Species: trigonus (OWEN, 1840) HUENE, 1922
Etymology:
= Ichthyosaurus trigonus OWEN, 1840

Holotype: Benett collection at the Academy of Natural Sciences of Philadelphia, ANSP 10124.

Locality: Westbrook, in Bromham, Wiltshire County, England, Southern United Kingdom.

Horizon: Kimmeridge Clay.

Biostratigraphy:

Age: Kimmeridgian Stage, Middle Malm Epoch, Late Jurassic.

Material: Vertebral centrum.

Referred material:

MOON & KIRTON, 2018

OUMNH J12-64, J12483, J.12491: Dorsal vertebra, ankyloses atlas-axis complex and caudal vertebra respectively.

Neotype: Now lost

Locality:? Swindon, Wiltshire and Shotover, Oxford, Respectively, England, Southern United Kingdom.

Horizon: Kimmeridge Clay.

Biostratigraphy:

Age: Kimmeridgian Stage, Middle Malm Epoch, Late Jurassic.

Material: Cervical, dorsal and caudal vertebrae.

Referred material:

BENTON & SPENCER, 1995

Locality: Roswell Pits, Ely, (TL 555808, TL 552807), Cambridgeshire County, England, Southern United Kingdom.

Horizon: Lower Kimmeridge Clay.

Biostratigraphy:

Age: Kimmeridgian Stage, Middle Malm Epoch, Late Jurassic.

Material:

Number: Not given:

 

Locality: Kimmeridge Bay, Gaulter Gap-Broad Bench, Dorset County, England, Southern United Kingdom.

Horizon: Kimmeridge Clay.

Biostratigraphy:

Age: Kimmeridgian Stage, Middle Malm Epoch, Late Jurassic.

Material:

Number: Not given:

 

Locality: Chawley Brick Pit, Hurst Hill, Cumnor, National Grid reference SP 475 043, 2. 5 miles WSW of the centre of Oxfordshire County, England, Southern United Kingdom.

Horizon: Upper Lower Kimmeridge.

Biostratigraphy: Aulacostrephanus pseudomutablilis zone.

Age: Lower Kimmeridgian Stage, Middle Malm Epoch, Late Jurassic.

Material:

Number: Not given:

 

DELAIR, 1960

Locality: Weymouth and Kimmeridge Bay, Dorset County, England, Southern United Kingdom.

Horizon: Kimmeridge Clay.

Biostratigraphy:

Age: Kimmeridgian Stage, Middle Malm Epoch, Late Jurassic.

Material:

NHMUK PF (old BMNH) 417756, 41776d, 47506: Middle and late dorsal vertebrae.

 

Locality: Weymouth, Dorset County, England, Southern United Kingdom.

Horizon: Kimmeridge Clay.

Biostratigraphy:

Age: Kimmeridgian Stage, Middle Malm Epoch, Late Jurassic.

Material:

NHMUK PF (old BMNH) 41776a: Late dorsal vertebrae.

NHMUK PF (old BMNH) 41776b: A caudal centrum.

NHMUK PF (old BMNH) 41958: A left coracoid.

NHMUK PF (old BMNH) 42283:

 

Locality: Isle of Portland, Dorset County, England, Southern United Kingdom.

Horizon: Kimmeridge Clay.

Biostratigraphy:

Age: Kimmeridgian Stage, Middle Malm Epoch, Late Jurassic.

Material:

NHMUK PF (old BMNH) 42283-6: Humeri.

 

Locality: Stokes Wake, Dorset County, England, Southern United Kingdom.

Horizon:

Biostratigraphy:

Age: Kimmeridgian Stage, Middle Malm Epoch, Late Jurassic.

Material:

Dorset County Museum G.145, B.146: Vertebrae.

 

DELAIR, 1966

Locality: Beach at Freshwater Point, near Encombe, Dorset County, England, Southern United Kingdom.

Horizon: Kimmeridge Clay.

Biostratigraphy:

Age: Kimmeridgian Stage, Middle Malm Epoch, Late Jurassic.

Material:

Number: Vertebrae and rib fragments.

V 1225 HMG: Vertebra.

 

DELAIR & WIMBLEDON, 1993

Locality: Okus Quarry, Swindon, Wiltshire County, England, Southern United Kingdom.

Horizon: ‘oolite’, Portland Stone.

Biostratigraphy:

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

Material:

SwM: Centa.

CRYNH: Humerus.

 

= Ichthyosaurus trigonus? MOON & KIRTON, 2016

Locality: Foxhangers, Wiltshire, England, Southern United Kingdom.

Horizon: Kimmeridge Clay Formation.

Biostratigraphy:

Age: Kimmeridgian Stage, Middle Malm Epoch, Late Jurassic.

Material:

NHMUK 46803: Left femur.

 

Locality: Isle of Portland, Dorset, England, Southern United Kingdom.

Horizon: Kimmeridge Clay Formation.

Biostratigraphy:

Age: Kimmeridgian Stage, Middle Malm Epoch, Late Jurassic.

Material:

NHMUK 42287: Left coracoid.

 

Locality: Shotover Hill, Oxfordshire, England, Southern United Kingdom.

Horizon: Kimmeridge Clay Formation.

Biostratigraphy:

Age: Kimmeridgian Stage, Middle Malm Epoch, Late Jurassic.

Material:

OUMNH J12294, J.12481, J.12487: Vertebral centra.

OUMNH J10502: 2 anterior presacral vertebral centra.

OUMNH J12065: Anterior presacral vertebral centrum.

OUMNH J12484: Anterior presacral centrum.

OUMNH J12064: Posterior presacral vertebral centrum.

OUMNH J12294, J12295: Anterior presacral vertebral centra.

OUMNH J12482, J12483: Atlas-axis complex.

OUMNH J12298, J12478, J10264: Posterior presacral vertebracl centra.

= Macropterygius aff. trigonus

OUMNH J10488: Posterior presacral vertebral column.

 

 

Locality: Buldon, Oxfordshire, England, Southern United Kingdom.

Horizon: Kimmeridge Clay Formation.

Biostratigraphy:

Age: Kimmeridgian Stage, Middle Malm Epoch, Late Jurassic.

Material:

OUMNH J12480: Posterior presacral vertebral centrum.

 

Locality: Unrecorded, England, Southern United Kingdom.

Horizon: Unrecorded.

Biostratigraphy:

Age: Middle Jurassic.

Material:

OUMNH J12471: Anterior presacral vertebral centrum.

 

Locality: Unrecorded, England, Southern United Kingdom.

Horizon: Kimmeridge Clay Formation.

Biostratigraphy:

Age: Kimmeridgian Stage, Middle Malm Epoch, Late Jurassic.

Material:

OUMNH J48734: Posterior presacral vertebral centrum.

 

Locality: Swindon, Wiltshire, England, Southern United Kingdom.

Horizon: Kimmeridge Clay Formation.

Biostratigraphy:

Age: Kimmeridgian Stage, Middle Malm Epoch, Late Jurassic.

Material:

OUMNH J48735, J48736: Posterior presacral vertebral centrum.

OUMNH J10387: Right coracoid.

 

 

SAUVAGE, 1894

Locality: Boulannais, France.

Horizon: Portlandian.

Biostratigraphy:

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

Material:

Number: Not given:

 

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