New and poorly known “araphid” diatom species (Bacillariophyta) from regions near Lake Titicaca, South America and a discussion on the continued use of morphological characters in “araphid” diatom taxonomy

A–V LM images of little known and new “araphid” diatoms from the Bolivian Altiplano A–D Pseudostaurosira vulpina stat. nov. E–I P. frankenae sp. nov. (Fig. 6E is the holotype) J–O P. occulta sp. nov. (Fig. 6K corresponds to the holotype) P–V P. oblonga sp. nov. (Fig. 6R corresponds to the holotype). Scale bar: 10 µm.