The genus Paracimexomys ("beside Cimexomys") was named by Archibald J.D. in 1982. Paracimexomysfossils were originally referred to as Cimexomys, until it was realized they were different enough to justify a genus of their own.
Species
Paracimexomys magister also known as Cimexomys magister- Remains were found in the Upper
Santonian (Upper Cretaceous) of
Utah, USA. The animal probably weighed about 100g when it was alive.
Paracimexomys magnus also known as Cimexomys magnus- were found in the
Campanian (Upper Cretaceous) strata of the Judith River Formation in
Montana, USA.
Paracimexomys priscus- Fossil remains were found in the
Maastrichtian (Upper Cretaceous) of Hell Creek, Montana. Remains were first found in 1966. The holotype is in the collection of the
University of Alberta, where the name Cimexomys is favoured. Weight is estimated to have been 60g.
Misassigned species
Paracimexomys crossi- Remains have been found in the Middle Cretaceous (Upper
Aptian to lower
Albian)
Antlers Formation of
Oklahoma, USA. Based on a tiny tooth, this was the first reported Oklahoma Mesozoic mammal. It's also the oldest known member of the informal Paracimexomys group. The species' name honours the prison officer Bobby Cross, who has found this and other fossils.
Paracimexomys perplexus- Found in the late
Albian to early
Cenomanian (Upper Cretaceous) in the Cedar Mountain Formation of Utah.
Paracimexomys robisoni- Found in the Middle Cretaceous strata of the Cedar Mountain Formation of Utah. This type of fossil can be found in the Oklahoma Museum of Natural History. This mouse-sized animal weighed about 25g.
Paracimexomys bestia is now the type species of Cedaromys.
References
^Hunter, J. P; Heinrich, R. E. & Weishampel, D. B. (2010). "Mammals from the St. Mary River Formation (Upper Cretaceous), Montana". Journal of Vertebrate Paleontology. 30 (3): 885–898.
doi:
10.1080/02724631003763490.
S2CID128823128.
Further reading
Sahni, A (1972). "The vertebrate fauna of the Judith River Formation, Montana. Bulletin of the AMNH". Bulletin of the American Museum of Natural History. 147. article 6.
hdl:
2246/1099.
Cifelli (1997). "First notice on Mesozoic mammals from Oklahoma". Oklahoma Geology Notes. 57: 4–17.
Archibald (1982), "A study of Mammalia across the Cretaceous-Tertiary boundary in Garfield County, Montana". Univ. of Calif Publ Geol Sci122 xvi, p. 1-286.
Eaton, J; Nelson, M (1991). "Multituberculate mammals from the Lower Cretaceous Cedar Mountain Formation, San Rafael Swell, Utah". Contributions to Geology. 29 (1): 1–12.
The genus Paracimexomys ("beside Cimexomys") was named by Archibald J.D. in 1982. Paracimexomysfossils were originally referred to as Cimexomys, until it was realized they were different enough to justify a genus of their own.
Species
Paracimexomys magister also known as Cimexomys magister- Remains were found in the Upper
Santonian (Upper Cretaceous) of
Utah, USA. The animal probably weighed about 100g when it was alive.
Paracimexomys magnus also known as Cimexomys magnus- were found in the
Campanian (Upper Cretaceous) strata of the Judith River Formation in
Montana, USA.
Paracimexomys priscus- Fossil remains were found in the
Maastrichtian (Upper Cretaceous) of Hell Creek, Montana. Remains were first found in 1966. The holotype is in the collection of the
University of Alberta, where the name Cimexomys is favoured. Weight is estimated to have been 60g.
Misassigned species
Paracimexomys crossi- Remains have been found in the Middle Cretaceous (Upper
Aptian to lower
Albian)
Antlers Formation of
Oklahoma, USA. Based on a tiny tooth, this was the first reported Oklahoma Mesozoic mammal. It's also the oldest known member of the informal Paracimexomys group. The species' name honours the prison officer Bobby Cross, who has found this and other fossils.
Paracimexomys perplexus- Found in the late
Albian to early
Cenomanian (Upper Cretaceous) in the Cedar Mountain Formation of Utah.
Paracimexomys robisoni- Found in the Middle Cretaceous strata of the Cedar Mountain Formation of Utah. This type of fossil can be found in the Oklahoma Museum of Natural History. This mouse-sized animal weighed about 25g.
Paracimexomys bestia is now the type species of Cedaromys.
References
^Hunter, J. P; Heinrich, R. E. & Weishampel, D. B. (2010). "Mammals from the St. Mary River Formation (Upper Cretaceous), Montana". Journal of Vertebrate Paleontology. 30 (3): 885–898.
doi:
10.1080/02724631003763490.
S2CID128823128.
Further reading
Sahni, A (1972). "The vertebrate fauna of the Judith River Formation, Montana. Bulletin of the AMNH". Bulletin of the American Museum of Natural History. 147. article 6.
hdl:
2246/1099.
Cifelli (1997). "First notice on Mesozoic mammals from Oklahoma". Oklahoma Geology Notes. 57: 4–17.
Archibald (1982), "A study of Mammalia across the Cretaceous-Tertiary boundary in Garfield County, Montana". Univ. of Calif Publ Geol Sci122 xvi, p. 1-286.
Eaton, J; Nelson, M (1991). "Multituberculate mammals from the Lower Cretaceous Cedar Mountain Formation, San Rafael Swell, Utah". Contributions to Geology. 29 (1): 1–12.