A morphological investigation of Neidium temperei Reimer (Bacillariophyta), and a consideration of its systematic placement

Valve morphology of three species of Neidiomorpha (Bacillariophyceae) from Zoigê Wetland, China, including description of Neidiomorpha sichuaniana nov. sp.

“…The diagnosis of Neidium, as typified by N. affine (Ehrenberg) Pfitzer (1871: 39), was recently emended by Hamilton and Jahn (2005) to only include species with a suite of features such as longitudinal canals, renilimbi, lacinia and external proximal raphe ends recurved in opposite directions. Kavulic and Kociolek (2014) generated a cladistics analysis that included the two Neidiomorpha species, 'typical' Neidium species, as well as several Neidium species with suites of features that are necessary but not sufficient for inclusion in Neidium, such as N. temperei Reimer (1959: 33), N. holstii (Cleve) Krammer in Krammer & Lange-Bertalot (1985: 106) and N. dubium (Ehrenberg) Cleve (1894: 70). Kavulic and Kociolek (2014) suggested that Neidiomorpha is non-monophyletic, and that based on the emended diagnosis for Neidium, there are species that fit in neither genus as presently circumscribed.…”

“…Kavulic and Kociolek (2014) generated a cladistics analysis that included the two Neidiomorpha species, 'typical' Neidium species, as well as several Neidium species with suites of features that are necessary but not sufficient for inclusion in Neidium, such as N. temperei Reimer (1959: 33), N. holstii (Cleve) Krammer in Krammer & Lange-Bertalot (1985: 106) and N. dubium (Ehrenberg) Cleve (1894: 70). Kavulic and Kociolek (2014) suggested that Neidiomorpha is non-monophyletic, and that based on the emended diagnosis for Neidium, there are species that fit in neither genus as presently circumscribed. Relationships of those species suggest they may each need to be accommodated into new, separate genera, for all of them to be monophyletic.…”