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Phylum Foraminifera d’Orbigny, 1826

Foraminifera are typically defined as unicellular organisms characterized by the presence of granuloreticulopodia. Some species are naked, but most have a membranous, agglutinated, or calcareous test, which is either monothalamous (single-chambered) or polythalamous (multi-chambered). Foraminifera live in marine and brackish habitats, but some members of this phylum can be found in freshwater, where they live between submerged mosses, in sediment, and also in mosses growing on soil, trees and walls.
Non-marine foraminifera are among the least known groups of protists and only a handful of species have been described since the 19th century. These non-marine species seem to be rare, only a handful of people ever found them, despite of their relatively large size. All known freshwater and soil species are monothalamous, and therefore called monothalamids or traditionally ‘allogromids’, and now defined as foraminifera that are either naked or possess a monothalamous test. This test can be organic-walled or embedded with agglutinated particles gathered from the surrounding sediment. These three morphotypes are respectively called naked, organic-walled and agglutinated monothalamids, an artificial classification that has no phylogenetical base, because many monothalamid clades comprise both organic-walled and agglutinated species.

Lacogromia cassipara
Lacogromia cassipara, a large non-marine foraminifer.
Recent posts

Velamentofex

Velamentofex tyrolensis Family Velamentofexidae Völcker and Clauß, 2020 Diagnosis: Multinucleate organic-walled monothalamous foraminifera. Test spherical to pyriform, usually surrounded by a broad layer of mucus-like

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Claparedellus lachmannii

Claparedellus lachmannii, common shape (Riedensee) Claparedellus lachmannii  Khanipour Roshan and Clauß, 2020 Diagnosis: Multinucleate organic-walled monothalamous foraminifera. Test spherical to elongated pyriform or irregularly shaped, with a

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Claparedellus

Claparedellus lachmannii Genus Claparedellus Khanipour Roshan and Clauß, 2020 Diagnosis: Multinucleate organic-walled monothalamous foraminifera. Test spherical to elongated pyriform or irregularly shaped, with a hyaline, flexible,

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Haplomyxa spec

Fig. 1: Main cell body of specimen A, partly hidden by debris Haplomyxa sp. Three specimens were observed in a Petri dish, along with two

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Edaphoallogromiidae

Edaphoallogromia australica Family Edaphoallogromiidae Siemensma, Holzmann, Apothéloz-Perret-Gentil, Clauß, Voelcker, Bettighofer, Khanipour Roshan, Walden, Dumack and Pawlowski, 2020 Diagnosis: Multinucleate organic-walled monothalamous foraminifera with a spherical

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Lachmanni spec.

“Lachmanni spec., body length 127 µm “Lachmanni” spec. I found two cells, size about 125 µm when ovoid, with an organic-walled membranous test and a

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