Leptopleuroninae
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Leptopleuroninae is an extinct subfamily of procolophonid reptiles. It is defined as all taxa closer to Leptopleuron lacertinum than to Procolophon trigoniceps. The oldest member of Leptopleuroninae is Phonodus dutoitorum from the Induan age of the Early Triassic. It is the only procolophonid group that survived into the Late Triassic.
Phylogeny
A cladogram showing relationships within Procolophonidae after Modesto et al., 2010:
Below are two cladograms that follow phylogenetic analyses by Butler et al. (2023):