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Plagiopyxis labiata
Plagiopyxis labiata
Plagiopyxis labiata

Family Plagiopyxidae Bonnet et Thomas, 1960

Diagnosis: Lobose testate amoebae with bilaterally symmetrical organic test covered with fragments of mineral grains, diatoms and organic debris; aperture a more or less invaginated slit on the ventral side, eccentric, overhung by an anterior lip, in ventral view often difficult to observe (cryptostome).

1 Anterior lip of pseudostome a distinct, overhanging hood 6
Aperture more or less slit-like, no overhanging hood 2
2 Anterior lip of pseudostome with pores Bullinularia
No such pores 3
3 Anterior (dorsal) lip curves below convex ventral face Geoplagiopyxis
Posterior (ventral) lip curves below anterior lip, or pseudostome is an open slit 4
4 Aperture covered by the anterior lip 5
Aperture is an open slit Protoplagiopyxis
5 Posterior (ventral) lip with extension towards anterior lip and connected to the dorsal side of the test from inside Paracentropyxis
No extension of the posterior lip Plagiopyxis
6 Ventral area (sole) rounded Hoogenraadia
Ventral area (sole) flattened Planhoogenraadia

after Meisterfeld, 2002

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