Centropyxis pontigulasiformis
C. pontigulasiformis, c. 60 µm large - Tirol, Austria, stacked image

 

 

Centropyxis pontigulasiformis Beyens, Chardez & De Bock, 1986

 

The shells are divided in a perfectly spherical body with an usually small circular aperture and a large, more or less funnel-like visor. The spherical part has a darker color than the visor; both parts are composed of granular organic cement, ornamented with some mineral grains and diatom frustules; the wall of the visor is relatively thin, with an outward curved veil. No living specimens were observed.

 

Dimensions: spherical compartment c. 60-66 µm large (n=18)

 

Ecology: peat bogs in het Hol and Laegieskamp, the Netherlands, Rotes Wasser, Germany and Tirol, Austria.

 

Remarks: This characteristic species resembles in structure Centropyxis species, but differs from that genus in the smooth spherical body and the large pronounced funnel-like conical visor.
I have found this species in the Netherlands in the seventies (see my drawings below) and in 2012, in samples from Tirol, Austria, where it also has been found by Angie Opitz (pers. comm.). She found living individuals. I found many specimens in a sample from the peatland area Rotes Wasser in Germany, sampled by Steffen Clauss.
The shells on this page have been photographed from material which has been collected in peat bogs in Tirol, Austria. The drawings are from material from the Netherlands.
The identity of these findings with C. pontigulasiformis as described by Beyens, Chardez and De Bock (1986) has been confirmed by Louis Beyens (pers. comm.)

 

Centropyxis pontigulasiformis
Spherical part about 66 µm - Tirol, Austria, stacked image
Centropyxis pontigulasiformis
About 66 µm - Tirol, Austria, stacked image.
Centropyxis pontigulasiformis
Spherical part about 60 µm - Tirol, Austria, stacked image
Centropyxis pontigulasiformis
Centropyxis pontigulasiformis - the aperture is clearly visible
Centropyxis pontigulasiformis
Centropyxis pontigulasiformis

 

I made this drawings in 1977 from samples from the Hol, the Netherlands. They show the variation in shape of the collar or visor.
Centropyxis pontigulasiformis
Centropyxis pontigulasiformis
From Laegieskamp
Centropyxis pontigulasiformis
Centropyxis pontigulasiformis

The photomicrographs below have been made by Angie Opitz, Tirol, Austria.

Centropyxis pontigulasiformis
Centropyxis pontigulasiformis
Centropyxis pontigulasiformis
Centropyxis pontigulasiformis
Centropyxis pontigulasiformis
Centropyxis pontigulasiformis
Centropyxis pontigulasiformis
Centropyxis pontigulasiformis