Microworld

world of amoeboid organisms

Menu
General morphology of Lacogromia cassipara. ah – hyaline peduncular sheath; p – peduncle; e – internal channel; g – granuloreticulopodia; n – nucleus; m – membrane; x – xenosomes; c – cap of adhering bunch of xenosomes.

Class Monothalamea Pawlowski et al. 2013

Diagnosis: Foraminifera with a single chamber (monothalamous) test with an organic or agglutinated wall.

Remarks: Monothalamid foraminifera are widely distributed in marine and brackish habitats. Some members of this class are found in freshwater, but are rare. The main reason is probably that light microscopically, these tests are difficult to detect between debris, despite their relatively large size (250 µm on average, but up to 1 mm). Usually, the amoebae extend their pseudopodial network up to several mm when kept in Petri dishes or in wet mounts in moist chambers. Then they can be easily detected with an inverted microscope, preferably with dark field illumination or phase contrast.

The following non-marine families are known both morphologically and genetically:

Lieberkuehniidae: Lieberkuehnia, Claparedellus
Edaphoallogromiidae: Edaphoallogromia
Velamentofexidae: Velamentofex
Lacogromiidae: Lacogromia
Limnogromiidae: Limnogromia
Reticulomyxidae: Reticulomyxa, Haplomyxa, Dracomyxa, Wobo

Lacogromia cassipara, morphotype B; a adult specimen; b young specimens, just 24 hours after schizogony – drawing and micrograph Ferry Siemensma (1982)
Lacogromia cassipara, four young specimens, just 24 hours after schizogony (Siemensma, 1982)
Recent posts

Zivkovicia compressoidea

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,

Read More »

Zivkovicia flexa

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

Read More »

Lagenodifflugia epiouxi

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

Read More »

Centropyxis lapponica

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

Read More »

Chaos spec. 6

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.

Read More »

Bullinularia maxima

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

Read More »

Bullinularia macroporum

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

Read More »

Nebela golemanskyi

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

Read More »

Nebela nebeloides

N. nebeloides, after Gauthier-Lièvre and Thomas, 1958 Nebela nebeloides (Gauthier-Lièvre and Thomas, 1958) Todorov et al., 2010 Basionym: Difflugia nebeloides Gauthier-Lièvre and Thomas, 1958 Diagnosis:

Read More »