Cavinula heterostauron

Taxon ID: 276
Author: Germain 1937   
Basionym: Navicula heterostauron



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LM image scalebar = 10 µm = pixels not measured     



Observations: Bart Van de Vijver
Length: 19-24µm
Width: 7-8µm
Striae: 24-26 striae in 10µm


Valves elliptic-lanceolate with sharp, slightly constricted ends (L 19-24µm, W 7 8µm, 24-26 striae in 10µm). Striae uniseriate with round areolae, strongly radiate near the central area, slightly radiate towards the poles. Axial area narrow, central area large forming an asymmetrical stauros. Striae (6-7) at one side in central area shorter, more spaced, lacking (or present in only highly reduced form) at the other side. Raphe filiform with central endings expanded, pore-like. Terminal fissures straight.

Morphology: Naviculoid




C. heterostauron is not common on Ile de la Possession. Most of the valves were found in relatively dry soils (moisture 35-50%) with slightly acid pH (6,1). In mosses and freshwater waterbodies, only a few valves were found.Kerguelen (Germain 1937, Bourrelly & Manguin 1954, Le Cohu & Maillard 1986).Cavinula lapidosa shows a similar valve outline but lacks the asymmetrical stauros and has more curved terminal raphe fissures. Therefore we suggest to keep C. heterostauron as a separate taxon.



Other sites with Cavinula heterostauron

  • Ile de la Possession (moist habitats), Crozet Archipelago

Original Type Description

Author: Germain 1937

Original Description:


New combination

Author: Van de Vijver



Index Nominum Algarum (INA):

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  • The INA is a bibliographic reference "card file" for algal taxonomy, containing nearly 200,000 names of algae (in the broad sense).

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