Ornithosuchids are often just a footnote.
Only three taxa are known, Ornithosuchus, Venaticosuchus and Riojasuchus (Fig. 1). And nobody pays much attention to them because they’re, frankly, off the beaten track.
thanks to phylogenetic analysis (and the large reptile tree) we can add one more, the much smaller basal form, Osmolskina. Sure it doesn’t have all the traits of the classic ornithosuchids, but among the 378 taxa now included, no others come closer.
Borsuk-Bialynicka M and Evans SE 2009. Cranial and mandibular osteology of the Early Triassic archosauriform Osmolskina czatkowicensis from Poland. Palaeontologia Polonica 65, 235–281.