Porosia bigibbosa
Porosia bigibbosa
P. bigibbosa with arrowed pores

Genus Porosia (Jung, 1942) emend. Bobrov et Kosakyan, 2015

Diagnosis: Test pyriform, with a rounded posterior end, laterally compressed. In front view two distinct lateral depressions with two large invaginated pores are situated on each side, which are connected by internal tubes as in the genus Certesella. In profile, small lateral pores can be observed, just anterior to the large pores. The lateral keel can (or can not) be present surrounding 1/3 of the posterior lateral margin. Test composed of euglyphid shell plates embedded in unstructured cement. Aperture curved, surrounded by an organic lip.

Type species: Porosia bigibbosa (Penard) Jung, 1942.

Ecology: herbivorous and carnivorous? Habitat: sphagnum mosses, litter, soil, rare genus. Rare.

Remarks: The keel is an important distinctive character between Porosia species:
Porosia bigibbosa – lacking of a lateral keel,
Porosia paracarinata – presence of a lateral keel.
This genus is closely related to Certesella but lacks the punctuated neck.

References: Bobrov, A. and Kosakyan, A., 2015. A New Species from Mountain Forest Soils in Japan: Porosia paracarinata sp. nov., and Taxonomic Concept of the Genus Porosia Jung, 1942. Acta Protozool. 54: 289–294.

Recent posts

Ditrema spec.

Ditrema spec. Ditrema spec. Diagnosis: Shell as with D. longicollis, but much smaller, surrounded by V-shaped structures that gave it the impression of a star.

Read More »

Rotosphaerida

Pompholyxophrys Pompholyxophrys Pompholyxophrys Rabdiophrys Rotosphaerida Rainer, 1968 Diagnosis: Aciliate predominantly spherical or flattened amoebae from which elongated actin-based filopodia extend; with flat discoid mitochondrial cristae;

Read More »

Centropyxis tabel

Key to Centropyxis species 1 Test in dorsal view circular or almost circular 2 – Test in dorsal view irregular due to various outgrows and

Read More »