Order EUGLYPHIDA Copeland 1956, emend. Cavalier-Smith 1997
Test of organic material; most taxa with secreted silica scales held together by an organic cement; tubular mitochondrial cristae.
 
 
Suborder EUGLYPHINA Kosakyan et al., 2016
 
Euglyphidae Wallich 1864, emend Lara et al., 2007
Test with thin elliptical scales; presence of specialized scales around the pseudostome with typical indentation. Euglypha.
 
 
 
Euglypha
Euglypha
 
 
 
 
 
Assulinidae Lara et al. 2007
Acrostome test composed of elliptic plates disposed in a regular, alternate pattern; test strongly compressed; no specialized type of scales around pseudostome. Assulina, Placocista, Valkanovia.
 
 
 
Assulina seminulum
Placocista spinosa
 
 
 
 
 
Trinematidae Hoogenraad & De Groot 1940, emend Adl et al. 2012

Test with bilateral symmetry; scales oval or round, sometimes of both types; specialized tooth-shaped scales around the aperture; aperture invaginated in some taxa. Corythion, Playfairina, Puytoracia, Trinema.

 
 
 
trinema
Corythion-dubium
 
 
 
 
 
Sphenoderiidae Chatelain et al, 2013

Test with self-secreted circular to elliptical silica scales of different sizes and shapes, but without indentations; pseudostome surrounded with small round or oval scales; usually its ventral side shorter. Sphenoderia and Trachelocorythion.

 
 
 
Sphenoderia
Trachelocorythion
 
 
Cyphoderiidae De Saedeleer 1934
Scales circular, oval or kidney-shaped, juxtaposed or imbricated; test aperture angled, some with collar. Campascus, Corythionella, Cyphoderia, Messemvriella, Pseudocorythion, Schaudinnula.
 
 
 
Cyphoderia
Campascus minutus
 
 

Paulinellidae De Saedeleer 1934, emend. Adl et al. 2012

Pyriform, uncompressed shape; scales, when present, long, with length perpendicular to aperture. At least one genus (Ovulinata) with totally organic test without silica scales. Ovulinata, Paulinella.

 
 
 
 
 
Paulinella
 
 
 
 
 
 
Incertae sedis
Euglyphida: Ampullataria, Deharvengia, Euglyphidion, Heteroglypha,Matsakision, Pareuglypha, Pileolus, Sphenoderia, Tracheleuglypha, Trachelocorythion.
 
 
 
Pareuglypha reticulata
Tracheleuglypha dentata