Porosia
P. paracarinata SEM image. Scale bar 50 μm
Scientific classification Edit this classification
Domain: Eukaryota
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. 1 2 3 4 5 6 Bobrov, Anatoly; Kosakyan, Anush. "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. doi:10.1016/j.ympev.2022.107557. hdl:10261/281619. ISSN 1055-7903. PMID 35777650.
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