Diversity: the 'seminulum group'
Description
In the 'seminulum group', the valves are small,
from linear, lanceolate or elliptical. There are no
polar
bars. The axial
area is narrow, and
the central
area is
rectangular or rounded.
The axial area is not depressed and there is no
conopeum. In
LM there are no
grey areas or lines parallel to the raphe..
The small size of the valves (lengths generally < 20
µm) separates these species from most other Sellaphora species.
In addition, the absence of polar bars separates them from the
'bacillum group' and the 'pupula group', and the narrow axial area
separates them from the 'americana group'. There is no reason to think
that this is a natural group.
Species list
- Sellaphora
disjuncta (Hustedt) D.G. Mann
- Sellaphora
guyanensis Metzeltin
& Lange-Bertalot
- Sellaphora
hustedtii (Krasske) Lange-Bertalot & Werum in Werum &
Lange-Bertalot
- Sellaphora
joubaudii (H. Germain) Aboal in Aboal et al.
- Sellaphora
nana (Hustedt) Lange-Bertalot, Cavacini, Tagliaventi
& Alfinito
- Sellaphora
nanoides Lange-Bertalot, Cavacini, Tagliaventi &
Alfinito
- Sellaphora
sardiniensis Lange-Bertalot, Cavacini, Tagliaventi
& Alfinito
- Sellaphora
seminulum (Grunov) D.G. Mann
- Sellaphora
subantarctica Van de Vijver & Beyens in Van de Vijver,
Frenot & Beyens
- Sellaphora
tumida Van de Vijver & Beyens in Van de Vijver,
Frenot & Beyens
- Sellaphora
ventraloconfusa (Lange-Bertalot) Metzeltin
& Lange-Bertalot
- Sellaphora
verecundiae Lange-Bertalot in Lange-Bertalot
& Gerd Moser
- Sellaphora
vitabunda (Hustedt) D.G. Mann
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