Etymology: Chu (Pinyin) meaning early and Greek, herpeton, meaing crepping animal.

Species: *tianyiensis* GAO & SHUBIN, 2003

Etymology: Tianyi, ancient country name for Ningcheng.

Referred material:

WANG, DONG, & EVANS, 2016

Locality: West Slope, Muyingzi Village, Jianping County, Liaoning Province, China.

Horizon: Jiulongshan Formation.

Biostratigraphy:

Age: Bathonian Stage, upper middle Dogger Epoch, Middle Jurassic.

Material:

IVPP V 15521: Nearly complete specimen with polydactyly. Right pes has 4 toes (metatarsals) with a reduced phalangeal formual (brachydactyly), ?2-2-2-2, left pes has a total of 8 digits, with a phalangeal forluma of 2-2-2-2-3-3-3-3

IVPP V 16107A, B: Nearly complete speicmen with polydactyly, both pes has 6 digits (left 20203030403, and right 2-2-3-3-3-?), the right manus has forud digits with an additional phalanx on the fourth digit (2-2-3-3).

IVPP V 16370A: Incomplete specimen preserving only the back half of the skeleton, with polydactyly, the left pes is normal (202030303), but the right has 6 digits (202030303030, post-axial addition).

IVPP V 16372: Incomplete specimen with the last 2 digits on the right pess (20203030303) diverge from the other four to creat a bifid pes.

IVPP V 16373A, B: Nearly complete specimen, with extra right hind limbs, the second right limb smaller than the first.

Locality: Guancaishan Ridge, Muyingzi Village, Jianping County, Liaoning Province, China.

Horizon: Jiulongshan Formation.

Biostratigraphy:

Age: Bathonian Stage, upper middle Dogger Epoch, Middle Jurassic.

Material:

IVPP V 17094A, B: Fragmentary specimen with polydactyly, the right pes has six-digits (2-2-3-3-3-2).

IVPP V 17099A, B: Nearly complete specimens with supernumerary limbs. normal front limbs with 4 digits (right 2-2-3-2, and the right with an extra phalange, 2-2-3-3), and three hind limbs.

Locality: Sishimudi, Dasuzigou Village, Jianping County, Liaoning Province, China.

Horizon: Jiulongshan Formation.

Biostratigraphy:

Age: Bathonian Stage, upper middle Dogger Epoch, Middle Jurassic.

Material:

IVPP V 15688A, B: Nearly complete specimen with normah haind limbs (pedal phalangeal formula 2-2-3-3-3), but the right manus has five digits instead of four (1+-1+-3-3-2), the left manus has four digits (?-?-3-3).

IVPP V 16369A, B: Nearly complete specimen.

IVPP V 16371A, B: Nearly complete specimen with polydactyle, right manus has five digits (2-?-?-2+-1+), both pedes have sixe digit, right is 2-2-3-3-3-3.

IVPP V 10714A, B: Nearly complete specimens, with polydactyly, each pes has six digits (left 2-2-3-3-3-3, and right 2-2-3-3-3-?).

Locality: Shuiquan, Dasuzigou Village, Jianping County, Liaoning Province, China.

Horizon: Jiulongshan Formation.

Biostratigraphy:

Age: Bathonian Stage, upper middle Dogger Epoch, Middle Jurassic.

Material:

IVPP V 16108A, B (layer 3): Nearly complete specimne with polydactyly, 5 digits on teh left manys with a phalangeal formula 2-2-3-2-?. Left hind limb slightly shorter (reduced femur), and six digits on the pes, with a phangula formula of 2-2-2-2-2-2-2, the right pes has five digits (2-2-3-2+-3).

IVPP V 16109A, B (layer 4): Nearly complete specimen with polydactyly, the right and left manus both have 5 dibits (2-2-3-2-1), the right hind limb is compressed onto the tail, and seems to have 5 digits, the left pes has six digits (2-2-3-3-3-2), the first four of these digits are separted form teh other two to produce a strongly bifid pes.

IVPP V 16368 (layer 5): Nearly complete specimen with normah haind limbs (pedal phalangeal formula 2-2-3-3-3), but the right manus has five digits instead of four (2-2-3-3-2).