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Centropyxis pontigulasiformis
C. pontigulasiformis – Photomicrograph Louis Beyens

 

Conicocassis pontigulasiformis (Beyens, Chardez & De Bock, 1986) Nasser and Anderson, 2015
Centropyxis pontigulasiformis Beyens, Chardez & De Bock, 1986

Diagnosis:  shell formed of two distinct parts: the shell body, and a rather large semi-circular visor. The body is perfectly spherical and is perforated by a small circular aperture. The shell wall is composed of an organic matrix, incorporating fine plate-like polymorphous mineral particles. The visor which expands fan-like above and around the aperture, is mostly embossed with more voluminous quartz particles, in particular at the rim. Seen from an apertural view, this visor is as large as the shell body.

Dimensions: Beyens et al.: diameter of the shell 58-62 µm, length of the visor 24-28 µm (n=5); diam. of aperture 8-10 µm; total length 82-90 µm

Ecology: mosses and Sphagnum. Canadian and European (Svalbard) arctic, Northern Sweden (Chardez, 1990); My records: the Netherlands (‘t Hol, 1980, Laegieskamp, 2013), Germany (Rotes Wasser, 2017) and Austria (Tirol, Angie Opitz, pers. comm.).

References: Nasser, N.A., Patterson, T. (2015). Conicocassis, a new genus of Arcellinina (testate lobose amoebae). Palaeontologia Electronica 18.3.46A: 1-11.
palaeo-electronica.org/content/2015/1323-new-genus-of-arcellinia.

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