Genus: Pessopteryx WIMAN, 1910
Etymology: Greek, pessos, “round stone game-piece for playing draughts or checkers” and Greek, pteryx, “wing, fin”: Game-piece fin (Damsteinflosse).
= Merriamosaurus MAISCH & MATZKE, 2002
Etymology: In honor of John C. Merriam, for his outstanding contributions to the undrstanding and knowledge of Ichthyosaurs, and Greek, sauros, "lizard."
= Rotundopteryx MAISCH & MATZKE, 2000 non DUCKHOUSE, 1990
Etymology: Latin, rotundus, "round" and Latin, pteryx, "wing or fin."Chosen because of the rounded shape of the humerus andmost of the referred fin elements of this ichthyosaur.

Species: nisseri WIMAN, 1910
Etymology:
= Omphalosaurus nisseri (WIMAN, 1910) MERRIAM & BRYANT, 1911 (partim)

Holotype:

Locality: Isfjord, Spitsbergen, Svalbard Island, Norway.

Horizon:

Biostratigraphy:

Age: Late Triassic.

Material: Fragmentary skull and fragmentary skeleton.

Referred material:

ENGELSCHION, DELSETT, ROBERTS & HURUM, 2018

Locality: Marmierfjellet, northeast of Longyearbyen, Spitsbergen, Svalbard Island, Norway.

Horizon: Lower Saurian Niveau, Vendomdalen Member, Vikinghogda Formation.

Biostratigraphy:

Age: Spathian Stage, Latest Scythian Epoch (Early Triassic Epoch), Late Early Triassic.

Material:

PMO 229.778, 779, 780, 781, 782: near-complete humeri.

PMO 230.159: Fragmentary humerus.

= Merriamosaurus hulkei (MAISCH & MATZKE, 2000) MAISCH & MATZKE, 2002
Etymology: In honor of John Whittaker Hulke, renowned British palaeoherpetologist of the 19th century, who was the fist to describe Triassic ichthyosaurs from Spitsbergen.
= Rotundopteryx hulkei MAISCH & MATZKE, 2000

Holotype: Palaeontologiscal Museum of the University of Upsala.

Locality: Middlhook, Isfjord, Spitsbergen, Svalbard Island, Norway.

Horizon: Lower Saurian Niveau.

Biostratigraphy:

Age: Spathien Stage, Upper Scythien Epoch, Early Triassic.

Material: A complete humerus.

Referred material:

Number: Not given: 4 humeri, zeugopodials, podials, femora and ?fibulae and tibae.

 

BUCHY, TAUGOURDEAU & JANIVER, 2002, 2004

Locality: Mont Ibsen, Dickson Land, Spitsbergen, Svalbard Island, Norway.

Horizon:

Biostratigraphy:

Age: Spathian Stage, Upper Scythian Epoch, Middle Triassic.

Material:

SVT 203: Fragmentary skeleton.
Note: Stomach contents of remnants of belemnoid cephalopods, and remains of annelids.

Note: Orginally referred to Grippia longirostris.

MAISCH & MATZKE, 2003

Locality: Mont Ibsen, Dickson Land, Spitsbergen, Svalbard Island, Norway.

Horizon:

Biostratigraphy:

Age: Spathien Stage, Upper Scythien Epoch, Early Triassic.

MNHN A27 Ibsen 1964/69: Fragment of the right sied of the skull roof.

MNHN A 27 Ibsen 1964: Skull roof.

MNHN A27 Ibsen 1964: Incomplete ischium.

MNHN A27 Ibsen 1964: Incomplete ischium.

MNHN A27 Ibsen 1964: Popodial.

MNHN A27 Ibsen 1964: Popodial.

MNHN A27 Ibsen 1964: Large radius.

MNHN A 27 Ibsen 1969: Juvenile left scapula, glenoid region.

MNHN A27 Ibsen 1969: Proximal view of a somewhat larger left scapula.

MNHN SVT 218, 293: Humeri.

MNHN SVT 224 (A27 Mt. Ibsen 1964): Left tibia.

MNHN SVT 227 (A27 Ibsen 1964): Right tibia.

