 However, this may also be the result of convergent evolution.Other studies question the reliability of the characters allying Diadectomorpha with Synapsida, instead agreeing with Heaton's original placement of the Diadectomorpha outside of Amniota, with the two clades remaining sister taxa.Some also argue that Amniota should be defined by the use of the amniotic egg, and that there is little evidence regarding the potential use of this reproductive strategy by "Limnoscelis," making it difficult to determine its placement relative to amniotes.