FIGURES 380–385. SEM micrographs of Achnanthidium pseudolineare Van de Vijver, Novais & Ector from Portela do Homem, Homem River, Cávado basin, 26-09-2007 (34/07). 380. Raphe valve in external view. 381. Raphe valve in internal view. 382. Rapheless valve in external view. 383. Rapheless valve in internal view. 384. Detail of a raphe valve in external view, with the straight, not expanded, proximal pores and distal ending. The elongated, mostly slit-like areolae on the mantle are clearly visible. 385. Detail of a raphe valve in internal view, with the straight raphe ending, terminating in a small helictoglossa. Scale bars = 1 μm.

Published as part of Novais, Maria Helena, Jüttner, Ingrid, Vijver, Bart Van De, Morais, Maria Manuela, Hoffmann, Lucien & Ector, Luc, 2015, Morphological variability within the Achnanthidium minutissimum species complex (Bacillariophyta): comparison between the type material of Achnanthes minutissima and related taxa, and new freshwater Achnanthidium species from Portugal, pp. 101-139 in Phytotaxa 224 (2) on page 124, DOI: 10.11646/phytotaxa.224.2.1, http://zenodo.org/record/13636829