Genus: Grendelius McGOWAN, 1976
Etymology: For Grendel, a monster in the Beowulf epic, who came from he Fens in the Region of the Oxford Clas, England, where the fossil was found.

Species: mordax McGOWAN, 1976
Etymology: Latin, mordax, "bitting."

Holotype: SMC J68516

Locality: Great Ouse Folld Relief Channel, about 100m south of the bridge at Stowbridge, 12 km south of King's Lynn, Norfolk County, England, Southern United Kingdom.

Horizon: Kimmeridge Clay.

Biostratigraphy: Pectinatites wheatleyensis zone.

Age: Early Volgian, Tithonian Stage, Malm Epoch, Late Jurassic.

Material: Skull, isolated centra, ribs and some girdle fragments.

Referred material:

TAYLOR, & CRUICKSHANK, 1993

Locality: Eastern end of the Kimmeridge Ledges, National grid reference SY 9387 7729, Dorset County, England, Southern United Kingdom.

Horizon:

Biostratigraphy:

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

Material:

BRSMG Ce16696: Partial skeleton.

Species: pseudoscythicus (EFIMOV, 1997) ZVERKOV, ARKHANGELSKY, & STENSHIN, 2015
= Ostchevia pseudoscythica EFIMOV, 1997
Etymology: From the pseudoscythica Zone, where the fossils of the ichthyosaur were found.
= Brachypterygius pseudoscythicus (EFIMOV, 1997) MAISCH & MATZKE, 2000

Holotype: PMU 3/100

Locality: Right bank of the River Volga, 8 km to the east of the Village of Novaya Beden’ga of Ulyanovsk District, Ulyanovsk Region, European Russia.

Horizon:

Biostratigraphy: Ilowaiskya pseudoscythica Zone.

Age: Lower Substage, Volgian, Tithonian Stage, Malm Epoch, Late Jurassic.

Material: Occipital region, pariteials, nasals, jaw bones, teeth, pectoral girdle, forelimbs, vertebral column, (60 vertebrae).

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Species: zhuravlevi (ARKHANGELSKY, 1998) ZVERKOV, ARKHANGELSKY, & STENSHIN, 2015
Etymology: In honor of K. I. Zhuravlev.
= Brachypterygius zhuravlevi ARKHANGELSKY, 1998
= Otschevia zhuravlevi (ARKHANGELSKY, 1998) ARKHANGELSKY, 2000

Holotype: PIN no. 426/60-76

Locality: Savel’evskii Shale Mine near the village of Gorni, Krasnopartizanskii District, Saratov Region, European Russia.

Horizon:

Biostratigraphy: Dorsoplanites panderi Zone.

Age: Middle Substage of the Volgian, Tithonian Stage, Malm Epoch, Late Jurassic.

Material: Left humerus with the elements of the epipodium and autopodium.

Referred material:

ARKHANGELSKY, 2000

Locality: Kashpirskoe Pyroshale Field (Mine no. 3), Syzranskii District, Samara Region, European Russia.

Horizon:

Biostratigraphy: Lower part of the Dorsoplanites panderi Zone.

Age: Middle Substage of the Volgian, Tithonian Stage, Malm Epoch, Late Jurassic.

Material:

SRM Hb 30192: Occipital doncyles, fragmentary lower jaw, incomplete vertebral column, fragmentary ribs, both humeri, elements of epipodium and autopodium and right femur of one individual.

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Species: alekseevi (ARKHANGELSKY, 2001 ZVERKOV, ARKHANGELSKY, & STENSHIN, 2015
Etymology: In honor of the late geologist A. V. Alekseev from Ulyanovsk.
= Otschevia alekseevi ARKHANGELSKY, 2001

Holotype: Ulyanovsk Regional Musum, YKM (old URM) 56702

Locality: Right bank of the Volga River, 18 km north of Ulyanovsk, Ulyanovsk District, Ulyanovsk Region, European Russia.

Horizon:

Biostratigraphy: Dorosplanites panderi Zone.

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

Material: Fragmentary skull, humeral girdle, forelimbs, vertebral column (60 vertebrae) and ribs.