Hannaea pamirensis Glushchenko, Kulikovskiy, Q.Liu & Kociolek, 2019

Liu, Qi, Glushchenko, Anton, Kulikovskiy, Maxim, Maltsev, Yevhen & Kociolek, John Patrick, 2019, New Hannaea Patrick (Fragilariaceae, Bacillariophyta) species from Asia, with comments on the biogeography of the genus, Cryptogamie, Algologie 20 (5), pp. 41-61 : 43-46

Hannaea pamirensis Glushchenko, Kulikovskiy, Q.Liu & Kociolek , sp. nov.

( Figs 4-6 )

HOLOTYPE. — Slide no 02547; illustrated in Fig. 4B in collection of Maxim Kulikovskiy at the Herbarium of the Institute of Plant Physiology Russian Academy of Science, Moscow, Russia.

TYPE LOCALITY. — Tajikistan, Pamir Mountains, Mountain pass Maisara (Kok-Bay), unnamed river, periphyton (37°28.269’N, 72°38.958’E).

ETYMOLOGY. — The specific epithet “ pamirensis ” refers to the name of the Mountain range where this species was observed.

DISTRIBUTION. — As yet known only from the type locality.

DESCRIPTION

Valves

Asymmetrical about the apical axis, weakly arcuate to almost linear with capitate to rostrate apices, length 42-45 µm, breadth 5.5-7.0 µm.

Axial area

Narrow, slightly expanded to the central part of valve.

Central area

Unilaterally tumid on the concave margin, large, with ghost striae. Striae parallel, 16.5-18.0 in 10 µm.

SEM, external views ( Fig. 5 )

Striae uniseriate, comprised of small, rounded areolae ( Fig. 5 B-D). Marginal spines flattened ( Fig. 5 ). Areolae number 75-80 /10 µm within a stria.

SEM, internal views ( Fig. 6 )

Striae are located alternatively on each side ( Fig. 6 ). On central area there are false striae ( Fig. 6B ). Areolae slit-shaped ( Fig. 6 B-F). Ocellimbi are present on both valve ends ( Figs 6 C-F). A single rimoportula on one end of valve ( Fig. 6A ) and comprised of two thickened strips of silica on either side of a slit-like opening ( Fig. 6 C-E). Rimportulae are located near the ocellimbi, oriented either perpendicularlyto the striae, Fig. 6E ) or laterally (oriented parallel to the striae; Fig. 6C, D ).

Figures

FIG. 4. — Hannaea pamirensis Glushchenko, Kulikovskiy, Q. Liu & Kociolek, sp. nov. LM, DIC. Valves views. Size diminution series. Type population (slide no 02547). D, Holotype. Scale bar: 10 μm.

FIG. 5. — Hannaea pamirensis Glushchenko, Kulikovskiy, Q. Liu & Kociolek, sp. nov. SEM. External views. White arrow shows the opening of the rimoportulae. Scale bars: A, 10 µm; B, C, 2 µm; D, 1 µm.

FIG. 6. — Hannaea pamirensis Glushchenko, Kulikovskiy, Q. Liu & Kociolek, sp. nov. SEM. Internal views. White arrows show the rimoportulae. Scale bars: A, 10 µm; B, F, 2 µm; C-E, 1 µm.