Trematosauridae
They first appeared during the Induan age of the Early Triassic , and existed until around the Carnian stage of the Late Triassic , although by then they were very rare . 
<triplet> Induan <subj> age <obj> instance of <subj> Early Triassic <obj> part of <triplet> Early Triassic <subj> Induan <obj> has part <triplet> Carnian stage <subj> age <obj> instance of <subj> Late Triassic <obj> part of <triplet> Late Triassic <subj> Carnian stage <obj> has part