Huinculsaurus

Huinculsaurus (meaning "Huincul Formation lizard") is a genus of elaphrosaurine noasaurid dinosaur from the Huincul Formation in Neuquén Province, Argentina. The type and only species is Huinculsaurus montesi. It was probably around when fully grown, although this is only speculation since no fully mature specimens are currently known.
Discovery and naming.
"Huinculsaurus" is only known from three thoracic and two sacral vertebrae from an immature individual, discovered around 1991. It was discovered ten meters away from where the original "Ilokelesia" specimen was discovered and the vertebrae were mechanically separated during preparation. The genus was eventually named in 2020.
Classification.
"Huinculsaurus" was placed in the Elaphrosaurinae subfamily of Noasauridae in 2020. It was most closely related to "Elaphrosaurus" and "Limusaurus", both from the Late Jurassic. This would make "Huinculsaurus" the youngest known elaphrosaurine.