Nitzschia austriaca, Hustedt NAUS, 1959

Földi, Éva Ács Angéla, Wetzel, Carlos E., Vad, Csaba F., Kiss, Keve T., Dobosy, Péter, Trábert, Zsuzsa, Grigorszky, István, Engloner, Attila & Ector, Luc, 2017, Nitzschia austriaca Hustedt: a characteristic diatom of Hungarian inland saline waters including a morphological comparison with the type material, Phytotaxa 308 (1), pp. 54-65 : 56

publication ID

https://doi.org/ 10.11646/phytotaxa.308.1.4

persistent identifier

https://treatment.plazi.org/id/039F8794-C66F-FFEC-FF70-FDA6989FB8C3

treatment provided by

Felipe

scientific name

Nitzschia austriaca
status

 

Comparison of Nitzschia austriaca valves from Apaj ( Hungary) and type material ( Austria)

The data of length, width, the number of striae and fibulae of the population from Apaj and of the type material overlapped with each other ( Table 1). A Mann-Whitney test showed that the medians of the striae and fibulae number were equal, but the width and lengths were not equal in the two studied populations. The results of NMDS also display that the metrics of both populations overlapped, which was also confirmed by the Shepard plot ( Fig. 1 View FIGURE 1 ). Based on these results, we argue that the species of the population from Apaj is the same as the type material of Nitzschia austriaca .

The length, width, number of striae and fibulae in 10 μm of Apaj populations and type material are available in Table 1. The shape of valves is sigmoid with slightly capitate ends ( Figs 2, 12 View FIGURES 2–13 , 20, 22 View FIGURES 20–24 ). Transapical striae are visible in LM ( Figs 2–13 View FIGURES 2–13 ). The fibulae are quite regularly distributed along the raphe canal, with the two median ones usually further apart from each other ( Figs 18, 19 View FIGURES 14–19 , 23, 24 View FIGURES 20–24 ). In SEM, externally: the striae are uniseriate and areolae are circular ( Figs 15 View FIGURES 14–19 , 21 View FIGURES 20–24 ). On the mantle, the striae are very short, comprising one areola ( Figs 14 View FIGURES 14–19 , 21 View FIGURES 20–24 ). The distal raphe endings turn always to the same side, either toward the valve face ( Figs 14 View FIGURES 14–19 , 20 View FIGURES 20–24 ) or the valve mantle ( Figs 16 View FIGURES 14–19 , 21 View FIGURES 20–24 ). Central raphe fissures are drop-shaped and close to each other, the proximal raphe end follows the valve margin ( Figs 15, 17 View FIGURES 14–19 , 20, 21 View FIGURES 20–24 ). Internally: areolae are not covered by hymenes ( Figs 19 View FIGURES 14–19 , 24 View FIGURES 20–24 ). The raphe slit is interrupted by a central nodule ( Figs 18 View FIGURES 14–19 , 24 View FIGURES 20–24 ). The distal raphe endings end in a helictoglossa ( Figs 19 View FIGURES 14–19 , 24 View FIGURES 20–24 ).

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Psocodea

Family

Menoponidae

Genus

Nitzschia

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