Zivkovicia – Microworld

Zivkovicia compressa – drawing by Ferry Siemensma

Genus Zivkovicia Ogden, 1987

Diagnosis: Shell pyriform, often with a distinct constriction of the neck region, either circular or compressed in transverse-section, composed mainly of agglutinate mineral particles bound by an organic cement matrix; aperture terminal, usually circular; internally the shell is partitioned by two circular openings.

For the species described by Penard, look here.

Type species: Zivkovicia compressa (Carter, 1864)
Other species:

Zivkovicia spectabilis (Penard, 1902)
Zivkovicia flexa (Cash & Hopkinson, 1909)
Zivkovicia spiralis

Zivkovicia spec. with three openings

Z. spiralis – drawing Ferry Siemensma

Z. spectabilis

Ferry Siemensma
Created March 6, 2019
Last updated February 14, 2021

Zivkovicia compressoidea

July 24, 2021

Z. compressoidea, a-b after Chardez, 1958; c after Jung, 1942 Zivkovicia compressoidea (Jung, 1942) new.comb. Basionym: Pontigulasia compressoidea Jung, 1942 Diagnosis: Shell ovoid and compressed,

Zivkovicia flexa

July 24, 2021

Zivkovicia flexa, from Cash and Hopkinson, 1909 Zivkovicia flexa (Cash and Hopkinson, 1909) Ogden, 1983 Basionym: Pontigulasia compressa var. flexa Cash and Hopkinson, 1909 Diagnosis:

Lagenodifflugia epiouxi

July 19, 2021

L. epiouxi, after Chardez, 1984 3 Lagenodifflugia epiouxi (Chardez, 1983) new comb. Basionym: Pontigulasia epiouxi Chardez, 1983 Diagnosis: Shell elongate, circular in cross-section or very

Centropyxis lapponica

July 5, 2021

Centropyxis lapponica, after Grospietsch, 1954 Centropyxis lapponica Grospietsch, 1954 Diagnosis: Shell nearly circular in circumference, without spines. Aperture clear square with rounded corners. Shell viewed

Chaos spec. 6

June 28, 2021

Chaos spec., Crailoo, 2021 Chaos spec. This specimen was found in a samples from Crailoo, Netherlands. It was remarkable because of the absence of crystals.

Difflugia lanceolata parasitism

May 25, 2021

Difflugia lobostoma parasitism I found this Difflugia lanceolata specimen in 2021, in the mud of a shallow pond. A parasite is present in the posterior

Bullinularia maxima

May 24, 2021

Bullinularia maxima – from Bobrov and Mazei, 2020 Bullinularia maxima Bobrov et Mazei, 2020 Diagnosis: Shell brown, opaque, elliptical in ventral view; ventral surface is

Bullinularia macroporum

May 24, 2021

Bullinularia macroporum – from Bobrov and Mazei, 2020 Bullinularia macroporum Bobrov et Mazei, 2020 Diagnosis: Shell yellow-brownish, transparent, circular in ventral view; ventral surface is

Nebela golemanskyi

May 10, 2021

N. golemanskyi, after Todorov, 2010 Nebela golemanskyi Todorov, 2010 Diagnosis: Shell large, colourless and pyriform, with a distinct short neck about one fourth of the

Nebela nebeloides