Dinosaurs A to Z
Mamenchisauridae

Tongnanlong zhimingi

"Tongnan District dragon"

Generic sauropod body-plan outline
You 1.8 m (5.9 ft) tall
Tongnanlong 26 m (85 ft) long
as long as 15 people standing fingertip to fingertip
generic sauropod body plan, scaled to length — not a silhouette of Tongnanlong
Length
26 m (85 ft)
Period
Late Jurassic (163–145 Mya)
Place
China
Food
Herbivore
Clade
Mamenchisauridae
Tongnanlong reconstruction by Connor Ashbridge
Reconstruction · Connor Ashbridge (CC-BY)

Tongnanlong (meaning “Tongnan District dragon”) is a genus of mamenchisaurid dinosaur from the Late Jurassic Suining Formation of Chongqing, China. The type species is Tongnanlong zhimingi.

What we know

  • Named by Wei et al., 2025.
  • Body length estimated at about 26 m.
  • Fossils found in China.

What we guess

The reconstruction notes for Tongnanlong — soft tissue, color, behavior — haven't been written up yet. Only the recorded basics above are filled in so far.