Muelleria islandica (Østrup) Lange-Bert. Muelleria islandica (Østrup) Lange-Bert. in Iconogr. Diatomol. 6: 63. 19991is new combination for Navicula islandica Østrup1. (Basionym:) fig. 3:36 non Navicula islandica Grunow in Cleve & Möller 1881 no. 262