PT Journal
AU Juttner, I
   Wetzel, EC
   Van de Vijver, B
   Levkov, Z
   Chudaev, D
   Williams, MD
   Ector, L
TI Investigation of the type material of Microneis gracillima, Navicula pyrenaica, Achnanthes amphicephala, Achnanthes thienemannii and Achnanthidium rostropyrenaicum (Achnanthidiaceae, Bacillariophyta) and additional populations of the species
SO Fottea
PY 2023
BP 122
EP 140
VL 23
IS 1
DI 10.5507/fot.2022.015
DE Achnanthidium; distribution; indicators; morphology; oligotrophy; type material
AB The historic type material of Microneis gracillima, Navicula pyrenaica, Achnanthes amphicephala, Achnanthes thienemannii and Achnanthidium rostropyrenaicum was investigated together with additional European populations of these species using light and scanning electron microscopy. The morphology of the species was compared to similar taxa. Achnanthes amphicephala is transferred to the genus Achnanthidium. The species are distinguished from each other in the shape of their poles and in valve outline. There are currently very few photographic records of the species, but our results suggest that these species are typical in base-rich, oligotrophic waters, and might be important indicator species for these habitats.
ER