Genus: Nannopterygius HUENE, 1922
Etymology: Greek, nanos, “dwarf”, Greek, pterygion, “fin” + us: Dwarf fin.
= Enthekiodon HULKE, 1869
Etymology: Greek, en- “in”, Greek, thekon, “small receptacle” and Greek, odon, “tooth”: Encapsulaed tooth.
= Paraophthalmosaurus ARKHANGELSKY, 1997
Etymology: Latin, para, “close”, and Ophthalmosaurus: Close to Ophthalmosaurus
=Yasykovia EFIMOV, 1999
Etymology: The genus is named in memory of the geologist and palaeontologist P. M. Yasykov who first found ichthyosaurs in the vicinity of Simbirsk in 1829.

Species: entheskiodon (HULKE, 1871) HUENE, 1922
Etymology: Greek, en- “in”, Greek, thekon, “small receptacle” and Greek, odon, “tooth.”
= Enthekiodon HULKE, 1869
= Ichthyosaurus enteskinodon HULKE, 1871

Holotype: BMNH 46497

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: 2 fragments of snout.

Referred material:

Fragmentary skull and fragmentary skeleton.

 

DELAIR, 1960

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

Horizon: Kimmeridge Clay.

Biostratigraphy:

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

Material:

NHMUK PV (old BMNH) 46497: Skull and skeleton.

NHMUK PV (old BMNH) 46497a: Proximal portion of a right pelvic limb.

 


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

Horizon: Kimmeridge Clay.

Biostratigraphy:

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

Material:

Number: Not given:

 

MOON & KIRTON, 2018

Locality: Chapman's Pool, Dorset County, Southern United Kingdom.

Horizon: Kimmeridge Clay.

Biostratigraphy:

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

Material:

NHMUK PV R1197: A partial skeleotn with caudal verteral centra, pelvis, adn left forelimb.

 

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

Horizon: Kimmeridge Clay.

Biostratigraphy:

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

Material:

NHMUK PV 46473e: A series of 35 vertebral central.

 

Locality: Peterborough, Cambridgeshire County, England, Southern United Kingdom.

Horizon: Oxford Clay Formation.

Biostratigraphy:

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

Material:

NHMUK PV 47424: Femur.

 

Locality: Fletton, Cambridgeshire County, England, Southern United Kingdom.

Horizon: Oxford Clay Formation.

Biostratigraphy:

Age: Callovian Stage, Dogger Epoch, Middle Jurassic.

Material:

NHMUK PV R5832: 3 cervical vertebrae.

 

/= Ophthalmosaurus DELAR, 1985

Locality: Rope Lake Head, Dorset County, England, Southern United Kingdom.

Horizon: Kimmeridge Clay.

Biostratigraphy:

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

Material:

SOUTUG 15181, 15198, 15348, 16566, 16663: Fragmentary remians.

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Species: ?gaudensis (HULKE, 1871) KUHN, 1934
Etymology:
= Ichthyosaurus gaudensis HULKE, 1871

Holotype:

Locality: Gozo, Malta Island.

Horizon:

Biostratigraphy:

Age: Late Jurassic.

Material: Fragmentary rostrum.
Note: Originally thought to be Miocene in age.

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Species: saveljeviensis (ARKHANGELSKY, 1997) ZVRKOV & JACOBS, 2020
= Paraophthalmosaurus saveljeviensis ARKHANGELSKY, 1997
Etymology: From the name of the Savel’evskii Shale Mine, Saratov Region, European Russia.

Holotype: SSU no. 104a-23

Locality: Savel’evskii shale mine, a brick-field quarry near the village of Gornyi, Krasnopartizanskii District of the Saratov Region, European Russia.

Horizon:

Biostratigraphy:

Age: Lower substage, Volgian Stage, Late Jurassic.

Material: Incomplete skull, large part of the vertebral column with ribs, fragments of the shoulder girdle and limb bones.

Referred material:

= Paraophthalmosaurus saratoviensis ARKHANGELSKY, 1998
Etymology: From the city of Saratov.

Holotype: PRM, no. 2836

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

Horizon:

Biostratigraphy: Virgatites virgatus Zone.

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

Material: Incomplete vertebral column, ribs, fragmentary pectoral girdle and limb bones.

 

= Yasykovia kabanovi EFIMOV, 1999
Etymology: In honor of the paleontologist K. Kabanov for his great contribution to the paleontology of the Ulyanovsk Region.
= Paraophthalmosaurus kabanovi (EFIMOV, 1999) MOON & KIRTON, 1999

Holotype: UPM, no. EP-II-8(1076)

Locality: Gorodischi, near Ulyanovsk, Volga Region, European Russia.

Horizon:

Biostratigraphy: Epivirgaties nikitini Zone, Middle Volgan Substage.

Age: European Russia.

Material: Cranial bones (quadrate and jugal), humeral girdle (Coracoids and left scapula), fore limbs (humeri and phalanges), 4 vertebrae from the posterior thoracic and caudal regions.

