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
Placocysta

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
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, Trachelocorythion.
Trachelcorythion
Sphenoderia
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