Leptopleuroninae is an extinct

subfamily In biological classification, a subfamily (Latin: ', plural ') is an auxiliary (intermediate) taxonomic rank, next below family but more inclusive than genus. Standard nomenclature rules end botanical subfamily names with "-oideae", and zo ...

of procolophonid reptiles. It is defined as all taxa closer to '' Leptopleuron lacertinum'' than to ''

Procolophon trigoniceps ''Procolophon'' (from , 'before' and , 'summit') is a genus of lizard-like procolophonidae, procolophonid Parareptilia, parareptiles that first appeared in the Early Triassic (Induan) of South Africa, Brazil, and Antarctica. It persisted throu ...

''. The oldest member of Leptopleuroninae is '' Phonodus dutoitorum'' from the

Induan The Induan is the first age of the Early Triassic epoch in the geologic timescale, or the lowest stage of the Lower Triassic series in chronostratigraphy. It spans the time between 251.9 Ma and 249.9 Ma (million years ago). The Induan is so ...

age of the Early

Triassic The Triassic ( ; sometimes symbolized 🝈) is a geologic period and system which spans 50.5 million years from the end of the Permian Period 251.902 million years ago ( Mya), to the beginning of the Jurassic Period 201.4 Mya. The Triassic is t ...

. It is the only procolophonid group that survived into the Late Triassic.

Phylogeny

cladogram A cladogram (from Greek language, Greek ''clados'' "branch" and ''gramma'' "character") is a diagram used in cladistics to show relations among organisms. A cladogram is not, however, an Phylogenetic tree, evolutionary tree because it does not s ...

showing relationships within Procolophonidae after Modesto ''et al''., 2010: Below are two cladograms that follow

phylogenetic analyses In biology, phylogenetics () is the study of the evolutionary history of life using observable characteristics of organisms (or genes), which is known as Computational phylogenetics, phylogenetic inference. It infers the relationship among organ ...

by Butler ''et al''. (2023): Analyses 1 and 3: Strict consensus of 760 and 18 most parsimonious trees (MPTs). Analysis 2: Single MPT.

References

Leptopleuroninae Triassic parareptiles Early Triassic first appearances Late Triassic extinctions {{paleo-reptile-stub