Named By: G. I. Tverdokhlebova & M. F. Ivakhnenko - 1984.
Synonyms: Seymouria agilis, Tokosaurus.
Classification: Chordata, Reptilia, Parareptilia, Procolophonomorpha, Procolophonia, Nycteroleteridae.
Species: M. poezicus (type), M. agilis.
Size: About 75 centimetres long.
Known locations: USA, Oklahoma - Chickasha Formation. Russia - Krasnoshchel' Formation.
Time period: Wordian of the Permian.
Fossil representation: Based upon an almost complete and articulated skeleton and skull.
For its type Macroleter were fairly large predators that were procolopophonid parareptiles. One former species of Seymouria, S. agilis has been re-assigned as a second species of Macroleter. This makes the type species of Macroleter, M. poezicus known from Russia, and the second species, M. agilis known from the USA. There is also speculation that the genus Tokosaurus may actually be a synonym to Macroleter.
- Nikteroletery iz Permskikh Otlozheniy Vostochnoy Evropy [Nycteroleters from the Permian of Eastern Europe]. - Paleontologicheskii Zhurnal 1984(3):98-111. - G. I. Tverdokhlebova and M. F. Ivakhnenko - 1984.
- The reptile Macroleter: First vertebrate evidence for correlation of Upper Permian continental strata of North America and Russia. - Geological Society of America Bulletin 113 (9): 1229–1233. - Michel Laurin & Robert R. Reisz - 2001.
- Anatomy of Emeroleter levis and the phylogeny of the nycteroleter parareptiles. - Journal of Vertebrate Paleontology 32 (1): 45–67. - Linda A. Tsuji, Johannes Müller & Robert R. Reisz - 2012.