Species: extremus (BOULENGER, 1904) HUENE, 1922
Etymology:
= Ichthyosaurus extremus BOULENGER, 1904
Holotype: NHMUK PV (old BMNH R) 3177
Locality: Smallmouth Sands, Weymouth, (SY 669764-SY 672772), Dorset County, England, Southern United Kingdom.
Horizon: Lower Kimmeridgian Clay.
Biostratigraphy:
Age: Early Kimmeridgian Stage, Middle Malm Epoch, Late Jurassic.
Material: Humerus, ulna, radius and phalanges.
Referred material:
FERNANDEZ, 1997
Locality: Ankilivalo, Tulear Province, Madagascar.
Horizon:
Biostratigraphy:
Age: Portlandian Stage, Middle Tithonian Stage, Upper Malm Epoch, Late Jurassic.
Material:
CM 47525: An isolated basiocciptial.
= cf. Brachyptrygius cf. extremus MADZIA, SZCZYGIELSKI & WOLNIEWICZ, 2021
(Note: Originally referred to Ophthalmosauridae indet)
Locality: Czarnoglowy (Zanglaff), Krzyzanowice, Poland.
Horizon:
Biostratigraphy:
Age: Kimmeridigian stage, Malm Epoch, Late Jurassic.
Material:
GG303-29: Vertebral centrum.
MOON & KIRTON, 2018
Locality: Kimmeridge Bay, Dorset County, England, Southern United Kingdom.
Horizon: Lower Kimmeridgian Clay.
Biostratigraphy:
Age: Early Kimmeridgian Stage, Middle Malm Epoch, Late Jurassic.
Material: BRSMG Ce 16696: A largely complete but only partially prepare specimen, skull and right forelimb and partial distal left forelimb.
Locality: Ely, Cambridgeshire County, England, Southern United Kingdom.
Horizon: Lower Kimmeridgian Clay.
Biostratigraphy:
Age: Early Kimmeridgian Stage, Middle Malm Epoch, Late Jurassic.
Material:
CAMSM J29864: A forelimb.
CAMSM J61348: A basisphenoid.
CAMSM J67556: Right humerus.
Locality: Stowbridge, Norfolk County, England, Southern United Kingdom.
Horizon: Lower Kimmeridgian Clay.
Biostratigraphy:
Age: Early Kimmeridgian Stage, Middle Malm Epoch, Late Jurassic.
Material:
CAMSM J68516, TN 571.11: A large but poorly preseed skull with associated post cranial elements.
Locality: Mepal, Cambridgeshire County, England, Southern United Kingdom.
Horizon: Lower Kimmeridgian Clay.
Biostratigraphy:
Age: Early Kimmeridgian Stage, Middle Malm Epoch, Late Jurassic.
Material:
CAMSM X39251: A largely complete but disarticulated skeleotn.
Locality: Encombe Bay, Dorset County, England, Southern United Kingdom.
Horizon: Lower Kimmeridgian Clay.
Biostratigraphy:
Age: Early Kimmeridgian Stage, Middle Malm Epoch, Late Jurassic.
Material:
NHMUK (PV) R8693: Pectoral girdle and forelimb elemetns.
Locality: Weymouth, Dorset County, England, Southern United Kingdom.
Horizon: Lower Kimmeridgian Clay.
Biostratigraphy:
Age: Early Kimmeridgian Stage, Middle Malm Epoch, Late Jurassic.
Material:
NHMUK (PV) 40337: A basisphenoid.
NHMUK (PV) 41776, 45905, 45907: Basioccipitals.
Locality: Smallmouth Sands, near Weymouth, Dorset County, England, Southern United Kingdom.
Horizon: Lower Kimmeridgian Clay.
Biostratigraphy:
Age: Early Kimmeridgian Stage, Middle Malm Epoch, Late Jurassic.
Material:
WETM 1978.219: A left forelimb.
Locality: Isle of Portland, Dorset County, England, Southern United Kingdom.
Horizon: Lower Kimmeridgian Clay.
Biostratigraphy:
Age: Early Kimmeridgian Stage, Middle Malm Epoch, Late Jurassic.
Material:
NHMUK (PV) 42284: A right humerus.
NHMUK (PV) 42286: A left humerus.
Locality: Swindon, Wiltshire County, England, Southern United Kingdom.
Horizon: Lower Kimmeridgian Clay.
Biostratigraphy:
Age: Early Kimmeridgian Stage, Middle Malm Epoch, Late Jurassic.
Material:
NHMUK (PV) 45984: A basioccipital and basisphenoid.
NHMUK (PV) 45986: A left articular.
NHMUK (PV) 47326: A basisphenoid.
Locality: Swindon, Wiltshire County, England, Southern United Kingdom.
Horizon: 'Portland Rock' (Portland Stone Formation).
Biostratigraphy:
Age: Middle Tithonian Stage, Malm Epoch, Late Jurassic.
Material:
OUMNH J1585: A left humerus.
OUMNH J1586: A rigth humerus.
OUMNH J1608: Left humerus.
OUMNH J 1627: A basioccipital.
Locality: Cumnor, Oxfordshire County, England, Southern United Kingdom.
Horizon: Lower Kimmeridgian Clay.
Biostratigraphy:
Age: Early Kimmeridgian Stage, Middle Malm Epoch, Late Jurassic.
Material:
OUMNH J68543: Basioccipital.