agathiceratidae, as revised, makes up the goniatitid superfamily agathiceratoidea. agathiceratidae, which lived from the upper carboniferous (pennsylvanian) to the middle permian, combine related genera with subdiscoidal to globular shells that have a small umbilicus and goniatitic sutures and are prominently longitudinally lirate. (miller "et al." 1960) the explanation for the agathiceratidae is that for the agathiceratoidea.