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Observations
| Observations: | Bart Van de Vijver |
|---|---|
| Length: | 43-70µm |
| Width: | 7,5-10,5µm |
| Striae: | 10-11 striae in 10µm |
Description:
Valves linear-lanceolate with slightly convex to parallel margins. The ends are wedge-shaped and acutely rounded (L 43-70µm, W 7,5-10,5µm, 10-11 striae in 10µm). Axial area narrow, linear, asymmetrically widening near the middle to form a fascia-like, rhomboidal central area. Raphe straight with rounded almost droplike central pores, close together. Terminal fissures clearly ?-shaped, easily resolvable in LM. The striae near the terminal raphe endings are shortening towards the apices. Transapical striae strongly radiate in the middle, changing direction towards the poles. No longitudinal lines.
| Morphology: | Naviculoid |
|---|---|
| Distribution: |
Autecology:
Notes:
Vallée des Branloires, Ile de la Possession, Crozet Archipelago, sample BA070 (coll. date 28/11/1999).Fairly common in very wet (moisture >80%) acid soils with higher specific conductance values and higher chloride-concentrations. Less common in water habitat and mosses.Probably also present on Kerguelen but due to some confusion with the nominate species not clearly examined. On the Antarctic Peninsula (Van de Vijver & Beyens 1997b) a similar form was found. Further analysis should clarify whether we are dealing with the same species.This species resembles clearly Pinnularia brebissonii but can easily be distinguished by the longer but narrower specimens, the less acute apices and the striae that clearly diminish in size towards the apices. Therefore we consider these populations to represent truly a new species. In Van de Vijver & Beyens (1998b, 1999a, 1999b) this species was split over the two former morphotypes 1 and 5 (following Krammer 1992) of P. brebissonii.
Other sites with Pinnularia crozetii
- Ile de la Possession (moist habitats), Crozet Archipelago
Original Type Description
| Author: | Van de Vijver & Le Cohu |
|---|---|
| Length: | 43-70µm |
| Width: | 7,5-10,5µm |
| Striae: | 10-11 striae in 10µm |
Original Description:
Valves linear-lanceolate with slightly convex to parallel margins. The ends are wedge-shaped and acutely rounded (L 43-70µm, W 7,5-10,5µm, 10-11 striae in 10µm). Axial area narrow, linear, asymmetrically widening near the middle to form a fascia-like, rhomboidal central area. Raphe straight with rounded almost droplike central pores, close together. Terminal fissures clearly ?-shaped, easily resolvable in LM. The striae near the terminal raphe endings are shortening towards the apices. Transapical striae strongly radiate in the middle, changing direction towards the poles. No longitudinal lines.
New combination
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Citations
Index Nominum Algarum (INA):
- Original
- If an INA link is available, it will be shown above
- The INA is a bibliographic reference "card file" for algal taxonomy, containing nearly 200,000 names of algae (in the broad sense).
