Martínez, R.N.; Simões, T.R.; Sobral, G.; Apesteguía, S.
morphology · topology · range · biogeography · methods
Holotype PVSJ 698 is a three-dimensionally preserved skull from the Ischigualasto Formation; CT anatomy is direct evidence and stem-lepidosauromorph placement is a multi-analysis result.
Three-dimensional holotype PVSJ 698 supplies CT-resolved cranial characters recovered as an early-diverging stem lepidosauromorph across the cited analyses; that placement does not make the individual a direct ancestor or establish whole-body anatomy.
claim:event:taytalura-stem-lepidosaur-skullThe cited analyses place Megachirella on the squamate stem, Taytalura as an early-diverging stem lepidosauromorph, and Bellairsia on the squamate stem; these placements are sampled analytical results and do not resolve every lepidosaur relationship.
claim:taxon:lepidosauria:taxonomyThe profile's named lepidosaur samples come from the Middle Triassic Italian Alps (Megachirella), Late Triassic Ischigualasto Formation of Argentina (Taytalura), and the Middle Jurassic Kilmaluag Formation of Skye, Scotland (Bellairsia specimen NMS G.2022.1.1); these occurrences do not establish a global lepidosaur distribution.
claim:taxon:lepidosauria:biogeographyHigh-resolution imaging exposes complementary early lepidosaur anatomy: Megachirella contributes cranial, wrist and shoulder characters, Taytalura preserves a three-dimensionally exposed CT-resolved skull, and Bellairsia provides synchrotron-resolved stem-lizard anatomy.
claim:taxon:lepidosauria:morphologyThe cited Megachirella, Taytalura and Bellairsia studies provide locality, anatomy and phylogenetic analyses but do not establish a single Lepidosauria diet, habitat, locomotor mode, body-size distribution or ecological guild; those fields remain explicitly unassigned here.
claim:taxon:lepidosauria:ecology