Aorun zhaoi (Choiniere et al. 2013; IVPP V15709, Late Jurassic 161mya) was originally considered the oldest known coelurosaurian theropod and a juvenile. Here it nests between Sinocalliopteryxand Compsognathus. It was considered a juvenile and found in the same formation as Guanlong, Haplocheirus, Limusaurus, Monolophosaurus, Sinraptor and Zuolong.

GMV 2124 (undescribed, scale bars?) has a short metatarsal 3 and nests with Aorun at the base of the Compsognathidae + Ornitholestidae in the LRT.

Compsognathus longipes (Wagner 1859, Ostrom 1978, Late Jurassic, quarry unknown, 150 mya, 3 ft (89 cm) long, BSP AS I 563 ) was long considered the smallest dinosaur known, other than its contemporary, Archaeopteryx. This small biped nests withStruthiomimus in the large reptile tree. Premaxillary teeth were unserrated. Posterior teeth were serrated, flattened and recurved. Rather than two or three fingers, there were three robust fingers and a fourth vestige.

Ubirajara jubatus (Smyth et al. 2020; Early Cretaceous) was a small compsognathid theropod lacking a skull, tail and pelvis. It was originally reconstructed with unique decorative rods emanatng from the shoulders. Here those are identified as the missing legs.

Bidar AL, Demay L and Thomel G 1972b. Compsognathus corallestris,
une nouvelle espèce de dinosaurien théropode du Portlandien de Canjuers (Sud-Est de la France). Annales du Muséum d’Histoire Naturelle de Nice 1:9-40.

Choiniere JN, Clark JM, Forster CM, Norella MA, Eberth DA, Erickson GM, Chu H and Xu X 2013. A juvenile specimen of a new coelurosaur (Dinosauria: Theropoda) from the Middle–Late Jurassic Shishugou Formation of Xinjiang, People's Republic of China. Journal of Systematic Palaeontology. online. doi:10.1080/14772019.2013.781067

Ostrom JH 1978. The osteology of Compsognathus longipes. Zitteliana 4: 73–118.

Smyth RSH, Martill DM, Frey E Rivera-Silva HE and Lenz N 2020. A maned theropod dinosaur from Brazil with elaborate integumentary structures. Cretaceous Research. doi:10.1016/j.cretres.2020.104686

Wagner JA 1859. Über einige im lithographischen Schiefer neu aufgefundene Schildkröten und Saurier. Gelehrte Anzeigen der Bayerischen Akademie der Wissenschaften 49: 553.

wiki/Compsognathus
wiki/Aorun
wiki/Ubirajara_jubatus