Open main menu

The euglyphids are a prominent group of filose amoebae that produce shells or tests from siliceous scales, plates, and sometimes spines. These elements are created within the cell and then assembled on its surface in a more or less regular arrangement, giving the test a textured appearance. There is a single opening for the long slender pseudopods, which capture food and pull the cell across the substrate.

"Euglypha" sp.
Euglypha sp.
Scientific classification e
(unranked): SAR
Phylum: Cercozoa
Class: Imbricatea
Order: Euglyphida
Copeland, 1956

Euglyphids are common in soils, marshes, and other organic-rich environments, feeding on tiny organisms such as bacteria. The test is generally 30-100 μm in length, although the cell only occupies part of this space. During reproduction a second shell is formed opposite the opening, so both daughter cells remain protected. Different genera and species are distinguished primarily by the form of the test. Euglypha and Trinema are the most common.

The euglyphids are traditionally grouped with other amoebae. However, genetic studies instead place them with various amoeboid and flagellate groups, forming an assemblage called the Cercozoa. Their closest relatives are the thaumatomonads, flagellates that form similar siliceous tests.


Phylogeny based on Chatelain et al. 2013[2]


Paulinellidae de Saedeleer 1934 emend. Adl et al. 2012

Cyphoderiidae de Saedeleer 1934

Tracheleuglypha Deflandre 1928


Assulinidae Lara et al. 2007

Euglyphidae Wallich 1864 emend Lara et al. 2007

Sphenoderiidae Chatelain et al. 2013

Trinematidae Hoogenraad & De Groot 1940 emend Adl et al. 2012


Order Euglyphida Copeland 1956 emend. Cavalier-Smith 1997[3]


  1. ^ "Euglyphida". WoRMS - World Register of Marine Species. Retrieved 7 September 2018.
  2. ^ Chatelain, Auriel P.; Meisterfeld, Ralf; Roussel-Delif, Ludovic; Lara, Enrique (2013), "Sphenoderiidae (fam. nov.), a New Clade of Euglyphid Testate Amoebae Characterized by Small, Round Scales Surrounding the Aperture", Protist, 164 (6): 782–792, doi:10.1016/j.protis.2013.08.001, PMID 24152919
  3. ^ Kosakyan, Anush; Gomaa, Fatma; Lara, Enrique; Lahr, Daniel J.G. (2016), "Current and future perspectives on the systematics, taxonomy and nomenclature of testate amoebae", European Journal Protistology, 164 (6): 782–792, doi:10.1016/j.ejop.2016.02.001, PMID 27004416