PBDB Taxon

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Paracimexomys perplexus

Mammalia - Multituberculata

Taxonomy

Paracimexomys perplexus was named by Eaton and Cifelli (2001). Its type specimen is OMNH 27615, a tooth (M1), and it is a 3D body fossil. Its type locality is OMNH V794, Mussentuchit, which is in a Cenomanian crevasse splay mudstone in the Cedar Mountain Formation of Utah.

Sister species lacking formal opinion data

P. robisonae

Synonymy list

Year	Name and author
2001	Paracimexomys perplexus Eaton and Cifelli p. 471
2004	Paracimexomys perplexus Kielan-Jaworowska et al. pp. 254, 320-321

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Rank	Name	Author
kingdom	Animalia	()
—	Bilateria
—	Eubilateria	Ax 1987
—	Deuterostomia
phylum	Chordata	Haeckel 1874
subphylum	Vertebrata
superclass	Gnathostomata
—	Osteichthyes	()
subclass	Sarcopterygii	()
subclass	Dipnotetrapodomorpha	(Nelson 2006)
subclass	Tetrapodomorpha	()
—	Tetrapoda
—	Reptiliomorpha
—	Anthracosauria

Rank	Name	Author
subclass	Amphibiosauria	Kuhn 1967
—	Cotylosauria	()
—	Amniota
subclass	Synapsida
—	Therapsida	()
infraorder	Cynodontia	()
—	Mammaliamorpha
—	Mammaliaformes
class	Mammalia
—	Allotheria	()
order	Multituberculata	Cope 1884
suborder	Cimolodonta	()
genus	Paracimexomys
species	perplexus

If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.

†Paracimexomys perplexus Eaton and Cifelli 2001

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Diagnosis

Reference	Diagnosis
J. G. Eaton and R. L. Cifelli 2001	Cusp rows of M1 diverge anteriorly as in Paracimexomys priscus. Smaller than cf. Paracimexomys robisoni and P. priscus. First molars with more external cusps than most specimens of Paracimexomys and cf. Paracimexomys (m1 - 5:3; M1 - 5:4:1). Pits present in molar valleys, more than in P. priscus but not as common or well-developed as in Cedaromys and Bryceomys. Molar cusps ribbed as in Dakotamys but unlike R priscus. Upper molar cusps lean anteriorly unlike Cedaromys and Bryceomys but as in Paracimexomys and cf. Paracimexomys. P4 (?) cusp formula 1-2:4, less than in Bryceomys (25) or Dakotamys( 3:6); high rate of cusp climb (CR= 0.51), greater than in Dakotamys and Janumys, but less than in Cedaromys.

Measurements

No measurements are available

Composition:

phosphaticsubp

Environment:

terrestrialc

Locomotion:

actively mobilec

Life habit:

arborealo

Diet:

herbivoreo

Created:

2005-09-01 17:42:57

Modified:

2005-09-01 19:42:57

Source: o = order, c = class, subp = subphylum

References: Carroll 1988, Hendy et al. 2009, Jenkins and Krause 1983, Hopson 1973

Age range: Early/Lower Cenomanian or 99.60000 to 93.50000 Ma

Collections (8 total)

Time interval	Ma	Country or state	Original ID and collection number
Late/Upper Albian - Early/Lower Cenomanian	105.3 - 93.5	USA (Idaho)	Paracimexomys perplexus (201911)
Early/Lower Cenomanian	99.6 - 93.5	USA (Utah)	Paracimexomys perplexus (14396 14398 14399 14402 type locality: 14403 14405) Paracimexomys sp. B (14407)