-H ). Transapical striae radiate throughout the entire valve, more densely spaced towards the apices, 26-28 per 10 µm. Rapheless valve (Figs 8B, Q -AD & 10A-D) bordered by 3-4 more widely spaced striae on one or both sides (Fig. 10A, B ). Striae radiate throughout the entire valve, more densely spaced towards the apices, 27-29 per 10 µm. Central area almost absent with 2-4 isolated striae. Striae mainly composed of 4-5 rounded areolae (Fig. 10A-D ). On both valves, one row of single elongated areolae present on the mantle, separated from the striae on valve face by hyaline area (Fig. 10A ).

Etymology.

The species name refers to the geographic region Anatolia (Latin adjective: anatolicus) in Western Turkey where Lake Salda is located.

Figures

Figure 8. Achnanthidium anatolicum sp. nov., LM micrographs. A, C - P. Views of raphe valves. B, Q - AD. Views of rapheless valves. Scale bar = 10 µm (A, B: 2500 x; C-AD: 1000 x magnification).

Figure 9. Achnanthidium anatolicum sp. nov., SEM micrographs. A. General external valve view of a raphe valve. B. Details of central area. C, D. Details of apices. E. General internal valve view of a raphe valve. F. Details of central area. G, H. Details of apices. Scale bars 10 µm (A, E), 2 µm (B-D, F-H).

Figure 10. Achnanthidium anatolicum sp. nov., SEM micrographs. A. General external view of rapheless valve. B. Details of central area. C, D. Details of apices. Scale bars 10 µm (A), 4 µm (C, D), 2 µm (B).