CALVINIA DISTRICT

FARM UITKYK

WHITEHILL FORMATION

ECCA GROUP

UPPER DWYKA SHALES

KUNGURIAN STATE

UPPERMOST ROTILEGENDES EPOCH

MIDDLE PERMIAN

STEM: TETRAPODA GOODRICH, 1930

SUPERCLASS: AMNIOTA HAECKEL, 1866

CLASS: REPTILIA LAURENTI, 1768

SUBCLASS: PARAREPTILIA OLSON 1947

INFRACLASS: INCERTAE SEDIS

ORDER: PROGANOSAURIA BAUR, 1887

Family: MESOSAURIDAE Baur, 1889

Mesosaurus tenuidens
= Mesosaurus brasiliensis

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