Genus: Arthropterygius MAXWELL, 2010
Etymology: Greek, arthro-, "jointed" and Greek, pterygium, "wing-like": referring to the socketed articulation between the distal humerus and proximal radius and ulna.

Species: volgensis (KAZANSKY, 1903) ZVERKOV & PRILEPSKAYA, 2019
Etymology: In reference to the Volga Region, European Russia.
= Ichthyosaurus volgensis KAZANSKY, 1903 (nomen dubium)
= Otschevia volgensis (KAZANSKY, 1903) EFIMOV, 1997

Holotype: KSU 982/P-213

Locality: Berezoviy Dol Ravine near Novaya Racheika Village, Syzran District, Samara Region, European Russia. (Gorodischii, Near Ul’yanovskk, Volga Region, European Russia?).

Horizon: Promza Formation.

Biostratigraphy: Dorsoplanites panderi Ammonite Biozone (Vigatites virgatus zone?).

Age: Early Middle Volgian Substage, Tithonian Stage, Late Jurassic.

Material: Basisphenoid, opisthotics, quadrates, parietals, right supratemporal, and articular, 3 posterior caudal and tailfin vertebrae, neural arches and rib fragments, coracoids, fragments of the interclavicle, scapula, and clavicles, and distal portion of the femur.

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Species: chrisorum (RUSSELL, 1993) MAXWELL, 2010
= Ophthalmosaurus chrisorum RUSSELL, 1993
Etymology:

Holotype: CMN 40608

Locality: 76°9'N, 113°30'W (approximate), Cape Grassy, Melville Island, Northwest Territories, Canada.

Horizon: Ringnes Formation.

Biostratigraphy:

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

Material: Basioccipital, basiphenoid, partial right and left articulars, atlas-axis complex, 3 cervical/anterior dorsal centra, 2 anterior audal centra, 2 posterior caudal centra, neural spine, partial right adn left scapulae, right coracoid, right and left humeri, right andleft radii, ulnae, and preaxial elements, right and left intermedia, isolated manual phalanges, right and left femora.

Referred material:

CMN 40609: Partial scapula and several vertebrae.

 

ZVERKOV & PRILEPSKAYA, 2019

Locality: Berghaus Island, Franz Josef Land, Asian Russia High Artic.

Horizon: Upper part of the Hofer Formation.

Biostratigraphy:

Age: Early Berriasian Stage, Lower Neocomian Subepoch, Lowermost Early Cretaceous Epoch, Earliest Cretaceous.

Material:

CMGE 3-16/13328: Left quadrate, partial basisphenoid, incomplete supratemporals, fragmentary parietal, and several other indeterminate cranial fragments, incomlpete vertebral colum (69 vertebrae from anterior dorsal to tailfin centra), rib fragments, right forefin, right scapula, and coracoids of a juvenile.

CMGE 17-44/13328: Right nasal, prefrontals, right postfrontal, fragmentary parietal, basisphenoid, left quadrate, fragments of palate bones and other indeterinate cranial remains, mandible, including articulated left surangular, angular, splenial and prearticular, isolated presacral and anterior caudal centra (31 fragment), multple rib fragments, fragments of pectoral girdle (coracoids, scapulae, interclavicle and clavicle), incomplte right forefin, proximal part of left humerus, left radius, partial ischiopubis, and left femur of a juvenile.

 

= Arthropterygius cf. chrisorum

Locality: Right back of the Volga River near Gorodischi Village, Ulyanovsk Region, European Russia.

Horizon: Promza Formation.

Biostratigraphy: Dorsoplanites panderi Ammonite Biozeon.

Age: Early Middle Volgian Substage, Tithonian Stage, Late Jurassic.

Material:

SGM 1743-s: Isoalted basisphenoid.

 

= Palvennia hoybergeti DELSETT, DRUCKENMILLER, ROBERTS, & HURUM, 2018 (referred material)

Locality: North side of Janusfjellet, approximately 13 km northeast of Longyearbyen, Arctic Archipelago of Svalbard, Norway.

Horizon: 15.2 meters below the Dorsoplanites Bed, Slottsmøya Member, Agardhfjellet Formation.

Biostratigraphy: Dorsoplanites ilovaiskyi to Dorsoplanites maximus ammonite zone.

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

Materal:

PMO 222.669: Fragmentary skull and front half of skeleton.

 

= Opthalmosaurus cf. thyreospondylus BOGOLUBOV, 1910

Locality: Right back of the Volga River between Ulyanovsk and Gorodischi, Ulyanovsk Region, European Russia.

Horizon: Promza Formation.

Biostratigraphy: Dorsoplanites panderi Ammonite Biozeon.

Age: Early Middle Volgian Substage, Tithonian Stage, Late Jurassic.

Material:

SGM 1573: 10 vertebrae, interclavicle, broken distal portion of the scapula and left humerus.

 

= Ophthalmosauridae indet DELSETT, ROBERTS, DRUCKENMILLER, & HURUM, 2017, DELSETT, DRUCKENMILLER, ROBERTS, & HURUM, 2018

Note: ZVERKOV & PRILEPSKAYA, 2019 refer Keilhauia to Arthropterygius cf. chrisorum.

Locality: Island of Spitsbergen, Wimanfjellet, approximately 14 km north of Longyearbyen, Svalbard, Norway.

Horizon: Slottsmoya Member, Agardhfjellet Formation, Janusfjellet Subgroup.

Biostratigraphy:

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

Material:

PMO 224.250: Partial basioccipital and a nearly complete pectoral girdle and forefins.

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Species: thalassonotus CAMPOS, FERNANDEZ & HERRERA, 2019
Etymology: Greek, thalassa, "the sea" and Greek, notos, "south," because the species swam in southern seas.

Holotype: MOZ-PV 6145

Locality: Yesera del Tromen-Pampa Tril area, north-western Neuquen Province, Patagonia, Argentina.

Horizon: Vaca Muerta Formation, Mendoza Group.

Biostratigraphy:

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

Material: A partial skeleton consisting of a skull lacking the anterior portion of the rostrum and a partly articulated right forelimb.