Referred material:

UPM, no. EP-II-16 (1202): A fragmentary humeral girdle (left coracoid and right scapula), right humerus, phalanges and 15 vertebrae of the posterior thoracic region.

UPM, no. EP-II-17 (864): Fragmentary cranial bones (articular and quadrate), right coracoid, right and left scapulae, fragmentary pelvic girdle (ischium and pubis), and vertebrae.

 


Locality: Zakhar’evskii Mine, near Ulyanovsk, Volga Region, European Russia.

Horizon:

Biostratigraphy: Kachpurites fulgens zone, Upper Volgian Substage.

Age: Late Jurassic.

Material:

UPM, no. EP-II-15(153): Right and left coracoids.

 


Locality: Children’s Health Center, Nar Ulyanovsk, Volga Region, European Russia.

Horizon:

Biostratigraphy: Craspedites subdites Zone, Upper Volgian Substage.

Age: Late Jurassic.

Material:

UPM, no. EP-II-14 (881): A fragmentary skull (nasals and occipital bones), teeth, right coracoid, scapulae, fore limbs (humeri, ulna, radius, and phalanges), and vertebrae.

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Species: yasykovi (EFIMOV, 1999) ZVRKOV & JACOBS, 2020
Etymology: In honor of P. M. Ysykov.
= Yasykovia yasykovi EFIMOV, 1999
= Paraophthalmosaurus yasykovi (EFIMOV, 1999) ARKHANGEL[SKII, 1999

Holotype: Undory Palaeontological Museum (UPM), no. EP-II-7 (1235)

Locality: Children’s Health Center, Near Uilyanovsk, Volga Region, European Russia.

Horizon:

Biostratigraphy: Craspedites subdites Zone, Upper Volgian Substage.

Age: Late Jurassic.

Material: A fragmentary skeleton, skull, humeral girdle, forelimbs, vertebral column to the lumbar region.

Referred material:

Locality: Gorodishchi, near Ulyanovsk, Volga Region, European Russia.

Horizon:

Biostratigraphy: Virgaties virgatus Zone, Middle Volgian Substage.

Age: Late Jurassic.

Material:

UPM no. EP-II09 (1000): A dismembered but relatively well preserved skeleton including the cranial bones, a tooth, vertebral column (55 vertebrae), and fragments of the fore limbs, and humeral and pelvic girdle.

 

Locality: Kashpir, near Samara, Volga Region, European Russia.

Horizon:

Biostratigraphy: Epivirgatites nikitini Zone, Middle Volgian Substage.

Age: Late Jurassic.

Material:

UPM no. EP-II-10(1160): Isolated bones of the humeral girdle, bones of the fore limbs and vertebrae.

 

Locality: Gorodishchi, near Ulyanovsk, Volga Region, European Russia.

Horizon:

Biostratigraphy: Dorsoplanites panderi Zone, Middle Volgian Substage.

Age: Late Jurassic.

Material:

UPM no. EP-II-13(1151): Anterior part of an intact vertebral column, fragments of the humeral girdle (Scapula, coracoid, and clavicle) and fore limbs (humerus, and phalanges), ribs, and neural arches.

 

= Yasykovia mittai EFIMOV, 1999
Etymology: In honor of the paleontologist V. V. Mitta who found and placed at my disposal the ichthyosaur fossils.

Holotype: UPM, no. EP-II-12 (4-M)

Locality: Khorlovo, Moscow Region, European Russia.

Horizon:

Biostratigraphy: Kachpurites fulgens Zone, Upper Volgian Substage.

Age: Late Jurassic.

Material: Right and left coracoids, and right scapula.

 

= Yasykovia sumini EFIMOV, 1999
Etymology: In honor of the paleontologist D. Sumin who found the Ichthyosaur.

Holotype: UPM, no. EP-II-11(3-M).

Locality: Khorlovo, Moscow Region, European Russia.

Horizon:

Biostratigraphy: Kachpurites fulgens Zone, Upper Volgian Substage.

Age: Late Jurassic.

Material: Occipital bones, anterior part of the vertebral column, coracoids, scapula, interclavicals, clavicle, and fore limbs.

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Species: borealis ZVRKOV & JACOBS, 2020
Etymology: Latin, borealis, "northern."

Holotype: PMO 222.658

Locality: Franz Josef Land, Svalbard, Norway.

Horizon:

Biostratigraphy:

Age: Late Volgian Stage, Latest Tithonian, Malm Epoch, Late Jurassic-Berriasian Stage, Early Neocomian Subepoch, Early Early Cretaceous Epoch, Early Cretaceous.

Material: Partial nasal and several frgments of cranial bones, several vertebrae, coracoids, distal part of the scapula, incomplete left forelimb and proximal portion of the right humerus.

Paratype:

CCMGE 45-46/13328: Right humerus adn caudal vertebra.

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