Genus: Thecospondylus SEELEY, 1882 (nomen dubium)
Etymology: Greek, theke, “sheath, socket”, and Greek, spondylus, “vertebrae”: “Sheath vertebrae”.

Species: horneri SEELEY, 1882 (nomen dubium)
Etymology: In honor of Dr. A. C. Horner of Tombridge, England.

Holotype: BMNH R291

Locality: Quarry at Southborough, Kent County, England, Southern United Kingdom.

Horizon: Hasting Sands, Lower Wealden.

Biostratigraphy:

Age: Early Cretaceous.

Material: Neural cast of a sacrum.