Genus: Sphenospondylus LYDEKKER, 1888 (nomen dubium)
Etymology: Greek, sphenos, “wedge” and Greek, spondylus, “vertebra”: “Wedge vertebra”.

Species: gracilis LYDEKER, 1888 (nomen dubium)
Etymology: Latin, gracilis, "slender."

Holotype: BMNH R 142

Locality: Brook, Isle of Wight County, England, Southern United Kingdom.

Horizon: Wessex Formation, Wealden Group.

Biostratigraphy:

Age: Valanginian-Hauterivian Stage, Neocomian Subepoch- Barremian Stage, Lower Gallic Subepoch, Early Cretaceous Epoch, Early Cretaceous.

Material: 6 dorsal vertebrae, missing tip of neural spine.

Broken down as follows.

BMNH R142: A slightly imperfect anterior or middle dorsal vertebra.

BMNH R142a: An imperfect anterior dorsal vertebra.

BMNH R142b: An imperfect dorsal vertebra.

BMNH R142c: A slightly imperfect interior or middle dorsal vertebra.

BMNH R142d: A slightly imperfect anterior dorsal vertebra.

BMNH R142e: A more imperfect anterior or middle dorsal vertebra.

Referred material:

LYDEKKER, 1888

BMNH R135a: An imperfect anterior or middle dorsal vertebra.

BMNH R143: An imperfect near the anterior dorsal series.

BMNH R143b: An imperfect anterior or middle dorsal vertebra.

BMNH R166: The centrum of a small dorsal vertebra.

BMNH R165: A posterior dorsal vertebra, with the arch imperfect.

BMNH 28935: A series of 4 united posterior dorsal or lumbar vertebrae.

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