Phylum: Bacillariophyta  Family: Gomphonemataceae

Iconella biseriata (Brébisson) Ruck & Nakov

A benthic species of little known distribution in the Outer Hebrides

References: 
Ruck, et al. (2016) Phylogeny, ecology, morphological evolution, and reclassification of the diatom orders Surirellales and Rhopalodiales