Microworld

world of amoeboid organisms

Menu
Cocinocassis pontigulasiformis
C. pontigulasiformis, c, 60 µm large chamber – Tirol, Austria, stacked image

Conicocassis pontigulasiformis (Beyens et al., 1986) Nasser and Anderson, 2015

Diagnosis: 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: My measurements: Spherical chamber 60-66 µm in diameter (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 chamber about 66 µm – Tirol, Austria, stacked image
Centropyxis pontigulasiformis
About 66 µm – Tirol, Austria, stacked image.
Centropyxis pontigulasiformis
Spherical chamber about 60 µm – Tirol, Austria, stacked image
Centropyxis pontigulasiformis
Conicocassis 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
Recent posts

Apolimia

A. rotundistoma, from Korganova, 1987 Genus Apolimia Korganova, 1987 Diagnosis: Shell ovoid, quite large, opaque, round in cross section, densely covered with round or oval

Read More »

Erugomicula

E. bidens, 315 and 270 µm, Naardermeer, the Netherlands Genus Erugomicula Nasser, Gregory, Singer, Patterson and Roe, 2021 Typespecies: Erugomicula bidens (Penard, 1902) Diagnosis: laterally-compressed,

Read More »

Erugomicula bidens

Two shells from the same sample, 310 µm (Naardermeer, Netherlands) Erugomicula bidens (Penard, 1902) Basionym: Difflugia bidens Penard, 1902 Diagnosis: Test ovoid, compressed in cross-section,

Read More »

Cylindrothecina

Infraorder Cylindrothecina González-Miguéns et al., 2022   Diagnosis:  can be diagnosed by its specific sequences of the mitochondrial and nuclear DNA  markers (COI, NADH and

Read More »

Organic-walled species

Specimen with an optical cross-section of the peduncle (left) Organic-walled species Diagnosis: Multinucleated organic-walled monothalamous foraminifera. Test spherical to oval shaped, with a hyaline, flexible,

Read More »

Velamentofex tyrolensis

V. tyrolensis, two specimens Velamentofex tyrolensis Völcker and Clauß, 2020 April 2022, I found two specimens in a sample from the pond in Crailoo, Netherlands. I could

Read More »

Raphidiophrys spec. nov.

Raphidiophrys n. sp. Raphidiophrys n. sp. Diagnosis: Plate-scales canoe-shaped, elongated, with tapering, rounded poles, slightly curved upwardly. Light microscopically, these plate-scales show a clear rim;

Read More »

Lacogromia spec. Naardermeer

Lacogromia sp., Naardermeer, the Netherlands, 2022 (n=nucleus) Lacogromia sp. Six living specimens were found in an old sediment sample from a freshwater ditch in nature

Read More »

Sphenoderia rhombophora

S. rhombophora , after Bonnet, 1966 Sphenoderia rhombophora Bonnet, 1966 Diagnosis: Test hyaline, ellipsoidal, very slightly compressed. Fundus relatively narrow. Pseudostome largely truncated. Neck very

Read More »

Sphenoderia ovoidea

S. ovoidea , after Jung, 1942 Sphenoderia ovoidea Jung, 1942 Diagnosis: Shell with four layers of plate-scales. Distinguished from S. fissirostris by the ovoid tapering

Read More »