Liaoningotitan
# Liaoningotitan

Liaoningotitan (meaning "Liaoning giant") is a genus of titanosauriform sauropod from the Early Cretaceous (Barremian) Yixian Formation in Liaoning, China.

## Description

Distinguishing features of Liaoningotitan include a ventral margin of the maxilla that is convex, an upper tooth row that is short and anteriorly positioned; an anterior extension of the jugal that nearly reaches the level of the anterior margin of the antorbital fenestra; a basally constricted quadrate wing of the pterygoid; imbricated upper teeth, with narrow spatulate crowns that are D-shaped in cross section, and no labial grooves or denticles; nine reduced and un-imbricated lower teeth; asymmetric lower tooth crowns which are elliptical-like in cross section, with lingual grooves and ridges and a lingually bulbous basal crown; a proximal expansion of the humerus that is about 54.9% the length of the humerus; and an ilium with a pointed preacetabular process.

## Classification

Zhou et al. (2018) recover Liaoningotitan as a somphospondylan titanosauriform more derived than Euhelopus. In 2022, Mo et al. found Liaoningotitan to be an unstable taxon that may be closely related to Diamantinasaurus and Baotianmansaurus.

## Paleoecology

Liaoningotitan is one of three titanosauriforms from the Yixian Formation of Liaoning, the others being Dongbeititan and Ruixinia. These forms co-existed with feathered dinosaurs in the Early Cretaceous lacustrine environment of present-day Liaoning.

