Genus: Microcnemus HUENE, 1940
Etymology: Greek, micro, "small, tiny" and Greek, cneme, "leg."

Species: efremovi HUENE, 1940
Etymology: In honor of Ivan E. Efremov.

Holotype: PIN 2252/387

Locality: Dwina, and Mesen-Bekens, European Russia.

Horizon:

Biostratigraphy: Zone V (Benthosuchus Zone).

Age: Early Triassic.

Material: 15 dorsal vertebrae, 17 caudal vertebrae, 2 humeri, radius, ulna, 10 femora, 11 tibia, 1 fibula, 10 fragments of bones, scapula-coracoid, maxilla, dentary missing anterior end.

Referred material:

= Chasmatosuchus? parvus HUENE, 1940 (nomen dubium) (as per SENNIKOV, 1995)
Etymology: Latin, parvus, "small, petite."

Holotype: PIAS USSR No. 19-2252/382

Locality: 1a, by the mill, Vakhnyevo, Vologda region, Northern European Russia.

Horizon:

Biostratigraphy: Zone V.

Age: Early Olenekian, Vetluga stage, Upper Nammalian-Spathian Stage, Upper Scythian Epoch, Early Triassic.

Material: Small cervical vertebra.