| Catalogue of Diatom Names, On-Line Version, Updated 19 Sep 2011 |
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| Pinnularia protracta (Grunow in Cleve & Grunow) Mayer 1913, pl. 22, fig. 13 | |||
| Basionym | Navicula crucicula var. protracta Grunow in Cleve & Grunow 1880 | ||
| Status | Invalid | ||
| Published in | Mayer, A. 1913 [ref. 000551]. Die Bacillariaceen der Regensburgen Gewasser. Systematischer Teil. Berichte des naturwissenschaftlichen (fruher zoologisch-mineralogischen) Vereines zu Regensburg 14:364 pp., 30 pls. | ||
| Type | INA card not found. Click here to check this name in the INA website. | ||
| Collector | Assessment of record accuracy | uncertain/not verified | |
| List of nomenclatural synonyms | Navicula crucicula var. protracta Grunow in Cleve & Grunow 1880 Navicula lundstroemii var. protracta (Grunow in Cleve & Grunow) Kolbe 1927 Navicula protracta (Grunow in Cleve & Grunow) Cleve 1894 Placoneis protracta (Grunow in Cleve & Grunow) Mereschkowsky 1903 | ||