Porosia

Porosia
P. paracarinata SEM image. Scale bar 50 μm
Scientific classification
Domain:	Eukaryota
Clade:	Amorphea
Phylum:	Amoebozoa
Class:	Tubulinea
Order:	Arcellinida
Family:	Hyalospheniidae
Genus:	Porosia Jung 1942 sensu Bobrov & Kosakyan [1]
Type species
Porosia bigibbosa (Penard 1890) Jung 1942
Species
P. bigibbosa P. paracarinata

Porosia is a genus of arcellinid testate amoebae belonging to the family Hyalospheniidae. ^[2] Described in 1942, it used to be a monotypic genus with the sole species P. bigibbosa . However a second species, P. paracarinata , was discovered in 2015. ^[1]

Morphology

The original 1942 description of Porosia corresponds to the type species P. bigibbosa . The description was expanded in 2015 to fit both species. ^[1]

The organism consists of a pyriform, laterally compressed test with a rounded posterior end, two large invaginated pores situated on each lateral compression, both of which connected by internal tubes in Certesella . Small lateral pores are seen anterior to the large ones. Lateral keels, present in P. paracarinata but absent in P. bigibbosa , surround a third of the posterior lateral margins. The test itself is composed of euglyphid shell plates embedded in a disorganized cement. The test's aperture or "pseudostome" is surrounded with a lip made of organic compounds. ^[1]

It is closely related to Certesella , but lacks a punctuated neck. ^[1]

Ecology

Porosia species are rare and have been seen inhabiting Sphagnum mosses, forest litter and soil. ^[1]

References

1. Bobrov, Anatoly; Kosakyan, Anush (22 October 2015). "A New Species from Mountain Forest Soils in Japan: Porosia paracarinata sp. nov., and Taxonomic Concept of the Genus Porosia Jung, 1942". Acta Protozoologica. 54 (4): 289–294. doi: 10.4467/16890027AP.15.024.3538 .
2. González-Miguéns, Rubén; Todorov, Milcho; Blandenier, Quentin; Duckert, Clément; Porfirio-Sousa, Alfredo L.; Ribeiro, Giulia M.; Ramos, Diana; Lahr, Daniel J.G.; Buckley, David; Lara, Enrique (2022). "Deconstructing Difflugia: The tangled evolution of lobose testate amoebae shells (Amoebozoa: Arcellinida) illustrates the importance of convergent evolution in protist phylogeny". Molecular Phylogenetics and Evolution. 175 (107557): 107557. Bibcode:2022MolPE.17507557G. doi: 10.1016/j.ympev.2022.107557 . hdl: 10261/281619 . ISSN   1055-7903. PMID   35777650.