Genus: Diandongosaurus SHANG, WU & LI, 2010
Etymology: The generic name is derived from "Diandong", meaning the eastern Yunnan Province, China, where the fossil site is located, and Greek, sauros,"lizard."

Species: acutidentatus SHANG, WU & LI, 2010
Etymology: Latin, acutidens, "teeth"; in reference to sharp teeth.

Holotype: IVPP V 17761

Locality: Da'aozi Village, Luoping County, Yunnan Province, China.

Horizon: Upper Member, Guanling Formation.

Biostratigraphy: Nicoraella kockeli conodon zone.

Age: Middle Anisian Stage, Lower Mid Triassic, Lower Middle Triassic.

Material: Skull and skeleton.

Referred material:

LIU, LIN, RIEPPEL, SUN, LI, LU, & JIANG, 2015

BGPDB-ROOO1, NMNS-000933-F03498: Nearly complete specimens.

LIU, YANG, CHENG, BENTON, MOON, YAN, AN & TAIN, 2021, 2023

WIGM SPC V 1105: A nearly complete skull and skeleton.

Note: It has an amputated hind ime on the right side.