Note: Huene, 1927a named Cetiosauriscus leedsi for Ceitosaurus leedsi, but not the type of C. leedsi, but for the referred specimen published by WOODWARD, 1905. His 1927a paper was confusing, but his 1927b paper explained it better. Charig, 1980 followed his first paper and renamed the species to stewarti. This is unwarranted because genera can have the same species name and is here emended back to Huene’s original description. The ICZN ruled in favor of CHARIG in 1995 therefore the correct species is stewarti and not leedsi.

Species: ? longus (OWEN, 1842) McINTOSH, 1990 (nomen dubium)
Etymology: Latin, longus, "long."
= Cetiosaurus longus OWEN, 1842 (nomen dubium)

Holotype: OUM J.13647

Locality: Enslow, Oxfordshire County, England, Southern United Kingdom.

Horizon: Great Oolite.

Biostratigraphy:

Age: Bajocian Stage, Middle Dogger Epoch, Middle Jurassic.

Material: Vertebrae.

Referred material:

DELAIR & WIMBLEDON, 1993

Locality: Brill or Hartwell, Buckinghamshire County, England, Southern United Kingdom.

Horizon: ‘Rubble’ bed, Portland Stone.

Biostratigraphy:

Age: Tithonian Stage, Upper Malm Epoch, Late Jurassic.

Material:

Number: Not given: Centra.

Locality: Stone-pit at Garsington, Oxfordshire County, England, Southern United Kingdom.

Horizon: ‘rubble’ bed, Portland Stone.

Biostratigraphy:

Age: Tithonian Stage, Upper Malm Epoch, Late Jurassic.

Material:

OUM: Centrum.

 

Locality: Thame, Oxfordshire County, England, Southern United Kingdom.

Horizon: ‘Rubble’ bed, Portland Stone.

Biostratigraphy:

Age: Tithonian Stage, Upper Malm Epoch, Late Jurassic.

Material:

OUM: Centra and a ‘blade’bone.

 

Locality: Unprovenanced, Oxfordshire County, England, Southern United Kingdom.

Horizon: ‘stone’, Portland Stone.

Biostratigraphy:

Age: Tithonian Stage, Upper Malm Epoch, Late Jurassic.

Material:

Number: Not given:

 

Locality: Cuddesdon, Oxfordshire County, England, Southern United Kingdom.

Horizon: Portland Rock, Portland Stone.

Biostratigraphy:

Age: Tithonian Stage, Upper Malm Epoch, Late Jurassic.

Material:

Number: Not given:Centrum.

Note: ?longus.

HOLLAND, 1910

Locality: County, Southern United Kingdom.

Horizon:

Biostratigraphy:

Age: Late Jurassic.

Material:

Gallery of Paleontology at South Kensington: Caudal vertebrae 47-56.

OWEN, 1875

Locality: Blechingdon, Oxfordshire County, England, Southern United Kingdom.

Horizon:

Biostratigraphy:

Age: Early Jurassic.

Material:

Number: Not given: Femur.

 

Locality: Blisworth, Northamptonshire County, England, Southern United Kingdom.

Horizon: Great Oolite.

Biostratigraphy:

Age: Early Jurassic.

Material:

Number: Not given: Some fragmentary long bones.

 

Locality: Enslow Rocks, at Kirtlington Station, 8 miles north of Oxford, Oxfordshire County, England, Southern United Kingdom.

Horizon: Great Oolite.

Biostratigraphy:

Age: Early Jurassic.

Material:

Number: Not given: Fragmentary skeleton.

 

Locality: Near Enslow Bridge, north of Oxford, Oxfordshire County, England, Southern United Kingdom.

Horizon: Underlying the Cornbrush, Great Oolite.

Biostratigraphy:

Age: Early Jurassic.

Material:

Number: Not given: Femur.

_____________________________________________________________________________________

Species: stewarti CHARIG, 1980
Etymology: In honor to Sir Ronald Steward, Bt., the retired chairman of the London Brick Company Limited, in grateful recognition of the generous cooperation which his Company has long afforded the British Museum [Natural History].
= Cetiosaurus leedsi HUENE, 1927 non HULKE, 1887

Holotype: BMNH R3078

Locality: Discovered in the 1898 at the New Peterborough Brick Company, No. 1 yard (LEEDS 1956), near Peterborough, Cambridgeshire County, England, Southern United Kingdom.

Horizon: Lower Oxford Clay.

Biostratigraphy: Jason or Coronatum zone.

Age: Middle Callovian Stage, Upper Dogger Epoch, Late Middle Jurassic.

Material: Fragmentary skeleton.

Humerus showing cartilage cap.

Referred material:

BMNH R1967: proximal caudal vertebrae.