Navicula islandica Østrup Navicula islandica Østrupis basionym for Muelleria islandica (Østrup) Lange-Bert. in Iconogr. Diatomol. 6: 63. 199911. (Basionym:) fig. 3:36 non Navicula islandica Grunow in Cleve & Möller 1881 no. 262