Skip to main content Skip to main navigation menu Skip to site footer
Type: Article
Published: 2020-11-26
Page range: 384–394
Abstract views: 127
PDF downloaded: 3

Frenopyxis stierlitzi gen. nov., sp. nov.—new testate amoeba (Amoebozoa: Arcellinida) from the urban parks with notes on the systematics of the family Centropyxidae Jung, 1942

Lomonosov Moscow State University, Leninskiye gory 1, Moscow, Russia, 119991
Lomonosov Moscow State University, Leninskiye gory 1, Moscow, Russia, 119991 Severtsov Institute of Ecology and Evolution, Leninskiy ave. 33, Moscow, Russia, 117071
Protist Testate amoebae Centropyxidae Frenopyxis Frenopyxis stierlitzi tree hollows urban parks Potsdam Moscow


New species, Frenopyxis stierlitzi, is described from tree hollows in the urban parks in Moscow (Russia) and Potsdam (Germany). The species belongs to the new genus of the family Centropyxidae and characterized by unique character, i.e. an internal thick organic lip surrounding an aperture and continuing in a bridle, which connects an aperture with the internal side of a shell wall and broaden in the place of connection of a bridle and a shell wall. The systematics of the family Centropyxidae is discussed and the importance of the structures, which divide inner shell volume into compartments, is underlined.



  1. Bartoš, E. (1954) Koreňonožce radu Testacea. Vydatelstvo slovenskoj Academie vied, Bratislava, 191 pp.

    Bobrov, A. & Mazei, Yu. (2004) Morphological variability of testate amoebae (Rhizopoda: Testacealobosea: Testaceafilosea) in natural populations. Acta Protozoologica, 43, 133–146.

    Bobrov, A. & Mazei, Yu. (2020) Meisterfeldia bitsevi—new testate amoeba of the family Cryptodifflugiidae Jung, 1942 (Amoebozoa: Arcellinida) from the tree hollow in the urban park (Moscow, Russia) with a key to species of the genus Meisterfeldia. Zootaxa. [in press]

    Bonnet, L. (1959) Dékystement, phase trophique et enkystement chez Plagiopyxis minuta Bonnet (Thécamoebiens). Incidences systématiques. Comptes rendus hebdomadaires des séances de l’Académie des sciences, Paris, 249, 2617–2619.

    Chardez, D. & Beyens, L. (1988) Centropyxis gasparella sp. nov. and Parmulina louisi sp. nov., new testate amoebae from Canadian Hight Arctic (Devon Island, NWT). Archiv für Protistenkunde, 136, 337–344.

    Decloitre, L. (1978) Le genre Centropyxis I. Complements а jour au 31 decembre 1974 de la Monographie du genre parue en 1929. Archiv für Protistenkunde, 120, 63–85.

    Decloitre, L. (1979) Le genre Centropyxis II. Complements а jour au 31 decembre 1974 de la Monographie du genre parue en 1929. Archiv für Protistenkunde, 121, 162–192.

    Deflandre, G. (1929) Le Genre Centropyxis Stein. Archiv für Protistenkunde, 67, 322–375.

    Dekhtjar, M.N. (2009) The peculiarities of shell morphology and taxonomic composition of the family Centropyxidae (Testacealobosia, Rhizopoda). Vestnik zoologii, 43, 297–303. [in Russian with English summary]

    Filimonova, T.A., Mazei Yu.A. & Tsyganov, A.N. (2005) Morphology and ecology of testate amoeba Centropyxis ecornis (Ehrenberg, 1838) Leidy, 1879. Izvestiya Penzenskogo gosudarstvennogo pedagogicheskogo universiteta im.i V.G. Belinskogo, 1, 40–43. [in Russian]

    Godeanu, S. (1972) Especes nouvelles de thécamoebiens (Protozoa, Rhizopoda, Arcellinida). Revue Roumaine de Biologie, Série de zoologie, 17, 227–236.

    Golemansky, V. (1971) Taxonomische und zoogeographische Notizen über die thekamöbe Fauna (Rhizopoda, Testacea) der Kustengrundgewasser der sowjetischen Fernostkuste (Japanisches Meer) und der Westkuste Kanadas (Stiller Ozean). Archiv für Protistenkunde, 113, 235–249.

    Kosakyan, A., Lahr, D.J.G., Mulot, M., Meisterfeld, R., Mitchell, E.A.D. & Lara, E. (2016) Phylogenetic reconstruction based on COI reshuffles the taxonomy of hyalosphenid shelled (testate) amoebae and reveals the convoluted evolution of shell plate shapes. Cladistics, 32, 581–699.

    Leidy, J. (1879) Fresh-water Rhizopods of North America. Report of the United States Geological Survey of the Territories, 12, 1–324.

    Loeblich, A.R. Jr. & Tappan, H. (1964) Sarcodina, chiefly “Thecamoebians” and Foraminiferida. In: Moore, R.C. (Ed.), Treatise on Invertebrate Paleontology: Part C, Protista. Geological Society of America and University of Kansas Press, Lawrence, Kansas, pp. 16–54.

    Mazei, Yu., Chernyshov, V., Tsyganov, A. & Payne, R. (2015) Testing the effect of refrigerated storage on testate amoeba samples. Microbial Ecology, 70, 861–864.

    Mazei, Yu., Blinokhvatova, Yu. & Embulaeva, E. (2011) Specific features of the microspatial distribution of soil testate amoebae in the forests of the Middle Volga Region. Arid Ecosystems, 1, 46–52.

    Mazei, Yu. & Tsyganov, A. (2006) Freshwater testate amoebae. KMK Scientific Press, Moscow, 300 pp. [in Russian]

    Meisterfeld, R. (2000) Order Arcellinida Kent, 1880. In: Lee, J.J., Leedale, G.F. & Bradbury, P. (Eds.), An illustrated Guide to the Protozoa. Vol. 2. 2nd Edition., Allen Press., Lawrence, Kansas, pp. 827–860.

    Nasser, N.A. & Patterson, R.T. (2015) Conicocassis, a new genus of Arcellinina (testate lobose amoebae). Palaeontologia Electronica, 18 (3.46A), 1–11.

    Netzel, H. (1975) Morphologie und Ultrastruktur von Centropyxis discoides (Rhizopoda, Testacea). Archiv für Protistenkunde, 117, 369–392.

    Penard, E. (1890) Études sur les Rhizopodes d’eau douce. Mémoires de la Société de physique et d’histoire naturelle de Genève, 31, 1–230.

    Schönborn, W. (1964) Bodenbewohnende Testaceen aus Deutschland. II. Untersuchungen in der Umgebung des Grossen Stechlinsees (Brandenburg). Limnologica, 2, 491–499.

    Tsyganov, A.N., Babeshko, K.V. & Mazei, Yu. A. (2016) A guide to testate amoebae with the keys to genera. Penza State University Press, Penza, 132 pp.

    Tsyganov, A.N. & Mazei, Yu.A. (2006) Morphology, biometry and ecology of Arcella gibbosa Penard, 1890 (Rhizopoda, Testacealobosea). Protistology, 4, 279–294.

    Živković, A. (1975) Nouvelles et rares espéces de Testacea (Rhizopoda) dans la fauna de Danube. Bulletin du Muséum d’histoire naturelle de Belgrade, Série B, Sciences biologiques, 30, 119–123.