MNHN SVT 230 (A27 Mt Ibsen 1964): Right femur.

MNHN SVT 234 (A27 Mt Ibsen 1964): Left femur.

MNHN SVT 249 (A27 Mt. Ibsen 1969): Left fibula.

MNHN SVT 270 (A27 Mt. Ibsen 1964: Popodial.

MNHN SVT 292 (A27 Mt. Ibsen 1964): Juvenile humerus.

MNHN SVT 241: Incomplete intermedium (Labeled A 28 VW Heimen).

MNHN SVT 244 (A27 Ibsen 1964): Right fibula.

MNHN A 17 Ibsen 1964: Skull roof fragment from the right side of a small individual.

MNHN A 35 Viking 1969: Middle thoracal pleurocentrum.

MNHN A 17 Ibsen 1964: Proximal end of a left clavicle:

 

Locality: Mount Kongress, Dickson Land, Spitsbergen, Svalbard Island, Norway.
Horizon:

Biostratigraphy:

Age: Ladinian Stage, Upper Mid Triassic Epoch- Carnian Stage, Lower Late Triassic Epoch, Late Triassic.

Material:

MNHN KOL Kongress 1969: Proximal half an adult right clavicle.

MNHN KOL Kongress1969: Lateral half of a right coracoid.

MNHN KOL Kongress 1969: Incomplete medial half of a right Coracoid.

MNHN KOL Kongress 1969: Possible scapula fragment.

MNHN KOL Kongress 1969: Glenoid region of a right scapula.

MNHN KOL Kongress 1969: Scapula and coracoid.

MNHN KOL Kongress 1969: Proximal end of left ilium.

MNHN KOPD Kongress 1969: Posterior caudal pleurocentrum.

MNHN KOD Kongress 1969: Posterior caudal pleurocentrum.

MNHNKOD Knogress 1969: Posterior caudal pleurocentrum

MAISCH & MATZKE, 2002

Locality: Mt. Heimen, Isfjord, Spitsbergen, Svalbard Island, Norway.

Horizon: Lower Saurian Niveau, Sticky Keep Formation.

Biostratigraphy:

Age: Spathien Stage, Upper Scythien Epoch, Early Triassic.

Material:

MNHN A 28 VW: Fragment of skull roof, posteriormost part of the left supraangular, left articular, left humerus, atlas, anterior caudal, posterior and anterior thoracal, cervical vertebrae, neural arch, anterior left thoracial rib, radius, ulna, fragmentary left scapula, and podial elements.

 

= Pessopteryx nisseri MAZIN 1983

Locality: Mont Ibsen, Dickson Land, Spitsbergen, Svalbard Island, Norway.

Horizon: Upper Sticky Keep Formation, Lower Saurian Niveau.

Biostratigraphy:

Age: Olenekian, Upper Spathian Stage, Upper Scythian Epoch, Early Triassic.

Material:

SVT 219: Humerus and fibula.

SVT 245: Fragment of ulna.

SVT 247: Fragment of fibula.

SVT 239: Distal end of radius.

SVT 236: Radius.

SVT 253: Ulna?

SVT 257: Distal carpal.

SVT 230: Femur and fibula.

SVT 222: Tibia.

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Species: arctica WIMAN, 1910 (nomen dubium)
Etymology:
= Omphalosaurus arctica (WIMAN, 1910) (nomen dubium)

Holotype:

Locality: Isfjord, Spitsbergen, Svalbard Island, Norway.

Horizon: Upper Sticky Keep Formation, lower Saurian Niveau.

Biostratigraphy:

Age: Olenekian, Upper Spathian Stage, Upper Scythian Epoch, Early Triassic.

Material: Fragment of humerus.
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Species: pinguis WIMAN, 1910 (nomen dubium)
Etymology:
= Omphalosaurus pinguis (WIMAN, 1910) (nomen dubium)

Holotype:

Locality: Isfjord, Spitsbergen, Svalbard Island, Norway.

Horizon: Upper Sticky Keep Formation, Lower Saurian Niveau.

Biostratigraphy:

Age: Olenekian, Upper Spathian Stage, Upper Scythian Epoch, Early Triassic.

Material: Humerus.