(ofChaetoceros externus Gran, 1897)Gran, H.H. (1897). Protophyta: Diatomaceae, Silicoflagellata and Cilioflagellata. Den Norske Nordhavs-Expedition 1876-1878. Botanik. Christiana, Grøndahl & Søns, pp. 1-36, pl. 1-4. page(s): p. 25; pl. 3, fig. 44, 45 [details]
Kociolek, J.P.; Blanco, S.; Coste, M.; Ector, L.; Liu, Y.; Karthick, B.; Kulikovskiy, M.; Lundholm, N.; Ludwig, T.; Potapova, M.; Rimet, F.; Sabbe, K.; Sala, S.; Sar, E.; Taylor, J.; Van de Vijver, B.; Wetzel, C.E.; Williams, D.M.; Witkowski, A.; Witkowski, J. (2025). DiatomBase. Chaetoceros anastomosans var. externus (Gran) Hustedt, 1930. Accessed at: https://www.diatombase.org/aphia.php?p=taxdetails&id=162998 on 2026-09-04
original description(ofChaetoceros externus Gran, 1897)Gran, H.H. (1897). Protophyta: Diatomaceae, Silicoflagellata and Cilioflagellata. Den Norske Nordhavs-Expedition 1876-1878. Botanik. Christiana, Grøndahl & Søns, pp. 1-36, pl. 1-4. page(s): p. 25; pl. 3, fig. 44, 45 [details]
basis of recordHällfors, G. (2004). Checklist of Baltic Sea Phytoplankton Species (including some heterotrophic protistan groups). <em>Baltic Sea Environment Proceedings.</em> No. 95: 210 pp., available online athttp://helcom.fi/Lists/Publications/BSEP95.pdf[details] Available for editors [request]
new combination referenceSchmidt, A. (1921). Atlas der Diatomaceen-kunde. Leipzig. O.R. Reisland, Series VIII(Heft 86): pls. 341-344 page(s): pl. 341, fig. 2, 3 [details]
Present Inaccurate Introduced: alien Containing type locality