Species: romeri EFREMOV, 1940
Etymology: In honor of Alfred S. Romer.
Holotype: PIN 158/1
Locality: Kimja River, an affluent of the Mezen River, Archangel Province, European Russia.
Horizon:
Biostratigraphy: Zone III.
Age: Lower Part of the Kazanian Substage, Wodian-lower Capitanian Stage, Guadelupian Stage, Lower Zechstein Epoch, Early Late Permian.
Material: Skull.
Old skull reconstruction.The skull is dorsally/ventrally crushed.
New reconsturction
Referred material:
IVAKHENKO, 1991
Numbers: Not given: 20 specimens, skulls, and skeletons.
REISZ, 1997
Mezen River basin of northern Russia. REISZ is conisdered to be a pelycosaur similar to Mycterosaurus.
REISZ & BERMAN, 2001
PIN 3586/8a: Partial skull of a large individual.
PIN 3706/11, 3706/15: Partial skulls of juveniles.
SGU 1-4V/1558: Partial skull similar in size to holotype.
IVAKHNENKO, 2008b
Locality: Glyadnaya Shchel’ya locality, Mezenskii District, Arkhangelsk Region, European Russia.
Horizon: Krasnoshchel’ya Formation, Urzhumian Horizon.
Biostratigraphy: Mezen Faunal Assemblage.
Age: Lower Tatarian Age, Capitanian Stage, Middle Zechstein Epoch, Late Middle Permian.
Material: Not given.
Locality: Ust’Peza (Ust-Pyoza), Arkhangelsk Region, Mezenskii (Mezen) District, Arkhangel'sk Region, Russia.
Horizon: Biarmin Series, Urzhumina Stage, Urzhumian Horizon, Upper Kimzha beds.
Biostratigraphy: Mezen Faunal Assemblage.
Age: Lower Tatarian Age, Capitanian Stage, Middle Zechstein Epoch, Late Middle Permian.
Material:
Numbers: Not given:
Locality: Peza-1 (Pyoza-1), Peza River, right tributary of Mezen' River, Arkhangelska Region, Mezenskii (Mezen) District, European Russia.
Horizon: Biarmian Series, Upper Kimzha beds, Urzhumian Stage, Urzhumian Horizon.
Biostratigraphy: Mezen Faunal Assemblage.
Age: Lower Tatarian Age, Lopingian Subepoch, upper Zechstein Epoch, Late Permian.
Material:
Numbers: Not given:
Locality: Ust’-Nyafta settlement, right tributary of Mezen' River, Peza River, Arkhangel'sk Region, European Russia.
Horizon: Leshukonsk Member, Krasnoschelsk Formation, Biarmian Series, Upper Kimzha beds, Urzhumian Stage, Upper Urzhumian Horizon.
Biostratigraphy: Mezen Faunal Assemblage.
Age: Lower Tatarian Age, Capitanian Stage, Upper Guadelupian Stage, Middle Zechstein Epoch, Late Middle Permian.
Material:
Numbers: Not given:
Locality: Ust-Vashka Locality, Leshukonskii District, Arkhangelsk Region, European Russia.
Horizon: Krasnoshchel’ya Formation, Biarmian Series, Urzhumian Stage, Urzhumian Horizon.
Biostratigraphy: Mezen Faunal Assemblage.
Age: Lower Tatarian Age, Capitanian Stage, Middle Zechstein Epoch, Late Middle Permian.
Material:
Numbers: Not given:
Locality: Nyisagora locality, 4543/n, on the Mezen River, near the juction with the Vashka River, Leshukonskii District, Arkhangelsk Region, European Russia.
Horizon: Biarmian Series, Urzhumian Stage, Urzhumian Horizon, Zone II.
Biostratigraphy: Mezen Faunal Assemblage.
Age: Earliest early Tatarian Age, Guadelupian Stage, Middle Zeichstein Epoch, Middle Permian.
Material:
Numbers: Not given:
Locality: Belukur’e locality, Mezenskii District, Arkhangelsk Region, European Russia.
Horizon: Biarmian Series, Krasnoshchel’ya Formation, Urzhumian Stage, Urzhumian Horizon.
Biostratigraphy: Mezen Faunal Assemblage.
Age: Lower Tatarian Age, Capitanian Stage, Middle Zechstein Epoch, Late Middle Permian.
Material:
Numbers: Not given:
Locality: Kosmogorodsko'e Locality, Mezenskii District, Arkhangelsk Region, European Russia.
Horizon: Biarmian Series, Urzhumian Stage, Urzhumian Horizon.
Biostratigraphy: Mezen Faunal Assemblage.
Age: Lower Tatarian Age, Capitanian Stage, Middle Zechstein Epoch, Late Middle Permian.
Material:
Number: Not given:
Locality: Dorogaya Gora Locality, Mezenskii District, Arkhangelsk Region, European Russia.
Horizon: Biarmian Series, Urzhumian Stage, Urzhumian Horizon.
Biostratigraphy: Mezen Faunal Assemblage.
Age: Lower Tatarian Age, Capitanian Stage, Middle Zechstein Epoch, Late Middle Permian.
Material:
Number: Not given:
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Species: efremovi MAHO, GEE & REISZ, 2019
Etymology: In honor of the famous Russian palaeontologist Ivan Efremov, who erected the genus, and is recognised as one of the leaders in the field in his country.
Holotype: OMNH 73209
Locality: Fort Sill, OMNH Locality V51, Dolese Brothers limestone quarry at Richards Spur, Fissure Fills, just west of U.S. Highways 62 & 281, 10.5 miles south of Apache, 6 miles north of Fort Sill, SW 1/2, Sec. 31, T4N, R11W, Comanche County, Oklahoma.
Horizon: Wellington Formation (Garber Formation), Summer Group, Arbuckle limestone, (Probably equivalent to the Arroyo Formation of Texas).
Biostratigraphy:
Age: Leonardian Stage, Lower Rotliegendes Epoch, Early Permian.
Material: Nearly complete skull and mandible.
Refrred material:
OMNH 73500: A nearly complte skull and mandibles.
OMNH 73208: Nearl comlete skull and left mandible.