[2] It is defined as all taxa closer to Leptopleuron lacertinum than to Procolophon trigoniceps.

[2] The oldest member of Leptopleuroninae is Phonodus dutoitorum from the Induan age of the Early Triassic.

[4] A cladogram showing relationships within Procolophonidae after Modesto et al., 2010:[3] Coletta seca Pintosaurus magnidentis Sauropareion anoplus Kitchingnathus untabeni Phaanthosaurus sp.

Theledectinae Tichvinskia vjatkensis Procolophoninae Pentaedrusaurus ordosianus Neoprocolophon asiaticus Phonodus dutoitorum Sclerosaurus armatus Scoloparia glyphanodon Leptopleuron lacertinum Soturnia caliodon Hypsognathus fenneri Below are two cladograms that follow phylogenetic analyses by Butler et al. (2023):[4] Neoprocolophon Pentaedrusaurus Mandaphon Scoloparia Sclerosaurus Hwiccewyrm Hypsognathus Soturnia Leptopleuron

Kapes bentoni Thelephon Kapes majmesculae Pentaedrusaurus Anomoiodon Theledectes Procolina Phonodus Mandaphon Neoprocolophon Scoloparia Sclerosaurus Hwiccewyrm Leptopleuron Hypsognathus Soturnia